What is a JSON Formatter?
A JSON Formatter, also called a JSON beautifier, adds consistent indentation and line breaks to valid JSON so it is easier to read, inspect, and share.
JSON Formatter & Validator
Format, validate, and minify JSON directly in your browser.
How it worksHow to format and validate JSON
- Paste JSON into the editor or upload a .json file up to 5 MB.
- Select Format to make the document readable, or Minify to remove extra whitespace.
- Check the validation message. If the JSON is invalid, use the reported line and column to correct it.
- Copy the result or download it as a .json file when you are done.
Common JSON formatting uses
Format API responses, validate request payloads, inspect configuration files, debug exported data, and make minified JSON readable before sharing it in documentation or a code review.
Common JSON validation errors
- Use double quotes around property names and string values.
- Remove trailing commas after the final item in an object or array.
- Remove comments, because standard JSON does not support them.
JSON Formatter FAQ
What is a JSON Validator?
A JSON Validator checks whether JSON follows the required syntax. DevKit reports parsing errors with a line and column number to help you find the problem quickly.
Can I minify JSON?
Yes. Select Minify to remove unnecessary whitespace from valid JSON while keeping the underlying data unchanged.
Is my JSON uploaded to a server?
No. Formatting, validation, and minification run locally in your browser. DevKit does not upload or store the JSON or .json files you use in this tool.
Can I format JSON API responses and configuration files?
Yes. The tool is useful for REST and GraphQL API responses, configuration files, exported data, and any other valid JSON document up to 5 MB.