JTA
Live API Generator

Mock API Playground

Generate realistic REST APIs instantly for testing and development. No backend required.

Instant Setup
24hr Expiry
Free Forever
GET

Response Preview

Generate an API to see the response preview

Instant Generation

Create mock REST APIs in seconds without any backend setup or configuration.

Realistic Data

Generate realistic mock data based on your JSON schema for accurate testing.

24 Hour Access

Your generated API stays live for 24 hours, perfect for development and testing.

Live Mock API Generator

Instantly generate fully functional mock REST APIs with custom endpoints and dynamic responses. Perfect for frontend development, testing, prototyping, and API simulations.

What is the Live Mock API Generator?

The Live Mock API Generator enables developers to quickly create and deploy mock REST APIs without backend dependencies. You can define custom endpoints, configure request methods, simulate authentication, and return dynamic or static JSON responses — all in seconds. It’s ideal for frontend development, QA testing, demos, and rapid prototyping.

Rapid API Creation

Create fully functional endpoints instantly so development can begin without waiting for backend implementation.

Flexible & Dynamic Responses

Define static or dynamic JSON data, configure status codes, add custom headers, and simulate response delays for real-world testing scenarios.

No Backend Required

Build and test frontend features independently, enabling parallel development across teams.

Why Choose the Live Mock API Generator?

1

Speed Up Frontend Development

Start building and testing UI components immediately, even when backend services are unavailable or incomplete.

2

Improve Testing & QA Coverage

Simulate success responses, errors, edge cases, and slow network conditions to ensure application reliability.

3

Accelerate Prototyping

Quickly demonstrate features to clients or stakeholders without relying on production systems.

4

Enhance Team Collaboration

Enable designers, developers, and QA teams to work in parallel using consistent and predictable mock data.

When Should You Use It?

1

Backend Still in Development

Continue frontend progress while backend APIs are being built or updated.

2

Testing Edge Cases

Simulate failures, delayed responses, invalid payloads, and unusual formats to test resilience.

3

Client Demos & Hackathons

Create temporary APIs for presentations, proof-of-concepts, and rapid experimentation.

4

Learning & Experimentation

Practice API integration, test libraries like Axios or Fetch, and experiment with different data models.

How to Use the Live Mock API Generator

1

Define Your Endpoint

Specify the endpoint path, choose the HTTP method (GET, POST, PUT, DELETE), and optionally configure headers or query parameters. 

Endpoint: /users
Method: GET
Headers: { "Authorization": "Bearer token" }
2

Provide your JSON response, set HTTP status codes, add custom headers, and simulate response delays to mimic real-world conditions.

The tool automatically generates a TypeScript interface in the right panel. It detects types, handles nested objects, and creates proper interface names. 

{
  "users": [
    { "id": 1, "name": "John Doe", "email": "john@example.com" },
    { "id": 2, "name": "Jane Doe", "email": "jane@example.com" }
  ]
}
3

Generate & Test

Click "Generate" to launch your mock API and use the provided URL in Postman, frontend apps, or automated tests.

Pro Tips

  • •Use dynamic templates to generate random IDs, names, timestamps, or realistic test data.
  • •Combine multiple endpoints to simulate a complete backend service.
  • •Add response delays to test loading states and timeout handling.
  • •Export and reuse configurations across projects or teams.
  • •Integrate seamlessly with Angular, React, Vue, or any frontend framework.
  • •Simulate authentication flows by configuring headers and custom status responses.

Frequently Asked Questions

Everything you need to know about JSONtoAll tools.

Is my JSON data safe and private?
Absolutely! All conversion happens entirely in your browser using JavaScript. Your JSON data never leaves your device or gets sent to our servers. You can even use this tool offline once the page loads.
Can I use this for large JSON files?
Yes! The tool can handle large and complex JSON structures. However, extremely large files (10MB+) might slow down your browser since all processing happens client-side. For best performance, use files under 5MB.
Does it work with nested JSON objects?
Yes! The converter automatically handles nested objects of any depth and creates separate interfaces for each nested structure. It also properly detects arrays and optional properties.
Can I customize the interface names?
The tool generates sensible interface names automatically based on your JSON structure. After copying the generated code, you can easily rename interfaces in your IDE to match your project's naming conventions.
What frameworks is this compatible with?
The generated TypeScript interfaces work with any TypeScript-based framework including Angular, React, Vue, Next.js, NestJS, and more. It's pure TypeScript syntax with no framework-specific code.
Do I need to install anything?
No installation required! This is a browser-based tool that works instantly. Just visit the page, paste your JSON, and get your TypeScript interfaces. No downloads, no setup, no configuration needed.
Can I fetch JSON from an API directly?
Yes! Use the "Fetch JSON" feature at the top of the page. Simply enter any public API endpoint URL, and the tool will fetch the JSON and automatically generate TypeScript interfaces from the response.

Ready to Generate Your Mock API?

Create realistic REST APIs instantly for testing and development. No backend setup required. Generate live endpoints with custom JSON data in seconds.