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JSON Formatter
Format, validate and minify JSON.
DeveloperProcessed locally. Your input never leaves your browser.
About
Format, minify and validate JSON entirely in your browser. Nothing is uploaded.
Paste JSON to turn compact or hard-to-read data into consistently indented output. You can also validate the syntax before using it in an API, configuration file, or test fixture, then minify it again for transport.
What you can do
- Formats JSON with readable two-space indentation.
- Validates syntax and reports a useful error location when the browser provides one.
- Minifies valid JSON and copies the result in one click.
Common uses
- Inspect an API response or webhook payload.
- Check a configuration file before deployment.
- Prepare compact JSON for a request body or fixture.
Frequently asked questions
Is my JSON uploaded?
No. Formatting, validation, and minification run locally in your browser.
Why is my JSON invalid?
Common causes include trailing commas, single quotes, unquoted keys, comments, or a missing bracket. JSON requires double-quoted keys and strings.