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# OpenAPI Specification
#### Version 3.0.3
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [BCP 14](https://tools.ietf.org/html/bcp14) [RFC2119](https://tools.ietf.org/html/rfc2119) [RFC8174](https://tools.ietf.org/html/rfc8174) when, and only when, they appear in all capitals, as shown here.
This document is licensed under [The Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0.html).
## Introduction
The OpenAPI Specification (OAS) defines a standard, language-agnostic interface to RESTful APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. When properly defined, a consumer can understand and interact with the remote service with a minimal amount of implementation logic.
An OpenAPI definition can then be used by documentation generation tools to display the API, code generation tools to generate servers and clients in various programming languages, testing tools, and many other use cases.
## Table of Contents
<!-- TOC depthFrom:1 depthTo:3 withLinks:1 updateOnSave:1 orderedList:0 -->
- [Definitions](#definitions)
- [OpenAPI Document](#oasDocument)
- [Path Templating](#pathTemplating)
- [Media Types](#mediaTypes)
- [HTTP Status Codes](#httpCodes)
- [Specification](#specification)
- [Versions](#versions)
- [Format](#format)
- [Document Structure](#documentStructure)
- [Data Types](#dataTypes)
- [Rich Text Formatting](#richText)
- [Relative References In URLs](#relativeReferences)
- [Schema](#schema)
- [OpenAPI Object](#oasObject)
- [Info Object](#infoObject)
- [Contact Object](#contactObject)
- [License Object](#licenseObject)
- [Server Object](#serverObject)
- [Server Variable Object](#serverVariableObject)
- [Components Object](#componentsObject)
- [Paths Object](#pathsObject)
- [Path Item Object](#pathItemObject)
- [Operation Object](#operationObject)
- [External Documentation Object](#externalDocumentationObject)
- [Parameter Object](#parameterObject)
- [Request Body Object](#requestBodyObject)
- [Media Type Object](#mediaTypeObject)
- [Encoding Object](#encodingObject)
- [Responses Object](#responsesObject)
- [Response Object](#responseObject)
- [Callback Object](#callbackObject)
- [Example Object](#exampleObject)
- [Link Object](#linkObject)
- [Header Object](#headerObject)
- [Tag Object](#tagObject)
- [Reference Object](#referenceObject)
- [Schema Object](#schemaObject)
- [Discriminator Object](#discriminatorObject)
- [XML Object](#xmlObject)
- [Security Scheme Object](#securitySchemeObject)
- [OAuth Flows Object](#oauthFlowsObject)
- [OAuth Flow Object](#oauthFlowObject)
- [Security Requirement Object](#securityRequirementObject)
- [Specification Extensions](#specificationExtensions)
- [Security Filtering](#securityFiltering)
- [Appendix A: Revision History](#revisionHistory)
<!-- /TOC -->
## Definitions
##### <a name="oasDocument"></a>OpenAPI Document
A document (or set of documents) that defines or describes an API. An OpenAPI definition uses and conforms to the OpenAPI Specification.
##### <a name="pathTemplating"></a>Path Templating
Path templating refers to the usage of template expressions, delimited by curly braces ({}), to mark a section of a URL path as replaceable using path parameters.
Each template expression in the path MUST correspond to a path parameter that is included in the [Path Item](#path-item-object) itself and/or in each of the Path Item's [Operations](#operation-object).
##### <a name="mediaTypes"></a>Media Types
Media type definitions are spread across several resources.
The media type definitions SHOULD be in compliance with [RFC6838](https://tools.ietf.org/html/rfc6838).
Some examples of possible media type definitions:
```
text/plain; charset=utf-8
application/json
application/vnd.github+json
application/vnd.github.v3+json
application/vnd.github.v3.raw+json
application/vnd.github.v3.text+json
application/vnd.github.v3.html+json
application/vnd.github.v3.full+json
application/vnd.github.v3.diff
application/vnd.github.v3.patch
```
##### <a name="httpCodes"></a>HTTP Status Codes
The HTTP Status Codes are used to indicate the status of the executed operation.
