Microsoft Graph API

openapi: 3.1.0
info:
  title: Microsoft Graph API (v1.0)
  description: >-
    Unified Microsoft Graph REST API for accessing Microsoft 365, Entra ID
    (Azure AD), Outlook, OneDrive, Teams, Planner, and other services. All
    requests target the `https://graph.microsoft.com/v1.0` endpoint and use
    OAuth 2.0 (Microsoft identity platform) bearer tokens for authentication.
  version: 1.0.0
  contact:
    name: Microsoft Graph
    url: https://developer.microsoft.com/graph
  x-generated-from: https://learn.microsoft.com/en-us/graph/api/overview?view=graph-rest-1.0
  x-generated-by: claude-crawl-2026-05-08
servers:
  - url: https://graph.microsoft.com/v1.0
    description: Microsoft Graph v1.0 production endpoint
security:
  - oauth2: []
tags:
  - name: Users
    description: User accounts and profiles in Microsoft Entra ID.
  - name: Me
    description: Operations on the signed-in user.
  - name: Groups
    description: Microsoft 365 groups and security groups.
  - name: Mail
    description: Outlook mail messages for the signed-in user.
  - name: Calendar
    description: Outlook calendar events for the signed-in user.
paths:
  /users:
    get:
      tags: [Users]
      operationId: listUsers
      summary: List users in the directory
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Collection'
  /users/{userId}:
    get:
      tags: [Users]
      operationId: getUser
      summary: Get a user by id or userPrincipalName
      parameters:
        - $ref: '#/components/parameters/UserId'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Resource'
  /me:
    get:
      tags: [Me]
      operationId: getMe
      summary: Get the profile of the signed-in user
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Resource'
  /me/messages:
    get:
      tags: [Mail]
      operationId: listMyMessages
      summary: List the signed-in user's Outlook messages
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Collection'
  /me/events:
    get:
      tags: [Calendar]
      operationId: listMyEvents
      summary: List the signed-in user's calendar events
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Collection'
  /me/calendar:
    get:
      tags: [Calendar]
      operationId: getMyCalendar
      summary: Get the signed-in user's default calendar
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Resource'
  /groups:
    get:
      tags: [Groups]
      operationId: listGroups
      summary: List groups in the directory
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Collection'
  /groups/{groupId}:
    get:
      tags: [Groups]
      operationId: getGroup
      summary: Get a group by id
      parameters:
        - $ref: '#/components/parameters/GroupId'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Resource'
  /groups/{groupId}/members:
    get:
      tags: [Groups]
      operationId: listGroupMembers
      summary: List members of a group
      parameters:
        - $ref: '#/components/parameters/GroupId'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Collection'
components:
  securitySchemes:
    oauth2:
      type: oauth2
      description: >-
        Microsoft identity platform OAuth 2.0. Acquire access tokens from
        https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token and
        send as `Authorization: Bearer <token>`.
      flows:
        authorizationCode:
          authorizationUrl: https://login.microsoftonline.com/common/oauth2/v2.0/authorize
          tokenUrl: https://login.microsoftonline.com/common/oauth2/v2.0/token
          scopes:
            'https://graph.microsoft.com/.default': Default app permissions
        clientCredentials:
          tokenUrl: https://login.microsoftonline.com/common/oauth2/v2.0/token
          scopes:
            'https://graph.microsoft.com/.default': Default app permissions
  parameters:
    UserId:
      name: userId
      in: path
      required: true
      schema:
        type: string
      description: User id (object id) or userPrincipalName.
    GroupId:
      name: groupId
      in: path
      required: true
      schema:
        type: string
      description: Group id.
  schemas:
    Resource:
      type: object
      additionalProperties: true
    Collection:
      type: object
      additionalProperties: true
      properties:
        value:
          type: array
          items:
            $ref: '#/components/schemas/Resource'
        '@odata.nextLink':
          type: string