JSON Formatter
Format, validate and beautify JSON data.
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How to use JSON Formatter
- 1Paste your raw JSON into the input area
- 2Click 'Format' to beautify the JSON
- 3Click 'Minify' to compress it
- 4Copy the formatted result with one click
Pro tip: Use this to debug API responses or validate JSON configuration files.
What is a JSON Formatter?
A JSON formatter (also called JSON beautifier or JSON pretty-printer) takes minified or poorly formatted JSON data and restructures it with proper indentation, line breaks, and syntax highlighting. It also validates your JSON to catch syntax errors like missing brackets, trailing commas, or unquoted keys. Our free online JSON formatter processes everything in your browser — your API responses, config files, and data never leave your device.
When to Use a JSON Formatter
- Debugging API responses that come back as a single minified line
- Validating JSON configuration files before deploying to production
- Formatting package.json, tsconfig.json, or other config files for readability
- Minifying JSON payloads to reduce bandwidth in API requests
- Comparing two JSON objects by formatting them consistently
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's the most common format for APIs, configuration files, and data storage in web development.
What's the difference between formatting and minifying?
Formatting (beautifying) adds indentation and line breaks for readability. Minifying removes all unnecessary whitespace to reduce file size. Both produce valid JSON — formatting is for humans, minifying is for machines.
Why am I getting a JSON validation error?
Common JSON errors include: trailing commas after the last item in an array/object, single quotes instead of double quotes, unquoted property names, and missing closing brackets. Our formatter highlights exactly where the error occurs.
Can I format large JSON files?
Yes. Since processing happens in your browser, performance depends on your device. Modern browsers can handle JSON files of several megabytes without issues. For extremely large files (100MB+), consider using a CLI tool like jq.