JSON formatting/compression/syntax checking tool
As a JSON Formatter, you can perform indentation, compression to one line, and check syntax error locations within the browser.
JSON input and conversion
It supports pasting text and selecting/dropping .json files.
Input JSON
Direct inputConversion result
0 characterssyntax error
Processing results
You can check the structure and input/output size, and copy or save the formatting results.
- object
- 0
- Layout
- 0
- Keys
- 0
- maximum hierarchy
- 0
- Input
- 0 B
- Output size
- 0 B
About this tool
You can format JSON in API responses, configuration files, and logs for readability and check for syntax errors.
Features
- JSON formatting, compression, syntax checking
- 2/4/8 spaces or tabs, LF/CRLF
- Error display with rows and columns, duplicate key warning
- Preserves large integers and exponential notation without converting them into strings
How to use
- Paste the JSON or open the .json file.
- Select indentation and line breaks.
- Performs formatting, compression, and syntax checking.
- Copy or save the results as needed.
Limitations
- JSON5 containing comments, trailing commas, and single quotes is not supported.
- For very large JSON, syntax highlighting is omitted, but formatting, minification, and validation continue.
- The size that can be processed depends on the available memory of the device and browser.
Privacy: Input and results are processed in your browser and are neither sent to nor stored on the Develop Tools server.