Free Mock API Generator – Create Fake REST Endpoints Instantly

The best mock API generator for frontend developers. Create fake REST API endpoints in seconds for testing, prototyping, and development without waiting for a backend. Features latency simulation, error testing, dynamic JSON responses, and scenario presets. A powerful JSONPlaceholder alternative.

Endpoint Configuration

Endpoint Setup
Scenario Presets
Simulation Options
0ms
0%
🎯 Conditional Responses
✅ Request Validation
🔐 Authentication
IP Restriction (Optional)

Response Body Template

🎲 Template Variables (Click to Insert)

{{uuid}}+
{{firstName}}+
{{lastName}}+
{{fullName}}+
{{email}}+
{{phone}}+
{{avatar}}+
{{username}}+
{{company}}+
{{jobTitle}}+
{{street}}+
{{city}}+
{{country}}+
{{zipCode}}+
{{isoDate}}+
{{date}}+
{{datetime}}+
{{time}}+
{{boolean}}+
{{number:N}}+
{{number:min,max}}+
{{float:min,max}}+
{{percentage}}+
{{oneOf:...}}+
{{id}}+
{{slug}}+
{{url}}+
{{sentence}}+
{{paragraph}}+
{{lorem:N}}+
{{color}}+
{{price}}+
{{creditCard}}+
{{ipAddress}}+
{{macAddress}}+
{{imageUrl}}+
➕ Add Custom Variable
Enter a single value for this variable

📡 Generated Endpoint

GET https://api.mockendpoint.dev/api/users

Generated Response

📜 Request History

No requests yet. Generate and test an endpoint to see history.

💾 My Saved Endpoints

Loading your saved endpoints...

Free Alternative to JSONPlaceholder, Mocky.io, Beeceptor & MockAPI.io

Feature Our Tool JSONPlaceholder Mocky.io Beeceptor MockAPI.io
Custom JSON Responses ✅ ❌ ✅ ✅ ✅
Dynamic Template Variables ✅ ❌ ❌ ⚠️ ✅
Latency Simulation ✅ ❌ ⚠️ ✅ ⚠️
Error Rate Simulation ✅ ❌ ❌ ✅ ❌
IP Restriction Security ✅ ❌ ❌ ❌ ❌
OpenAPI/Swagger Export ✅ ❌ ❌ ❌ ❌
No Signup Required ✅ ✅ ✅ ⚠️ ❌
Scenario Presets ✅ ❌ ❌ ❌ ❌

Mock API Features for Frontend Development

What is Mock API Generator?

A Mock API Generator creates simulated REST API endpoints that return fake but realistic data. It's essential for frontend developers who need to build and test applications before the real backend is ready. Our generator supports template variables, custom responses, and advanced simulation features.

Related tools: For simpler use cases, try our Dummy JSON API for ready-to-use endpoints, or the Dummy JSON Generator for a UI-based data generator.

✨ Key Features

  • Scenario Presets - One-click configurations for Success, Slow Network, Server Error, and Flaky API testing scenarios
  • Smart Template Variables - Use {{firstName}}, {{email}} for realistic dynamic data
  • Intelligent Latency & Error Simulation - Test loading states and error handling with configurable rates
  • Multiple HTTP Methods - Full support for GET, POST, PUT, DELETE operations
  • OpenAPI Export - Generate Swagger documentation automatically

Common Use Cases

  • Frontend development without backend
  • UI/UX prototyping with realistic data
  • Testing error handling and edge cases
  • Demo applications and presentations
  • API design and documentation
  • Load testing and performance testing

Template Variable Examples

{{uuid}} → "a1b2c3d4-e5f6-..."
{{firstName}} → "John"
{{email}} → "john.doe@example.com"
{{number:100}} → Random 0-100
{{lorem:20}} → 20 words of lorem ipsum
{{isoDate}} → "2024-01-15T10:30:00Z"

IP Restriction

  • Enable IP Restriction to limit access to specific IPs
  • Your public IP is auto-detected on page load
  • Click "Add My IP" to whitelist your current IP
  • Non-whitelisted IPs get 403 Forbidden
  • Perfect for secure API testing

