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OpenAPI mock data generator

Generate seeded, schema-valid example requests and responses from an OpenAPI document and download them as test fixtures.

OpenAPI document

openapi: 3.0.3
info:
  title: Orders API
  version: 1.4.0
paths:
  /orders:
    get:
      operationId: listOrders
      summary: List orders
      parameters:
        - name: limit
          in: query
          schema:
            type: integer
            minimum: 1
            maximum: 100
        - name: status
          in: query
          schema:
            type: string
            enum: [open, shipped, cancelled]
      responses:
        "200":
          description: A page of orders
          content:
            application/json:
              schema:
                type: object
                required: [total, orders]
                properties:
                  total:
                    type: integer
                  orders:
                    type: array
                    items:
                      $ref: "#/components/schemas/Order"
    post:
      operationId: createOrder
      summary: Create an order
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/OrderInput"
      responses:
        "201":
          description: Created
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Order"
        "400":
          description: Bad request
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
  /orders/{orderId}:
    get:
      operationId: getOrder
      summary: Fetch one order
      parameters:
        - name: orderId
          in: path
          required: true
          schema:
            type: string
            format: uuid
      responses:
        "200":
          description: The order
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Order"
components:
  schemas:
    Order:
      type: object
      required: [id, createdAt, items]
      properties:
        id:
          type: string
          format: uuid
        createdAt:
          type: string
          format: date-time
        status:
          type: string
          enum: [open, shipped, cancelled]
        email:
          type: string
          format: email
        items:
          type: array
          items:
            $ref: "#/components/schemas/OrderItem"
    OrderItem:
      type: object
      required: [sku, quantity]
      properties:
        sku:
          type: string
          pattern: "^[A-Z]{3}-\\d{4}$"
        quantity:
          type: integer
          minimum: 1
        price:
          type: number
          minimum: 0
          exclusiveMinimum: true
    OrderInput:
      type: object
      required: [email, items]
      properties:
        email:
          type: string
          format: email
        items:
          type: array
          minItems: 1
          items:
            $ref: "#/components/schemas/OrderItem"

Mocks

Paste a document to generate mocks.

Everything runs in this tab; the document is not uploaded. The tool reads OpenAPI 2.0, 3.0 and 3.1 in JSON or YAML and resolves only local #/ references: remote and file references are reported, not fetched. Validation covers required properties, enums, const, numeric bounds and multiples, string lengths, patterns and common formats; it is not a full JSON Schema checker. Determinism holds per engine version, not forever: the same document, options and seed give the same bytes for this version, so pin the downloaded fixtures file rather than the seed.

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