The available status codes are defined by [RFC7231](https://tools.ietf.org/html/rfc7231#section-6) and registered status codes are listed in the [IANA Status Code Registry](https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml).
## Specification
### Versions
The OpenAPI Specification is versioned using [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html) (semver) and follows the semver specification.
The `major`.`minor` portion of the semver (for example `3.0`) SHALL designate the OAS feature set. Typically, *`.patch`* versions address errors in this document, not the feature set. Tooling which supports OAS 3.0 SHOULD be compatible with all OAS 3.0.\* versions. The patch version SHOULD NOT be considered by tooling, making no distinction between `3.0.0` and `3.0.1` for example.
Each new minor version of the OpenAPI Specification SHALL allow any OpenAPI document that is valid against any previous minor version of the Specification, within the same major version, to be updated to the new Specification version with equivalent semantics. Such an update MUST only require changing the `openapi` property to the new minor version.
For example, a valid OpenAPI 3.0.2 document, upon changing its `openapi` property to `3.1.0`, SHALL be a valid OpenAPI 3.1.0 document, semantically equivalent to the original OpenAPI 3.0.2 document. New minor versions of the OpenAPI Specification MUST be written to ensure this form of backward compatibility.
An OpenAPI document compatible with OAS 3.\*.\* contains a required [`openapi`](#oasVersion) field which designates the semantic version of the OAS that it uses. (OAS 2.0 documents contain a top-level version field named [`swagger`](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#swaggerObject) and value `"2.0"`.)
### Format
An OpenAPI document that conforms to the OpenAPI Specification is itself a JSON object, which may be represented either in JSON or YAML format.
For example, if a field has an array value, the JSON array representation will be used:
```json
{
"field": [ 1, 2, 3 ]
}
```
All field names in the specification are **case sensitive**.
This includes all fields that are used as keys in a map, except where explicitly noted that keys are **case insensitive**.
The schema exposes two types of fields: Fixed fields, which have a declared name, and Patterned fields, which declare a regex pattern for the field name.
Patterned fields MUST have unique names within the containing object.
In order to preserve the ability to round-trip between YAML and JSON formats, YAML version [1.2](https://yaml.org/spec/1.2/spec.html) is RECOMMENDED along with some additional constraints:
- Tags MUST be limited to those allowed by the [JSON Schema ruleset](https://yaml.org/spec/1.2/spec.html#id2803231).
- Keys used in YAML maps MUST be limited to a scalar string, as defined by the [YAML Failsafe schema ruleset](https://yaml.org/spec/1.2/spec.html#id2802346).
**Note:** While APIs may be defined by OpenAPI documents in either YAML or JSON format, the API request and response bodies and other content are not required to be JSON or YAML.
### <a name="documentStructure"></a>Document Structure
An OpenAPI document MAY be made up of a single document or be divided into multiple, connected parts at the discretion of the user. In the latter case, `$ref` fields MUST be used in the specification to reference those parts as follows from the [JSON Schema](https://json-schema.org) definitions.
It is RECOMMENDED that the root OpenAPI document be named: `openapi.json` or `openapi.yaml`.
### <a name="dataTypes"></a>Data Types
Primitive data types in the OAS are based on the types supported by the [JSON Schema Specification Wright Draft 00](https://tools.ietf.org/html/draft-wright-json-schema-00#section-4.2).
Note that `integer` as a type is also supported and is defined as a JSON number without a fraction or exponent part.
`null` is not supported as a type (see [`nullable`](#schemaNullable) for an alternative solution).
Models are defined using the [Schema Object](#schemaObject), which is an extended subset of JSON Schema Specification Wright Draft 00.
<a name="dataTypeFormat"></a>Primitives have an optional modifier property: `format`.
OAS uses several known formats to define in fine detail the data type being used.
However, to support documentation needs, the `format` property is an open `string`-valued property, and can have any value.
Formats such as `"email"`, `"uuid"`, and so on, MAY be used even though undefined by this specification.
Types that are not accompanied by a `format` property follow the type definition in the JSON Schema. Tools that do not recognize a specific `format` MAY default back to the `type` alone, as if the `format` is not specified.
