Developer Utility
JSON Formatter
Format or minify JSON data, validate syntax, and check object count, array count, key count, character count, and compression rate.
JSON Code Input
Paste JSON data to format or minify, then choose the conversion option you need.
Conversion Result
Check formatted, minified, or validation results, then copy or save them as a file.
Enter JSON data, then click Format, Minify, or Validate.
Compare JSON Workflows
Use formatting, minifying, validation, and download features depending on your task.
Formats object and array structures with line breaks and indentation. Useful for API response analysis, configuration checks, and debugging.
Removes unnecessary spaces and line breaks to compress JSON into one line. Useful for storage data or transfer data checks.
Checks syntax errors in the entered JSON. Useful for finding missing commas, quotes, or brace errors.
Help
What is JSON Formatter?
JSON Formatter is a free developer utility that formats single-line or deeply nested JSON into a readable structure and can also minify it by removing spaces and line breaks.
You can use it for checking API responses, reviewing configuration files, cleaning log data, frontend debugging, backend response analysis, and building blog utilities.
Supported Features
- JSON syntax validation
- Automatic indentation and line break formatting
- Single-line JSON minification by removing spaces and line breaks
- 2-space, 4-space, and tab indentation options
- Object, array, key, line, character, and compression rate statistics
- Copy converted results and download JSON files
Useful For
- Formatting API response JSON
- Restoring minified single-line JSON
- Checking nested structures in configuration files
- Quickly finding JSON syntax error causes
- Inspecting response data during frontend or backend development
- Saving cleaned JSON as a file
How do I use auto format?
When auto format is enabled, the result area updates automatically using the selected indentation as you type JSON data. It is useful for checking the structure immediately after pasting API responses or configuration data.
What errors does syntax validation check?
JSON syntax validation checks errors that cannot be parsed by JSON.parse, such as missing commas, invalid quotes, unclosed braces, or unclosed brackets.
How is compression rate calculated?
Compression rate compares the input JSON length with the result JSON length and shows the reduced percentage. It is a quick reference for how much shorter the minified result became.
Can I add comments to JSON?
Standard JSON does not support comments. Data containing comments may be treated as a syntax error. Use JSONC or another configuration format if comments are required.
Can I enter sensitive data?
This tool is best used for browser-side JSON processing, but you should remove sensitive values such as API keys, tokens, personal information, and passwords before entering data.
Where can I use the downloaded JSON?
Downloaded JSON can be used for configuration files, test data, API response samples, or documentation attachments. Before using it in a real service, always check that the data structure and values are correct.