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JSON Formatter

100% Client-Side

Format, pretty-print, validate, and minify JSON strings with instant syntax error detection, line indicators, and custom indentation.

Input JSON

Indent:

Formatted Output

How to Use JSON Formatter

Paste JSON Data

Paste raw, minified, or unformatted JSON code into the editor.

Select Indentation

Choose 2 spaces, 4 spaces, tabs, or compact minification.

Format or Export

Click Format JSON, copy the structured hierarchy, or download as a .json file.

✓ Custom Spacing

Format with 2 spaces, 4 spaces, tabs, or 0-space minification.

✓ Syntax Error Pinpointing

Shows exact line, column, and token message when JSON is invalid.

✓ Client-Side Privacy

Sensitive API payloads and database dumps never leave your device.

🔒 Complete Client-Side Isolation

This tool runs entirely in your local browser runtime. No logs, analytics tracking, or remote server transmissions occur.

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