Developer
JSON Formatter
- Browser-based
- No signup
Browser-based
Paste JSON to format it with 2-space, 4-space, or tab indentation, minify it into a single line, or sort object keys alphabetically. Invalid JSON shows a parse error with line and column when available. All processing runs in your browser.
How to use this tool
1. Paste minified or messy JSON. 2. Click Format for readable indentation or Minify to compress. 3. Fix any syntax error the parser reports. 4. Copy the output into your editor or API client.
Worked example
Example: {"name":"Ada","roles":["admin","editor"]} becomes indented multi-line JSON with clear nesting for code review.
Common examples
- Minified API response from `curl` → indented JSON for diffing against staging.
- Invalid trailing comma in config JSON → parser error line highlighted before deploy.
- Large nested object → collapse sections mentally after pretty-print for code review.
Common searches
- json formatter
- json beautifier
- pretty print json
- json minify
- format json online
How it works
Paste JSON to format it with readable indentation or minify it into a single line. Invalid JSON shows a parse error with line and column when available. Optional key sorting orders object keys alphabetically. Formatting runs entirely in your browser.
Limitations
Invalid JSON will not format until syntax errors are fixed. Very large documents may slow the browser tab.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Important notice
Invalid JSON will not format until syntax errors are fixed. Very large documents may slow the browser tab.
Frequently asked questions
What can I do with this tool?
You can format JSON with readable indentation, minify it into a compact single line, and optionally sort object keys alphabetically.
What happens if my JSON is invalid?
The tool shows a parse error. When the browser reports a character position, the error also includes the line and column.
Is my JSON stored?
No. Formatting and validation run locally in your browser and input is not stored.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
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