More JSON Tools
Continue working with your formatted data using related browser-based JSON tools.
AI JSON Fixer
Repair malformed AI-generated JSON from ChatGPT, Claude and APIs.
Fix JSON ↗Opens sister site llmjsonfixer.comFree Online JSON Formatter, Validator and Beautifier
This free JSON formatter helps developers beautify compact JSON, validate JSON syntax, and minify JSON for production. It is built for API responses, AI-generated JSON, configuration files and debugging. All formatting runs locally in your browser — your data is never uploaded.
- Beautify and pretty-print minified or compact JSON
- Validate JSON syntax and catch parser errors instantly
- Minify JSON to reduce payload size for APIs
- Format JSON from ChatGPT, Claude, Gemini and other LLMs
- Copy formatted JSON with one click — no signup required
Frequently Asked Questions
How do I beautify JSON online for free?
Paste compact or minified JSON into the input box and click Format JSON. The tool pretty-prints it with proper indentation instantly in your browser.
How do I validate JSON and find syntax errors?
The formatter validates JSON as it parses. If the JSON is invalid it reports the parser error so you can locate trailing commas, missing brackets or invalid quotes.
How do I minify JSON for production APIs?
Click Minify to compress formatted JSON into a single line, removing whitespace to reduce payload size for API requests and responses.
Is this JSON formatter safe and private?
Yes. All JSON formatting, validation and minification happens locally in your browser. Your JSON data is never uploaded or stored.