The formats defined by the OAS are:
[`type`](#dataTypes) | [`format`](#dataTypeFormat) | Comments
------ | -------- | --------
`integer` | `int32` | signed 32 bits
`integer` | `int64` | signed 64 bits (a.k.a long)
`number` | `float` | |
`number` | `double` | |
`string` | | |
`string` | `byte` | base64 encoded characters
`string` | `binary` | any sequence of octets
`boolean` | | |
`string` | `date` | As defined by `full-date` - [RFC3339](https://xml2rfc.ietf.org/public/rfc/html/rfc3339.html#anchor14)
`string` | `date-time` | As defined by `date-time` - [RFC3339](https://xml2rfc.ietf.org/public/rfc/html/rfc3339.html#anchor14)
`string` | `password` | A hint to UIs to obscure input.
### <a name="richText"></a>Rich Text Formatting
Throughout the specification `description` fields are noted as supporting CommonMark markdown formatting.
Where OpenAPI tooling renders rich text it MUST support, at a minimum, markdown syntax as described by [CommonMark 0.27](https://spec.commonmark.org/0.27/). Tooling MAY choose to ignore some CommonMark features to address security concerns.
### <a name="relativeReferences"></a>Relative References in URLs
Unless specified otherwise, all properties that are URLs MAY be relative references as defined by [RFC3986](https://tools.ietf.org/html/rfc3986#section-4.2).
Relative references are resolved using the URLs defined in the [`Server Object`](#serverObject) as a Base URI.
Relative references used in `$ref` are processed as per [JSON Reference](https://tools.ietf.org/html/draft-pbryan-zyp-json-ref-03), using the URL of the current document as the base URI. See also the [Reference Object](#referenceObject).
### Schema
In the following description, if a field is not explicitly **REQUIRED** or described with a MUST or SHALL, it can be considered OPTIONAL.
#### <a name="oasObject"></a>OpenAPI Object
This is the root document object of the [OpenAPI document](#oasDocument).
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="oasVersion"></a>openapi | `string` | **REQUIRED**. This string MUST be the [semantic version number](https://semver.org/spec/v2.0.0.html) of the [OpenAPI Specification version](#versions) that the OpenAPI document uses. The `openapi` field SHOULD be used by tooling specifications and clients to interpret the OpenAPI document. This is *not* related to the API [`info.version`](#infoVersion) string.
<a name="oasInfo"></a>info | [Info Object](#infoObject) | **REQUIRED**. Provides metadata about the API. The metadata MAY be used by tooling as required.
<a name="oasServers"></a>servers | [[Server Object](#serverObject)] | An array of Server Objects, which provide connectivity information to a target server. If the `servers` property is not provided, or is an empty array, the default value would be a [Server Object](#serverObject) with a [url](#serverUrl) value of `/`.
<a name="oasPaths"></a>paths | [Paths Object](#pathsObject) | **REQUIRED**. The available paths and operations for the API.
<a name="oasComponents"></a>components | [Components Object](#componentsObject) | An element to hold various schemas for the specification.
<a name="oasSecurity"></a>security | [[Security Requirement Object](#securityRequirementObject)] | A declaration of which security mechanisms can be used across the API. The list of values includes alternative security requirement objects that can be used. Only one of the security requirement objects need to be satisfied to authorize a request. Individual operations can override this definition. To make security optional, an empty security requirement (`{}`) can be included in the array.
<a name="oasTags"></a>tags | [[Tag Object](#tagObject)] | A list of tags used by the specification with additional metadata. The order of the tags can be used to reflect on their order by the parsing tools. Not all tags that are used by the [Operation Object](#operationObject) must be declared. The tags that are not declared MAY be organized randomly or based on the tools' logic. Each tag name in the list MUST be unique.
<a name="oasExternalDocs"></a>externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
#### <a name="infoObject"></a>Info Object
The object provides metadata about the API.
The metadata MAY be used by the clients if needed, and MAY be presented in editing or documentation generation tools for convenience.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="infoTitle"></a>title | `string` | **REQUIRED**. The title of the API.
<a name="infoDescription"></a>description | `string` | A short description of the API. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation.
