Mock JSON APIs
in seconds
Create instant JSON endpoints for testing.
Instant, zero-config REST endpoints for modern frontend development.
A Powerful Backend for Your Application
Manage data storage bins effortlessly and sync structured JSON payloads directly to your live application interface in real-time.
* Edit keys like totalRequests or endpoint to update the screen live.
Powerful JSON tools
All tools run 100% in your browser. Your data never leaves your machine.
JSON to CSV →
Convert JSON data to CSV format instantly
JSON to TypeScript →
Generate TypeScript interfaces or types from JSON
YAML to JSON →
Convert between YAML and JSON formats
JSON to Query String →
Convert JSON objects to URL query strings
JSON Formatter →
Pretty print, validate, sort, and minify JSON
JSON Minifier →
Compress JSON by removing whitespace and comments
JSON Tree Viewer →
Visualize JSON as collapsible tree with search
JSONPath Tester →
Test JSONPath queries with filters and wildcards
JSON Diff →
Compare two JSON objects side-by-side
JSON Schema →
Generate JSON Schema (Draft 2020-12, 2019-09, 07)
JSON to Go →
Generate Go structs with JSON tags
JSON to Python →
Generate Pydantic models, dataclasses, or TypedDict
JSON to C# →
Generate C# classes with JSON attributes
JSON to Java →
Generate Java POJOs with Jackson/Lombok annotations
Engineered for Frontend Developers
Everything you need to mock APIs, store payloads, and transform JSON data instantly.
Instant Mock APIs
Eliminate backend bottlenecks by creating a live mock JSON API in seconds. Perfect for prototyping React, Vue, or mobile apps without server management.
Persistent Edge Storage
Go beyond static placeholders with a full-featured mock server backed by Cloudflare's global edge network, D1 SQLite, and R2 storage.
15+ Client-Side Tools
Format, validate, diff, query with JSONPath, or convert data to TypeScript, Go, Python, and CSV entirely in your browser—your data never leaves your machine.
Free & Pro Tiers
Start free with 10 bins, 1,000 daily requests, and 7-day retention. Upgrade to Pro for $9/month to unlock private bins, permanent storage, and full write access.
Frequently asked questions
Yes, the Free plan includes 10 public bins, 100 KB storage per bin, 1,000 requests/day, and 7-day retention — no credit card required.
Private bins are available on the Pro plan ($9/month). They require a bearer token for secure access.
Yes. Pro includes higher limits, private bins, full write access (POST, PUT, DELETE), permanent retention, and 100 version history.
All tools run 100% in your browser. Your data never leaves your machine — no uploads or server processing.
A mock JSON API simulates a real REST API by returning predefined JSON responses. It lets frontend developers build and test applications without a backend server.
Yes. Create instant endpoints, test with realistic JSON data, use the built-in JSON tools to format, validate, convert, and compare responses — all without deploying a backend.
Yes. The JSON Schema Generator tool creates JSON Schema from your JSON data, and you can validate payloads against schemas using the JSON Validator tool.