Does this OpenAPI mock server generator upload my file?

No. Parsing and generation run locally in the current browser tab. The page does not send the pasted or uploaded OpenAPI document to a third-party service.

Which OpenAPI versions are supported?

The generator accepts OpenAPI 3.x documents in JSON or common YAML syntax. It reports a clear validation message for other document shapes.

You can download a self-contained Node mock server and a JSON Server-style fixture generated from the parsed routes and example responses.

OpenAPI tooling · Variant 2

OpenAPI Mock Server Generator

Paste or upload an OpenAPI 3 JSON or YAML document. Inspect every route, method, response status, and example, then copy request snippets or download a local mock fixture.

Generate mock routes How it works

Runs locally: Your OpenAPI input stays in this browser tab. No pasted text or uploaded file is sent to Quick Test Hub or another third party.

GETPOST200MOCK

API

Routes at a glance

Methods, statuses, examples, cURL, and fetch in one local view.

Local parser and generator

Turn an OpenAPI document into a mock-ready route map.

Supports common OpenAPI 3 JSON and YAML documents. Large inputs are capped in the browser to keep the page responsive.

OpenAPI JSON or YAML

openapi: 3.0.3
info:
  title: Pet Store API
  version: 1.0.0
servers:
  - url: https://api.example.com/v1
paths:
  /pets:
    get:
      summary: List pets
      responses:
        '200':
          description: A list of pets
          content:
            application/json:
              example:
                - id: 1
                  name: Luna
                  status: available
    post:
      summary: Create a pet
      requestBody:
        content:
          application/json:
            example:
              name: Milo
              status: available
      responses:
        '201':
          description: Pet created
          content:
            application/json:
              example:
                id: 2
                name: Milo
                status: available
  /pets/{petId}:
    get:
      summary: Get a pet
      responses:
        '200':
          description: One pet
          content:
            application/json:
              example:
                id: 1
                name: Luna
        '404':
          description: Pet not found
          content:
            application/json:
              example:
                message: Pet not found

Or upload a .json, .yaml, or .yml fileFile contents are read locally and never uploaded.

Ready. Paste a document or use the sample.

Route inventoryREADY

Parse a document to see routes, methods, statuses, and examples.

Generated artifacts

From route discovery to a local mock.

Use the generated snippets for quick manual checks, or download a starter fixture for local development and contract tests.

OpenAPI 3 parsing

Reads paths, HTTP methods, response statuses, request examples, response examples, and the first server URL.

cURL and fetch

Select any parsed route to get a copyable request example with the correct method, URL, headers, and body.

Node mock server

Download a dependency-free mock-server.js that serves the parsed examples on localhost:3000.

JSON Server fixture

Download a JSON fixture for teams that prefer a quick JSON Server-style local data source.

What is an OpenAPI mock server generator?

An OpenAPI mock server generator turns an API description into predictable local responses. It is useful when the real backend is unavailable, when a frontend needs stable fixtures, or when a QA team wants to exercise routes before deployment.

How to use this OpenAPI mock server generator

Paste an OpenAPI 3 JSON or YAML document, or choose a local file.
Parse the document and review every route, method, response status, and example.
Select a route to copy cURL or fetch, then download a Node mock server or JSON fixture.
Review generated examples against the real contract and add scenario-specific data before relying on them in tests.

OpenAPI mock server limitations

This lightweight browser tool focuses on route discovery and example responses. It does not resolve remote references, validate every JSON Schema keyword, implement authentication, or simulate latency and state transitions. For release gates, pair it with API contract testing and API integration testing.

OpenAPI mock server generator FAQ

Does the generator upload OpenAPI input?

No. Parsing, rendering, and downloads happen locally. Do not paste secrets or proprietary documents into any browser tool unless your organization permits it.

Can I use YAML?

Yes. Common OpenAPI 3 YAML structures, including nested paths, methods, responses, content, and examples, are parsed in the current tab.

Is the downloaded mock production-ready?

No. Treat it as a local development and test fixture. Add authentication, validation, persistence, observability, and realistic failure behavior before using a mock in a wider workflow.