<a name="infoTermsOfService"></a>termsOfService | `string` | A URL to the Terms of Service for the API. MUST be in the format of a URL.
<a name="infoContact"></a>contact | [Contact Object](#contactObject) | The contact information for the exposed API.
<a name="infoLicense"></a>license | [License Object](#licenseObject) | The license information for the exposed API.
<a name="infoVersion"></a>version | `string` | **REQUIRED**. The version of the OpenAPI document (which is distinct from the [OpenAPI Specification version](#oasVersion) or the API implementation version).
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### Info Object Example
```json
{
"title": "Sample Pet Store App",
"description": "This is a sample server for a pet store.",
"termsOfService": "http://example.com/terms/",
"contact": {
"name": "API Support",
"url": "http://www.example.com/support",
"email": "[email protected]"
},
"license": {
"name": "Apache 2.0",
"url": "https://www.apache.org/licenses/LICENSE-2.0.html"
},
"version": "1.0.1"
}
```
```yaml
title: Sample Pet Store App
description: This is a sample server for a pet store.
termsOfService: http://example.com/terms/
contact:
name: API Support
url: http://www.example.com/support
email: [email protected]
license:
name: Apache 2.0
url: https://www.apache.org/licenses/LICENSE-2.0.html
version: 1.0.1
```
#### <a name="contactObject"></a>Contact Object
Contact information for the exposed API.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="contactName"></a>name | `string` | The identifying name of the contact person/organization.
<a name="contactUrl"></a>url | `string` | The URL pointing to the contact information. MUST be in the format of a URL.
<a name="contactEmail"></a>email | `string` | The email address of the contact person/organization. MUST be in the format of an email address.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### Contact Object Example
```json
{
"name": "API Support",
"url": "http://www.example.com/support",
"email": "[email protected]"
}
```
```yaml
name: API Support
url: http://www.example.com/support
email: [email protected]
```
#### <a name="licenseObject"></a>License Object
License information for the exposed API.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="licenseName"></a>name | `string` | **REQUIRED**. The license name used for the API.
<a name="licenseUrl"></a>url | `string` | A URL to the license used for the API. MUST be in the format of a URL.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### License Object Example
```json
{
"name": "Apache 2.0",
"url": "https://www.apache.org/licenses/LICENSE-2.0.html"
}
```
```yaml
name: Apache 2.0
url: https://www.apache.org/licenses/LICENSE-2.0.html
```
#### <a name="serverObject"></a>Server Object
An object representing a Server.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="serverUrl"></a>url | `string` | **REQUIRED**. A URL to the target host. This URL supports Server Variables and MAY be relative, to indicate that the host location is relative to the location where the OpenAPI document is being served. Variable substitutions will be made when a variable is named in `{`brackets`}`.
<a name="serverDescription"></a>description | `string` | An optional string describing the host designated by the URL. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation.
<a name="serverVariables"></a>variables | Map[`string`, [Server Variable Object](#serverVariableObject)] | A map between a variable name and its value. The value is used for substitution in the server's URL template.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### Server Object Example
A single server would be described as:
```json
{
"url": "https://development.gigantic-server.com/v1",
"description": "Development server"
}
```
```yaml
url: https://development.gigantic-server.com/v1
description: Development server
```
The following shows how multiple servers can be described, for example, at the OpenAPI Object's [`servers`](#oasServers):
```json
{
"servers": [
{
"url": "https://development.gigantic-server.com/v1",
"description": "Development server"
},
{
"url": "https://staging.gigantic-server.com/v1",
"description": "Staging server"
},
{
"url": "https://api.gigantic-server.com/v1",
"description": "Production server"
}
]
}
```
```yaml
servers:
- url: https://development.gigantic-server.com/v1
description: Development server
- url: https://staging.gigantic-server.com/v1
description: Staging server
- url: https://api.gigantic-server.com/v1
description: Production server
```
The following shows how variables can be used for a server configuration:
```json
{
"servers": [
{
"url": "https://{username}.gigantic-server.com:{port}/{basePath}",
"description": "The production API server",
"variables": {
"username": {
"default": "demo",
"description": "this value is assigned by the service provider, in this example `gigantic-server.com`"
},
"port": {
"enum": [
"8443",
"443"
],
"default": "8443"
},
"basePath": {
"default": "v2"
}
}
}
]
}
```
```yaml
servers:
- url: https://{username}.gigantic-server.com:{port}/{basePath}
description: The production API server
variables:
username:
# note! no enum here means it is an open value
default: demo
description: this value is assigned by the service provider, in this example `gigantic-server.com`
port:
enum:
- '8443'
- '443'
default: '8443'
basePath:
# open meaning there is the opportunity to use special base paths as assigned by the provider, default is `v2`
default: v2
```
#### <a name="serverVariableObject"></a>Server Variable Object
An object representing a Server Variable for server URL template substitution.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="serverVariableEnum"></a>enum | [`string`] | An enumeration of string values to be used if the substitution options are from a limited set. The array SHOULD NOT be empty.
