JSON Formatter & ValidatorFree Online JSON Beautifier
Paste your JSON to format, validate and minify instantly. Runs in your browser — nothing is sent to a server.
How to use the JSON Formatter & Validator
- Paste raw JSON into the left input box. Validation runs as you type.
- Click Format to beautify the JSON with indentation, or Minify to compress it into a single line.
- Use Copy result when the output is ready, or Clear to reset both panels.
Best use cases for JSON formatting
This tool is useful for reading API responses, checking configuration files, cleaning webhook payloads, preparing mock data, debugging front-end state and sharing compact JSON snippets. Everything runs locally in your browser for the core formatting workflow, so pasted JSON is not uploaded for formatting.
What the validator checks
The validator uses the browser JSON parser and reports syntax problems such as trailing commas, missing quotes, unclosed objects, invalid escape sequences and unexpected tokens. When the browser exposes a character position, the error message includes the line and column.
Common JSON formatting tasks
Use this page when you need to format JSON online, validate a JSON error line, beautify API responses, minify JSON for storage, clean webhook payloads or check whether a configuration file is valid JSON. The formatter is useful for small debugging tasks because it does not require installing a desktop app or uploading private API data.
JSON Formatter FAQ
Is this JSON formatter free?
Yes. You can format, validate, minify, copy and clear JSON directly in the browser.
Does my JSON upload to a server?
No. The formatting and validation logic runs locally in your browser, and the server only delivers the page.
Why does valid JavaScript object syntax fail?
JSON is stricter than JavaScript object literals. Keys and string values must use double quotes, and comments or trailing commas are not allowed.
Can it show where a JSON error happened?
Yes when the browser provides the character offset or line and column. The tool converts that into an easy-to-read position next to the parser message.
What is the difference between format and minify?
Format adds indentation and line breaks for readability. Minify removes unnecessary whitespace to make JSON smaller for storage, URLs or API payloads.