Best Free Online JSON Editor, Formatter, Validator & Free JSON Mock API (GET/POST)
Welcome to the best free online JSON editor and free JSON mock API generator. ShareDoc JSON empowers software developers, QA engineers, and data analysts to format, inspect, validate, convert, and mock JSON payloads seamlessly in the browser.
Comprehensive Online JSON Tools & Features
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Free Online GET & POST Mock API Server: Turn your JSON schema or response payload into an instant live mock REST API endpoint. Test client-side web, iOS, and Android apps with realistic GET, POST, PUT, DELETE, and PATCH requests. Customize status codes (200 OK, 201 Created, 400 Bad Request, 404 Not Found, 500 Internal Error) and simulate real-world network latency.
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Online JSON Formatter & Beautifier: Format messy, compressed, or minified JSON with standard 2-space or 4-space indentation for clean readability.
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Real-Time JSON Syntax Validator: Detect missing commas, unmatched curly braces, trailing commas, and invalid quotes with exact line and column numbers.
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Interactive JSON Tree Viewer: Visually navigate nested objects and complex arrays with collapsible tree nodes, key search, and type indicators.
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XML to JSON & JSON to XML Converter: Fast, bi-directional conversion with support for XML attributes, namespaces, and arrays.
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TypeScript, Go & Python Type Generator: Automatically extract TypeScript interfaces, Go structs, and Python Pydantic models from your JSON.
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Data Sanitizer & Secret Masking: One-click sanitization to mask authorization tokens, JWTs, passwords, and sensitive credentials before sharing.
How to Create a Free Online Mock API in 3 Steps
- Step 1: Paste your JSON: Enter your JSON response data into the editor.
- Step 2: Open Mock API: Click the "Mock API" button in the navigation header.
- Step 3: Copy Endpoint: Use your generated live URL (e.g.
https://sharedoc.dev/mock/a8b2k9) in fetch, axios, curl, or Postman to test GET and POST requests instantly.
Why Developers Choose ShareDoc JSON Editor
Unlike traditional static JSON linters, ShareDoc combines real-time multi-user live collaboration, instant mock REST APIs, type generation, and 15-day privacy-safe sharing into a single fast, modern interface.
Please enable JavaScript in your browser to launch the live interactive JSON editor and Mock API builder.