<a name="serverVariableDefault"></a>default | `string` | **REQUIRED**. The default value to use for substitution, which SHALL be sent if an alternate value is _not_ supplied. Note this behavior is different than the [Schema Object's](#schemaObject) treatment of default values, because in those cases parameter values are optional. If the [`enum`](#serverVariableEnum) is defined, the value SHOULD exist in the enum's values.
<a name="serverVariableDescription"></a>description | `string` | An optional description for the server variable. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
#### <a name="componentsObject"></a>Components Object
Holds a set of reusable objects for different aspects of the OAS.
All objects defined within the components object will have no effect on the API unless they are explicitly referenced from properties outside the components object.
##### Fixed Fields
Field Name | Type | Description
---|:---|---
<a name="componentsSchemas"></a> schemas | Map[`string`, [Schema Object](#schemaObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Schema Objects](#schemaObject).
<a name="componentsResponses"></a> responses | Map[`string`, [Response Object](#responseObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Response Objects](#responseObject).
<a name="componentsParameters"></a> parameters | Map[`string`, [Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Parameter Objects](#parameterObject).
<a name="componentsExamples"></a> examples | Map[`string`, [Example Object](#exampleObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Example Objects](#exampleObject).
<a name="componentsRequestBodies"></a> requestBodies | Map[`string`, [Request Body Object](#requestBodyObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Request Body Objects](#requestBodyObject).
<a name="componentsHeaders"></a> headers | Map[`string`, [Header Object](#headerObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Header Objects](#headerObject).
<a name="componentsSecuritySchemes"></a> securitySchemes| Map[`string`, [Security Scheme Object](#securitySchemeObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Security Scheme Objects](#securitySchemeObject).
<a name="componentsLinks"></a> links | Map[`string`, [Link Object](#linkObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Link Objects](#linkObject).
<a name="componentsCallbacks"></a> callbacks | Map[`string`, [Callback Object](#callbackObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Callback Objects](#callbackObject).
This object MAY be extended with [Specification Extensions](#specificationExtensions).
All the fixed fields declared above are objects that MUST use keys that match the regular expression: `^[a-zA-Z0-9\.\-_]+$`.
Field Name Examples:
```
User
User_1
User_Name
user-name
my.org.User
```
##### Components Object Example
```json
"components": {
"schemas": {
"GeneralError": {
"type": "object",
"properties": {
"code": {
"type": "integer",
"format": "int32"
},
"message": {
"type": "string"
}
}
},
"Category": {
"type": "object",
"properties": {
"id": {
"type": "integer",
"format": "int64"
},
"name": {
"type": "string"
}
}
},
"Tag": {
"type": "object",
"properties": {
"id": {
"type": "integer",
"format": "int64"
},
"name": {
"type": "string"
}
}
}
},
"parameters": {
"skipParam": {
"name": "skip",
"in": "query",
"description": "number of items to skip",
"required": true,
"schema": {
"type": "integer",
"format": "int32"
}
},
"limitParam": {
"name": "limit",
"in": "query",
"description": "max records to return",
"required": true,
"schema" : {
"type": "integer",
"format": "int32"
}
}
},
"responses": {
"NotFound": {
"description": "Entity not found."
