JSON Formatter
Format, validate, and beautify JSON data. Minify compressed JSON or expand it with proper indentation for readability.
About the JSON Formatter
Format, beautify, minify, and validate JSON data with our free online JSON formatter. Paste any JSON string and instantly see it formatted with proper indentation for readability. Invalid JSON is highlighted with an error message showing where the problem is. Choose between pretty-print (expand) or minify (compress) modes. Supports adjustable indent width (2 or 4 spaces, or tabs). Perfect for developers working with API responses, configuration files, or any JSON data.
Features
- Beautify JSON with proper indentation
- Minify JSON to compact single-line format
- Validate JSON syntax with error highlighting
- Adjustable indent size (2 spaces, 4 spaces, tabs)
- Copy formatted/minified JSON to clipboard
- 100% private — browser-only processing
How to use this tool
The JSON Formatter works right in your browser — no signup, no installation. Follow these steps:
- Paste your JSON data into the input area.
- Choose Format (beautify) or Minify (compress).
- For Format mode, select your preferred indent size.
- Click Copy to save the result.
Frequently asked questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. It uses key-value pairs and ordered lists to represent structured data.
What happens if my JSON is invalid?
The tool validates your JSON and shows an error message if it is not valid. Invalid JSON will not be formatted — the error will point to where the problem occurs so you can fix it.
Using the results
Developers and power users need tools that are exact and private. The JSON Formatter runs its logic locally in your browser, returns results instantly, and never transmits your input — handy when you are working with keys, hashes, or data you would rather not paste into a remote service.