🔐 Server Endpoints

Click "Create Server Endpoint" to generate a real API URL that persists on our server. Share this URL with your team or use it in your app. Server endpoints support:

  • IP restriction for security
  • Latency simulation
  • Error rate simulation
  • Template variables

Complete Guide

Learn everything about using the Mock API Generator with our comprehensive guide:

  • Step-by-step tutorials
  • Template variable reference
  • Response examples
  • IP restriction best practices
Read the Guide →

Frequently Asked Questions

What is a Mock API Generator? +
Is this tool completely free to use? +
How does IP restriction work? +
How do I generate multiple records? +
Can I see my saved endpoints after refreshing the page? +
What are template variables? +
Does this Mock API Generator use AI? +
Can I use this tool without AI? +
How do I test latency and error handling? +

📋 Quick Start Templates

Copy these templates to quickly create common API responses:

👤 User API Response

{
  "id": "{{uuid}}",
  "name": "{{firstName}} {{lastName}}",
  "email": "{{email}}",
  "avatar": "{{avatar}}",
  "createdAt": "{{isoDate}}"
}

🛍️ Product API Response

{
  "id": "{{uuid}}",
  "name": "{{product}}",
  "price": {{number:999}},
  "inStock": {{boolean}},
  "category": "{{category}}"
}

📝 Blog Post API Response

{
  "id": "{{uuid}}",
  "title": "{{sentence:6}}",
  "excerpt": "{{lorem:20}}",
  "author": "{{firstName}} {{lastName}}",
  "publishedAt": "{{isoDate}}"
}

🔐 Auth API Response

{
  "token": "{{uuid}}-{{uuid}}",
  "user": {
    "id": "{{uuid}}",
    "email": "{{email}}",
    "role": "admin"
  },
  "expiresIn": 3600
}

🔧 Related Developer Tools

🎲

Dummy JSON Generator

Generate random JSON data for testing
🔄

JSON Diff Tool

Compare two JSON responses
📋

JSON Schema Generator

Generate schema from JSON
✨

JSON Formatter

Format and validate JSON
🔔

FCM Push Tester

Test Firebase notifications
🧪

API Response Tester

Test real API endpoints
🔗

Webhook Tester

Test webhook integrations

How to Create a Fake REST API for Testing

Creating a mock API endpoint takes just 4 simple steps. No signup, no backend code, no waiting.

  1. Define Your Endpoint Path - Enter the URL path like /api/users or /api/products
  2. Choose Your HTTP Method - Select GET, POST, PUT, or DELETE depending on what you're testing
  3. Configure Your Response - Write JSON with template variables like {{firstName}}, {{email}}, {{uuid}} for dynamic data
  4. Select a Scenario Preset - Choose Success, Slow Network, Server Error, or Flaky API to simulate real-world conditions
  5. Generate & Use - Click Generate to create your endpoint and start making requests from your frontend

Common Use Cases for Mock APIs

🎨 Frontend Development

Build React, Vue, Angular, or vanilla JS applications without waiting for backend APIs. Create fake endpoints that return the exact data structure you need and iterate faster.

🧪 QA & Testing

Test edge cases, error handling, and loading states. Use scenario presets to simulate slow networks, server errors, and flaky connections your QA team needs to verify.

📱 Mobile App Development

iOS and Android developers can prototype API integrations before the backend is ready. Test offline behavior and error handling with realistic mock responses.

📚 Learning & Demos

Students and educators can use fake REST APIs to learn API integration without setting up servers. Create demo data for presentations and tutorials.

API Testing Without a Backend

Why test with mock APIs? In modern development, frontend and backend teams often work in parallel. Waiting for the backend to be completed before you can test your UI is inefficient and slows down your delivery timeline.

With a mock API generator, you can:

  • Test loading states - Use latency simulation to show spinners and skeleton screens
  • Handle errors gracefully - Simulate 400, 401, 404, and 500 errors to test your error UI
  • Generate realistic data - Dynamic template variables create believable test data
  • Prototype faster - Build features without waiting for backend implementation