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JSON Formatter

Free

Paste raw or minified JSON and get a beautifully formatted, indented output instantly. Detects syntax errors with clear line-number hints. Runs entirely in your browser — nothing is sent to a server.

Indent:

How to Use JSON Formatter

  1. 1

    Paste your raw or minified JSON into the input panel on the left. Keyboard shortcut: Ctrl+V (Cmd+V on Mac).

  2. 2

    The formatted, indented output appears instantly in the right panel with colour-coded syntax highlighting.

  3. 3

    Use the indentation toggle to switch between 2-space and 4-space indentation based on your preference.

  4. 4

    Click the "Copy" button to copy the formatted JSON to your clipboard, ready to paste into your editor or API client.

Features

  • ✓ Instant formatting
  • ✓ Syntax validation with error hints
  • ✓ Configurable indentation (2 or 4 spaces)
  • ✓ Copy to clipboard
  • ✓ Runs 100% in browser

Frequently Asked Questions

Is my JSON data sent to a server?

No. All formatting runs in your browser. Your data never leaves your device.

Can it handle large JSON files?

Yes, up to several MB. For very large files, consider splitting into smaller chunks for easier readability.