No backend needed. Upload your JSON file and get a working REST API for testing, prototyping, and demos. Perfect for frontend developers.
Upload your JSON file and get a REST API in seconds
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Quick Start
Structure your JSON data and each top-level property becomes a REST endpoint
{
"posts": [
{
"id": "1",
"title": "Hello World",
"views": 100
},
{
"id": "2",
"title": "JSON API Server",
"views": 200
}
],
"comments": [
{
"id": "1",
"text": "Great post!",
"postId": "1"
}
],
"profile": {
"name": "John Doe"
}
}/posts Get all posts
/posts/1 Get post by ID
/comments Get all comments
/profile Get profile object
How It Works
Deploy a working API in under 2 minutes
Structure your data
Create a db.json or db.json5 file with your data structure. Define resources like posts, users, or comments. Each top-level key becomes an API endpoint.
Instant API generation
Drag and drop your JSON file. Get a live API URL immediately. Your JSON structure automatically becomes REST endpoints with full CRUD support.
Test and iterate
Use GET requests with filters, pagination, and sorting. Share the API with your team. Update your JSON anytime to change the data.
Powerful Queries
Full query support just like a real REST API
Filter with comparison operators
/posts?views_gt=100
Supports: _lt, _lte, _gt, _gte, _ne
Page through results easily
/posts?_page=1&_per_page=10
Default: 10 items per page
Sort by any field, ascending or descending
/posts?_sort=id,-views
Use - prefix for descending
Get a specific range of items
/posts?_start=0&_limit=5
Perfect for infinite scroll
Query nested object properties
/posts?author.name=John
Access deep properties with dot notation
Filter by array element values
/posts?tags[0]=javascript
Access array items by index
Benefits
Build faster, test easier, prototype better
Upload a JSON file and get a working REST API immediately. No server setup, no backend code, no configuration. Perfect for prototyping and testing your frontend.
Frontend developers can build and test without waiting for backend APIs. Mock data becomes a real API in seconds, letting you focus on what matters.
Create realistic API responses for testing, demos, or learning. Great for tutorials, coding bootcamps, or showcasing your frontend work to clients.
Query your JSON API with filters, pagination, sorting, and nested field access. All the features you need for realistic API testing without the complexity.
Change your JSON data on the fly. Upload a new version and your API updates instantly. Perfect for iterating on mock data during development.
Give everyone the same API endpoint. No more 'works on my machine' issues. Your whole team works with consistent mock data and API responses.
Perfect For
Build your React, Vue, or Angular app without waiting for the backend team. Create realistic API responses and test your data fetching logic.
Example: Todo app, blog frontend, dashboard with charts
Show clients working prototypes with realistic data. Demo your app to stakeholders without building a full backend infrastructure.
Example: Client presentations, investor demos, proof of concepts
Teaching API concepts? Let students focus on frontend skills without server setup. Perfect for coding bootcamps and online courses.
Example: JavaScript courses, React tutorials, API workshops
Test your frontend against different API responses. Create edge cases, error scenarios, and various data structures without backend changes.
Example: E2E tests, integration tests, load testing
FAQ
A JSON API server serves your JSON data as a REST API. It converts a simple JSON file into endpoints you can query with GET requests, making it perfect for frontend testing and prototyping without building a real backend.
Yes! Upload your JSON file and get a working REST API for free. No credit card, no trial period. Perfect for development, testing, demos, and learning. Premium features like custom domains are optional.
Currently supports GET requests with full query capabilities including filters (field_gt, field_lt, etc.), pagination (_page, _per_page), sorting (_sort), range queries (_start, _end), and nested field access. Perfect for realistic API testing.
This is designed for development, testing, prototyping, and demos. For production apps with real users, we recommend using a proper database and backend. But for MVPs, proofs of concept, and client demos, it works great.
Use a db.json file where each top-level property is a resource. For example: {"posts": [{"id": 1, "title": "Hello"}], "users": [{"id": 1, "name": "John"}]}. Each resource becomes an API endpoint like /posts and /users.
JSON5 is more flexible than regular JSON. It allows comments, trailing commas, unquoted keys, and single quotes. Both work perfectly - use JSON5 if you want a more readable format with comments for your mock data.
Absolutely! Upload a new version of your JSON file anytime and the API updates instantly. Your API endpoint URL stays the same, making it easy to iterate on your mock data during development.
Similar functionality but hosted for you. No npm install, no running local servers, no port conflicts. Just upload and share the URL with your team. Everyone gets the same API without local setup.
No account required to start. Just drop your file, claim your link, and share your work with the world instantly.