},
"IllegalInput": {
"description": "Illegal input for operation."
},
"GeneralError": {
"description": "General Error",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/GeneralError"
}
}
}
}
},
"securitySchemes": {
"api_key": {
"type": "apiKey",
"name": "api_key",
"in": "header"
},
"petstore_auth": {
"type": "oauth2",
"flows": {
"implicit": {
"authorizationUrl": "http://example.org/api/oauth/dialog",
"scopes": {
"write:pets": "modify pets in your account",
"read:pets": "read your pets"
}
}
}
}
}
}
```
```yaml
components:
schemas:
GeneralError:
type: object
properties:
code:
type: integer
format: int32
message:
type: string
Category:
type: object
properties:
id:
type: integer
format: int64
name:
type: string
Tag:
type: object
properties:
id:
type: integer
format: int64
name:
type: string
parameters:
skipParam:
name: skip
in: query
description: number of items to skip
required: true
schema:
type: integer
format: int32
limitParam:
name: limit
in: query
description: max records to return
required: true
schema:
type: integer
format: int32
responses:
NotFound:
description: Entity not found.
IllegalInput:
description: Illegal input for operation.
GeneralError:
description: General Error
content:
application/json:
schema:
$ref: '#/components/schemas/GeneralError'
securitySchemes:
api_key:
type: apiKey
name: api_key
in: header
petstore_auth:
type: oauth2
flows:
implicit:
authorizationUrl: http://example.org/api/oauth/dialog
scopes:
write:pets: modify pets in your account
read:pets: read your pets
```
#### <a name="pathsObject"></a>Paths Object
Holds the relative paths to the individual endpoints and their operations.
The path is appended to the URL from the [`Server Object`](#serverObject) in order to construct the full URL. The Paths MAY be empty, due to [ACL constraints](#securityFiltering).
##### Patterned Fields
Field Pattern | Type | Description
---|:---:|---
<a name="pathsPath"></a>/{path} | [Path Item Object](#pathItemObject) | A relative path to an individual endpoint. The field name MUST begin with a forward slash (`/`). The path is **appended** (no relative URL resolution) to the expanded URL from the [`Server Object`](#serverObject)'s `url` field in order to construct the full URL. [Path templating](#pathTemplating) is allowed. When matching URLs, concrete (non-templated) paths would be matched before their templated counterparts. Templated paths with the same hierarchy but different templated names MUST NOT exist as they are identical. In case of ambiguous matching, it's up to the tooling to decide which one to use.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### Path Templating Matching
Assuming the following paths, the concrete definition, `/pets/mine`, will be matched first if used:
```
/pets/{petId}
/pets/mine
```
The following paths are considered identical and invalid:
```
/pets/{petId}
/pets/{name}
```
The following may lead to ambiguous resolution:
```
/{entity}/me
/books/{id}
```
##### Paths Object Example
```json
{
"/pets": {
"get": {
"description": "Returns all pets from the system that the user has access to",
"responses": {
"200": {
"description": "A list of pets.",
"content": {
"application/json": {
"schema": {
"type": "array",
"items": {
"$ref": "#/components/schemas/pet"
}
}
}
}
}
}
}
}
}
```
```yaml
/pets:
get:
description: Returns all pets from the system that the user has access to
responses:
'200':
description: A list of pets.
content:
application/json:
schema:
type: array
items:
$ref: '#/components/schemas/pet'
```
#### <a name="pathItemObject"></a>Path Item Object
Describes the operations available on a single path.
A Path Item MAY be empty, due to [ACL constraints](#securityFiltering).
The path itself is still exposed to the documentation viewer but they will not know which operations and parameters are available.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="pathItemRef"></a>$ref | `string` | Allows for an external definition of this path item. The referenced structure MUST be in the format of a [Path Item Object](#pathItemObject). In case a Path Item Object field appears both in the defined object and the referenced object, the behavior is undefined.
<a name="pathItemSummary"></a>summary| `string` | An optional, string summary, intended to apply to all operations in this path.
