> ## Documentation Index
> Fetch the complete documentation index at: https://docs.evolutionfoundation.com.br/llms.txt
> Use this file to discover all available pages before exploring further.

# Check a user

> Check a user



## OpenAPI

````yaml /api-reference/openapi/Evolution-Go/user.yaml post /user/check
openapi: 3.0.0
info:
  title: Evolution Foundation - Evolution Go - User
  description: Go implementation of Evolution
  version: '1.0'
servers:
  - url: http://localhost:8080/
    description: Development server (HTTP)
  - url: https://localhost:8080/
    description: Development server (HTTPS)
  - url: '{customUrl}'
    description: Custom server
    variables:
      customUrl:
        default: https://your-instance.com
        description: Enter your server URL
security: []
paths:
  /user/check:
    post:
      summary: Check a user
      description: Check a user
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CheckUser'
        description: User data
      responses:
        '200':
          description: User checked successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    example: true
                  exists:
                    type: boolean
                  user:
                    type: object
              example:
                data:
                  Users:
                    - Query: +5511999999999@s.whatsapp.net
                      IsInWhatsapp: true
                      JID: 5511999999999@s.whatsapp.net
                      RemoteJID: 5511999999999@s.whatsapp.net
                      LID: 100000000000003@lid
                      VerifiedName: ''
                message: success
        '400':
          description: Bad Request - Invalid input data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                success: false
                error:
                  code: BAD_REQUEST
                  message: Invalid request data. User information is required.
                meta:
                  timestamp: '2024-01-15T10:30:00Z'
                  path: /user/check
                  method: POST
        '401':
          description: Unauthorized - Invalid or missing API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                success: false
                error:
                  code: UNAUTHORIZED
                  message: Invalid or missing API key
                meta:
                  timestamp: '2024-01-15T10:30:00Z'
                  path: /user/check
                  method: POST
        '403':
          description: Forbidden - Insufficient permissions
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                success: false
                error:
                  code: FORBIDDEN
                  message: Insufficient permissions to check user
                meta:
                  timestamp: '2024-01-15T10:30:00Z'
                  path: /user/check
                  method: POST
        '404':
          description: Not Found - User not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                success: false
                error:
                  code: NOT_FOUND
                  message: User not found
                meta:
                  timestamp: '2024-01-15T10:30:00Z'
                  path: /user/check
                  method: POST
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                success: false
                error:
                  code: INTERNAL_SERVER_ERROR
                  message: An unexpected error occurred
                meta:
                  timestamp: '2024-01-15T10:30:00Z'
                  path: /user/check
                  method: POST
components:
  schemas:
    CheckUser:
      type: object
      properties:
        number:
          items:
            type: string
          type: array
    ErrorResponse:
      type: object
      required:
        - success
        - error
      properties:
        success:
          type: boolean
          example: false
        error:
          type: object
          required:
            - code
            - message
          properties:
            code:
              type: string
            message:
              type: string
        meta:
          type: object
          properties:
            timestamp:
              type: string
              format: date-time
            path:
              type: string
            method:
              type: string

````

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