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

# List experiments for the project

> List experiments for the project. Includes a runs count and last-run timestamp per experiment.



## OpenAPI

````yaml GET /api/experiments
openapi: 3.1.0
info:
  title: LangWatch API
  version: 1.0.0
  description: LangWatch openapi spec
servers:
  - url: https://app.langwatch.ai
security:
  - project_api_key: []
paths:
  /api/experiments:
    get:
      summary: List experiments for the project
      description: >-
        List experiments for the project. Includes a runs count and last-run
        timestamp per experiment.
      operationId: getApiExperiments
      parameters:
        - in: query
          name: page
          required: false
          schema:
            type: integer
            default: 1
          description: 1-based page number
        - in: query
          name: pageSize
          required: false
          schema:
            type: integer
            default: 50
            maximum: 200
          description: Experiments per page, capped at 200
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: object
                properties:
                  experiments:
                    type: array
                    items:
                      type: object
                      properties:
                        id:
                          type: string
                        slug:
                          type: string
                        name:
                          type:
                            - string
                            - 'null'
                        type:
                          type: string
                        workflowId:
                          type:
                            - string
                            - 'null'
                        createdAt:
                          type: string
                        updatedAt:
                          type: string
                        runsCount:
                          type: number
                        lastRunAt:
                          type:
                            - string
                            - 'null'
                      required:
                        - id
                        - slug
                        - name
                        - type
                        - workflowId
                        - createdAt
                        - updatedAt
                        - runsCount
                        - lastRunAt
                  pagination:
                    type: object
                    properties:
                      page:
                        type: number
                      pageSize:
                        type: number
                      totalHits:
                        type: number
                      hasMore:
                        type: boolean
                    required:
                      - page
                      - pageSize
                      - totalHits
                      - hasMore
                required:
                  - experiments
                  - pagination
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
        '422':
          description: Unprocessable Entity
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
components:
  securitySchemes:
    project_api_key:
      type: apiKey
      in: header
      name: X-Auth-Token
      description: >-
        Project API key for sending traces and accessing project-scoped
        resources. Format: sk-lw-... (no underscore). Obtain one by creating a
        project via the Admin API or the LangWatch UI.

````