<a name="pathItemDescription"></a>description | `string` | An optional, string description, intended to apply to all operations in this path. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation.
<a name="pathItemGet"></a>get | [Operation Object](#operationObject) | A definition of a GET operation on this path.
<a name="pathItemPut"></a>put | [Operation Object](#operationObject) | A definition of a PUT operation on this path.
<a name="pathItemPost"></a>post | [Operation Object](#operationObject) | A definition of a POST operation on this path.
<a name="pathItemDelete"></a>delete | [Operation Object](#operationObject) | A definition of a DELETE operation on this path.
<a name="pathItemOptions"></a>options | [Operation Object](#operationObject) | A definition of a OPTIONS operation on this path.
<a name="pathItemHead"></a>head | [Operation Object](#operationObject) | A definition of a HEAD operation on this path.
<a name="pathItemPatch"></a>patch | [Operation Object](#operationObject) | A definition of a PATCH operation on this path.
<a name="pathItemTrace"></a>trace | [Operation Object](#operationObject) | A definition of a TRACE operation on this path.
<a name="pathItemServers"></a>servers | [[Server Object](#serverObject)] | An alternative `server` array to service all operations in this path.
<a name="pathItemParameters"></a>parameters | [[Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | A list of parameters that are applicable for all the operations described under this path. These parameters can be overridden at the operation level, but cannot be removed there. The list MUST NOT include duplicated parameters. A unique parameter is defined by a combination of a [name](#parameterName) and [location](#parameterIn). The list can use the [Reference Object](#referenceObject) to link to parameters that are defined at the [OpenAPI Object's components/parameters](#componentsParameters).
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### Path Item Object Example
```json
{
"get": {
"description": "Returns pets based on ID",
"summary": "Find pets by ID",
"operationId": "getPetsById",
"responses": {
"200": {
"description": "pet response",
"content": {
"*/*": {
"schema": {
"type": "array",
"items": {
"$ref": "#/components/schemas/Pet"
}
}
}
}
},
"default": {
"description": "error payload",
"content": {
"text/html": {
"schema": {
"$ref": "#/components/schemas/ErrorModel"
}
}
}
}
}
},
"parameters": [
{
"name": "id",
"in": "path",
"description": "ID of pet to use",
"required": true,
"schema": {
"type": "array",
"items": {
"type": "string"
}
},
"style": "simple"
}
]
}
```
```yaml
get:
description: Returns pets based on ID
summary: Find pets by ID
operationId: getPetsById
responses:
'200':
description: pet response
content:
'*/*' :
schema:
type: array
items:
$ref: '#/components/schemas/Pet'
default:
description: error payload
content:
'text/html':
schema:
$ref: '#/components/schemas/ErrorModel'
parameters:
- name: id
in: path
description: ID of pet to use
required: true
schema:
type: array
items:
type: string
style: simple
```
#### <a name="operationObject"></a>Operation Object
Describes a single API operation on a path.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="operationTags"></a>tags | [`string`] | A list of tags for API documentation control. Tags can be used for logical grouping of operations by resources or any other qualifier.
<a name="operationSummary"></a>summary | `string` | A short summary of what the operation does.
<a name="operationDescription"></a>description | `string` | A verbose explanation of the operation behavior. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation.
<a name="operationExternalDocs"></a>externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation for this operation.
<a name="operationId"></a>operationId | `string` | Unique string used to identify the operation. The id MUST be unique among all operations described in the API. The operationId value is **case-sensitive**. Tools and libraries MAY use the operationId to uniquely identify an operation, therefore, it is RECOMMENDED to follow common programming naming conventions.
<a name="operationParameters"></a>parameters | [[Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | A list of parameters that are applicable for this operation. If a parameter is already defined at the [Path Item](#pathItemParameters), the new definition will override it but can never remove it. The list MUST NOT include duplicated parameters. A unique parameter is defined by a combination of a [name](#parameterName) and [location](#parameterIn). The list can use the [Reference Object](#referenceObject) to link to parameters that are defined at the [OpenAPI Object's components/parameters](#componentsParameters).
