OpenAPI Mock Server Builder

Generate offline mock responses from OpenAPI schemas and export handler code.

OpenAPI Input

Upload Spec

openapi: 3.0.0
info:
  title: Sample API
  version: 1.0.0
paths:
  /users:
    get:
      summary: List users
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: "#/components/schemas/User"
    post:
      summary: Create user
      responses:
        "201":
          description: Created
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/User"
  /users/{id}:
    get:
      summary: Get user
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/User"
components:
  schemas:
    User:
      type: object
      required:
        - id
        - email
      properties:
        id:
          type: string
          format: uuid
        email:
          type: string
          format: email
        name:
          type: string
        createdAt:
          type: string
          format: date-time

Depth

Optional Props

Include optional fields

Handler Format

About This Tool

Turn OpenAPI specs into offline mock responses and ready-to-use handler code for local development, demos, and test environments.