JSON Formatter Online
Format and validate JSON instantly.
Open JSON FormatterFree · No sign-up · Browser-based processing
What JSON Formatter does
JSON is easy for machines to read but minified API responses and configuration files are difficult to review. This formatter parses the document, reports invalid syntax and prints valid JSON with consistent indentation.
Common uses
- Review REST and GraphQL API responses
- Check package.json, tsconfig and service configuration
- Make minified logs readable before debugging
How to use JSON Formatter
- Paste a JSON object, array or primitive into the input editor.
- Run the formatter to validate the syntax and create an indented result.
- Copy the formatted JSON into your editor, issue report or API client.
Privacy: Runs locally in your browser. Input is not uploaded to the DevNet Kit server.
JSON Formatter example
Try the tool with this representative input:
{"name":"Ada","active":true,"tags":["dev","network"]}JSON Formatter FAQ
Does this JSON formatter upload my data?
No. Formatting uses the browser JSON parser and the input is not sent to the DevNet Kit server.
Does it change JSON values?
No. It changes whitespace and indentation only. Property order and parsed values are preserved by the browser parser.
Why does formatting fail?
The input must be valid JSON. Common causes include trailing commas, comments, single-quoted strings and unquoted property names.