<a name="operationRequestBody"></a>requestBody | [Request Body Object](#requestBodyObject) \| [Reference Object](#referenceObject) | The request body applicable for this operation. The `requestBody` is only supported in HTTP methods where the HTTP 1.1 specification [RFC7231](https://tools.ietf.org/html/rfc7231#section-4.3.1) has explicitly defined semantics for request bodies. In other cases where the HTTP spec is vague, `requestBody` SHALL be ignored by consumers.
<a name="operationResponses"></a>responses | [Responses Object](#responsesObject) | **REQUIRED**. The list of possible responses as they are returned from executing this operation.
<a name="operationCallbacks"></a>callbacks | Map[`string`, [Callback Object](#callbackObject) \| [Reference Object](#referenceObject)] | A map of possible out-of band callbacks related to the parent operation. The key is a unique identifier for the Callback Object. Each value in the map is a [Callback Object](#callbackObject) that describes a request that may be initiated by the API provider and the expected responses.
<a name="operationDeprecated"></a>deprecated | `boolean` | Declares this operation to be deprecated. Consumers SHOULD refrain from usage of the declared operation. Default value is `false`.
<a name="operationSecurity"></a>security | [[Security Requirement Object](#securityRequirementObject)] | A declaration of which security mechanisms can be used for this operation. The list of values includes alternative security requirement objects that can be used. Only one of the security requirement objects need to be satisfied to authorize a request. To make security optional, an empty security requirement (`{}`) can be included in the array. This definition overrides any declared top-level [`security`](#oasSecurity). To remove a top-level security declaration, an empty array can be used.
<a name="operationServers"></a>servers | [[Server Object](#serverObject)] | An alternative `server` array to service this operation. If an alternative `server` object is specified at the Path Item Object or Root level, it will be overridden by this value.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### Operation Object Example
```json
{
"tags": [
"pet"
],
"summary": "Updates a pet in the store with form data",
"operationId": "updatePetWithForm",
"parameters": [
{
"name": "petId",
"in": "path",
"description": "ID of pet that needs to be updated",
"required": true,
"schema": {
"type": "string"
}
}
],
"requestBody": {
"content": {
"application/x-www-form-urlencoded": {
"schema": {
"type": "object",
"properties": {
"name": {
"description": "Updated name of the pet",
"type": "string"
},
"status": {
"description": "Updated status of the pet",
"type": "string"
}
},
"required": ["status"]
}
}
}
},
"responses": {
"200": {
"description": "Pet updated.",
"content": {
"application/json": {},
"application/xml": {}
}
},
"405": {
"description": "Method Not Allowed",
"content": {
"application/json": {},
"application/xml": {}
}
}
},
"security": [
{
"petstore_auth": [
"write:pets",
"read:pets"
]
}
]
}
```
```yaml
tags:
- pet
summary: Updates a pet in the store with form data
operationId: updatePetWithForm
parameters:
- name: petId
in: path
description: ID of pet that needs to be updated
required: true
schema:
type: string
requestBody:
content:
'application/x-www-form-urlencoded':
schema:
properties:
name:
description: Updated name of the pet
type: string
status:
description: Updated status of the pet
type: string
required:
- status
responses:
'200':
description: Pet updated.
content:
'application/json': {}
'application/xml': {}
'405':
description: Method Not Allowed
content:
'application/json': {}
'application/xml': {}
security:
- petstore_auth:
- write:pets
- read:pets
```
#### <a name="externalDocumentationObject"></a>External Documentation Object
Allows referencing an external resource for extended documentation.
##### Fixed Fields
Field Name | Type | Description
---|:---:|---
<a name="externalDocDescription"></a>description | `string` | A short description of the target documentation. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation.
<a name="externalDocUrl"></a>url | `string` | **REQUIRED**. The URL for the target documentation. Value MUST be in the format of a URL.
This object MAY be extended with [Specification Extensions](#specificationExtensions).
##### External Documentation Object Example
```json
{
"description": "Find more info here",
"url": "https://example.com"
}
```
```yaml
description: Find more info here
url: https://example.com
```
#### <a name="parameterObject"></a>Parameter Object