🧩JSON Formatter & Validator

Online JSON Formatter — clean code in one click

Our free JSON formatter (JSON beautifier) instantly transforms a compact, single-line structure into readable, properly indented code. Choose your indentation — 2 spaces, 4 spaces, or a tab — and click `Format`. You can copy the result to the clipboard right away. The tool runs entirely in your browser, so no data ever reaches the server.

JSON Validator — find errors in seconds

If the pasted JSON contains a syntax error, the tool will display a red message with the error details and the line and column number where the problem occurred. This way you don't have to manually scan hundreds of lines — you go straight to the right place. Need the smallest possible output? Use the `Minify` button, which removes all unnecessary spaces and newlines.

Frequently asked questions

Is the JSON formatter free and safe?

Yes, it is completely free. All processing happens in your browser — no part of your JSON is sent to a server. You can safely paste sensitive data.

What does a JSON syntax error mean and how do I fix it?

The most common causes are: a missing comma between fields, single quotes instead of double quotes, comments (JSON does not support them), or a trailing comma after the last element of an array or object. The tool shows the line and column of the error — start your check there.

What is the difference between formatting and minifying JSON?

Formatting (beautify) adds indentation and new lines, making JSON human-readable. Minification removes all unnecessary whitespace and reduces file size — useful before sending data via an API or storing it in a database.

Can I choose the indentation size?

Yes. Before clicking `Format`, choose your indentation: 2 spaces (popular standard in JS/TS), 4 spaces (Python, Java), or a tab. Changing the indentation on an already-formatted result immediately recalculates the output.