JSON Formatter & Validator
Free online JSON formatter, validator and beautifier. Pretty-print, minify, sort and validate JSON instantly in your browser.
🔒 Your JSON is processed entirely in your browser — nothing is uploaded to any server. Tip: press Ctrl+Enter to format.
Free JSON Formatter & Validator
This free online JSON formatter instantly beautifies, validates and minifies your JSON. Paste messy or minified JSON and get clean, readable, properly indented output with syntax highlighting — or catch the exact line and column where your JSON is broken. It’s fast, free, and 100% private: everything runs in your browser, so your data is never uploaded anywhere.
How to use the JSON formatter
- Paste your JSON into the left box (or click Load sample to try it out).
- Click Format / Beautify to pretty-print it with your chosen indentation.
- Use Minify to compress JSON into a single line, or Validate to just check it.
- Optionally tick Sort keys to alphabetise object keys, or change the indent to 2 spaces, 4 spaces or tabs.
- Click Copy or Download to save the result. Tip: press Ctrl+Enter to format.
What is JSON, and why format it?
JSON (JavaScript Object Notation) is the most common format for sending data between apps, APIs and configuration files. It’s built from key–value pairs, arrays and nested objects. Minified JSON (everything on one line) is great for machines but painful for humans to read or debug. A formatter adds consistent indentation and line breaks so you can scan the structure, spot missing commas or brackets, and understand nested data at a glance.
Validation matters because a single misplaced comma, unquoted key or trailing bracket makes the whole document invalid — and APIs will reject it. This tool uses your browser’s native JSON engine, so if it formats successfully, your JSON is guaranteed valid; if not, you get the precise position of the first error.