JSON Formatter

JSON (JavaScript Object Notation) is the standard format APIs use to exchange data — it's what you get back from most web services, configuration files, and app export/import features. Raw JSON from an API response or a minified config file is often crammed onto a single line, which makes it nearly impossible to read or debug. This tool expands ("beautifies") that JSON into a readable, indented structure, or does the reverse — minifying nicely-formatted JSON down to save space before sending it over a network.

Common uses

• Debugging API responses — paste a raw response to see it structured and catch syntax errors instantly.
• Editing config files — package.json, tsconfig.json, and similar files are easier to review when formatted.
• Minifying before deployment — strip whitespace to reduce payload size.

Frequently asked questions

Is my JSON data uploaded anywhere? No — validation and formatting run entirely client-side using the browser's built-in JSON.parse/JSON.stringify, so nothing you paste ever leaves your device. This makes it safe to use with sensitive API keys or internal data.

What happens if my JSON is invalid? The status bar shows exactly what's wrong (e.g. a missing comma or unclosed bracket) as you type.