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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 input
0 characters

Conversion result

0 characters

Please enter JSON or select a file.

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

  1. Paste the JSON or open the .json file.
  2. Select indentation and line breaks.
  3. Performs formatting, compression, and syntax checking.
  4. Copy

Limitations

Privacy: Input and results are processed in your browser and are neither sent to nor stored on the Develop Tools server.

About this tool

You can format JSON in API responses, configuration files, and logs for easy reading and see lines and columns for syntax errors.

Features

  • JSON formatting, single line compression, syntax checking
  • 2/4/8 spaces and tabs, LF/CRLF, trailing line feed
  • Line numbers, syntax coloring, duplicate key warnings, lexical preservation of large integers

How to use

  1. Paste the JSON or select and drop the .json file.
  2. Select the indent width, line break code, and trailing line break.
  3. Perform formatting, compression, syntax checking, and copy or save the results as needed.

Limitations

  • JSON5 containing comments, trailing commas, and single quotes is not supported.
  • The size that can be processed depends on the available memory of the device and browser.

Related tools

Guides and troubleshooting

Privacy: Selected files and conversion or analysis results are processed in your browser and are neither sent to nor stored on the Develop Tools server.