About the JSON Formatter
This free online JSON formatter instantly beautifies and validates your JSON. Paste it in and the tool re-indents it and applies color syntax highlighting — keys, strings, numbers, booleans and null each get their own color, so the structure is easy to read at a glance.
Everything runs in your browser. Your data is never uploaded.
Features
- Color highlighting — different colors for keys vs values, and a distinct color for each data type (string, number, boolean, null)
- Validate — clear error messages with the position of any syntax problem
- Indentation — 2 spaces, 4 spaces or tabs
- Minify — collapse JSON to a single compact line
- Copy the formatted result in one click
Common uses
- Read and debug API responses
- Tidy up minified or messy JSON
- Validate JSON before pasting it into code or a config file
How to use it
- Paste your JSON into the input box
- It formats and color-highlights live as you type — invalid JSON shows an error with its position
- Pick an indent size (2/4 spaces or tab), or choose Minify for one compact line
- Click Copy to grab the formatted result