About JSON Tools

JSON Tools is a free collection of JSON utilities built for developers who need to work with JSON quickly and without friction. Every tool runs entirely in your browser — nothing is uploaded, nothing is logged, and no account is ever required.

The project exists because developer tools should respect your data. Pasting a JWT token, a production API response, or a config file into a random website is risky. JSON Tools processes everything locally, so your payloads stay on your machine.

JSON Tools is built and maintained by Ashish Kumar, as part of the Renderlog family of free browser-based tools.

What JSON Tools can do

• Format and beautify JSON with configurable indentation
• Validate JSON and report exact line and column errors
• Diff two JSON documents and highlight added, removed, and changed values
• Repair broken or malformed JSON automatically
• Convert JSON to TypeScript interfaces, CSV, YAML, and more
• Query JSON with JSONPath expressions
• Decode and inspect JWT tokens (header, payload, signature)
• Generate JSON Schema from any JSON object
• Flatten and unflatten nested JSON structures
• Minify JSON for production and storage

Privacy by design

All processing happens locally using JavaScript in your browser. JSON payloads, JWT tokens, and API responses you paste into these tools are never transmitted to any server. We have no ability to read your data.