Free online tool
Free Online JSON Formatter & Validator
Format, validate, and beautify JSON online for free. Paste your JSON, get pretty-printed output with error highlighting. Instant, no signup required.
01How it works
Paste your JSON
Paste any JSON — minified, pretty-printed, or even broken — into the input field.
Validate and format
The formatter validates your JSON and shows any errors with exact line and column numbers. Valid JSON is immediately pretty-printed.
Copy or download
Copy the formatted JSON to your clipboard or download it as a .json file.
FAQ
Frequently asked questions
What does the JSON formatter do?
It parses your JSON, validates it against the JSON specification, and outputs a clean, indented version. It also highlights syntax errors with the line and column number so you can fix them quickly.
Can it handle very large JSON files?
Yes, up to about 10 MB in your browser. For files larger than 10 MB the formatter will warn you. For automated processing of large JSON datasets, anyrow's API handles bulk operations at scale.
Does it support JSON with comments (JSONC)?
The formatter will attempt to strip single-line (//) and block (/* */) comments before parsing and will note that comments were removed. Standard JSON does not support comments.
What is the minify option?
Minify removes all whitespace and newlines, producing the most compact valid JSON. This is useful for reducing payload sizes in APIs or configuration files.
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