JSON Formatter

How to use the free JSON formatter

1. Paste your JSON — drop in the minified or messy string straight from an API response, log, or config file.
2. Format or minify — click "Format / Beautify" to add clean indentation, or "Minify" to compress everything onto one line for production.
3. Catch errors instantly — if a bracket, quote, or comma is wrong, the tool flags it so you fix it before it breaks something downstream.

Format vs. minify — two opposite jobs

Formatting expands JSON with indentation and line breaks so a human can actually read the structure while developing or debugging. Minifying does the reverse: it strips every unnecessary space and newline so the payload travels as few bytes as possible in production. The rule of thumb is simple — format while you work, minify what you ship.

When this tool earns its keep

• Reading an API response copied from the browser's network tab or a curl command.
• Hunting a syntax error — a trailing comma or an unquoted key that quietly breaks parsing.
• Comparing two payloads by beautifying both so the differences line up cleanly.
• Tidying a config file before committing so the formatting stays consistent across the team.

Frequently asked questions

Is my JSON sent to a server?
No. Everything runs locally in your browser using JavaScript, so the text you paste never leaves your device — safe even for payloads containing API tokens or personal data.

Why does it say my JSON is invalid?
Usually one of three things: a trailing comma after the last item, single quotes where JSON requires double quotes, or an unclosed bracket. JSON is stricter than JavaScript object literals, so habits from JS can trip you up.

Can it handle large files?
It comfortably handles sizeable payloads; very large files (many megabytes) depend on your browser's available memory, in which case formatting a representative slice is usually enough to debug.