JSON Formatter & Beautifier
Beautify and indent JSON data instantly. Paste, format, copy. Runs in your browser — your data never leaves your device.
JSON Formatter beautifies and indents raw JSON instantly so it's readable. ConvertDa's free JSON Formatter runs entirely in your browser — paste your JSON, choose 2 spaces / 4 spaces / tab indentation, and copy the result. Useful for API responses, config files, and debugging.
How to json formatter
- 1
Paste your JSON into the input area.
- 2
Choose indentation: 2 spaces, 4 spaces, or tab.
- 3
Copy the formatted output.
Frequently asked questions
Is my JSON sent to a server?▾
No. Formatting runs entirely in your browser. Your data never leaves your device.
What if my JSON has errors?▾
The tool reports the error message and the line/column where it failed, so you can fix it.
Does it support large files?▾
Yes — JSON files up to several MB format instantly. Truly massive payloads (10+ MB) may slow down your browser.
Why does my JSON say 'Unexpected token'?▾
JSON has stricter rules than JavaScript: keys must be double-quoted, no trailing commas, no comments. The error message tells you the exact line and column where the parser stopped.
Will it sort the keys alphabetically?▾
No — keys keep their original order. JSON spec says objects are unordered, but most parsers preserve insertion order, so the formatted output matches what you input.