About the JSON Formatter
Paste JSON to beautify it with clean indentation, validate it, or minify it for production. If the JSON is invalid, you get a clear error message with the exact line and column, so you can fix it fast. Your data is processed locally and never sent anywhere.
How to use the JSON Formatter
- Paste your JSON into the input box, or click Sample.
- Click Format to beautify, or Minify to compress.
- Fix any errors using the line and column shown.
- Copy or download the result.
Features
- Beautify with 2 spaces, 4 spaces or tabs
- Minify JSON to a single line
- Validation with line and column of the error
- Optional alphabetical key sorting
- Copy and download as .json
Common JSON errors
The most common mistakes are trailing commas after the last item, single quotes instead of double quotes, unquoted keys, and comments, none of which are allowed in standard JSON.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting and validation run in your browser, so API keys and private data stay on your machine.
What is the difference between format and minify?
Format adds line breaks and indentation to make JSON readable. Minify removes all unnecessary whitespace to make the file as small as possible.
Why does my JSON show an error?
Check the line and column in the message. Trailing commas, single quotes and missing quotes around keys are the usual causes.
Can it handle large files?
Yes. Files of several megabytes format in well under a second on most devices.