Can this tool validate JSON?

Yes — paste your JSON and the tool will instantly detect syntax errors with line numbers and clear error messages.

Yes — click the "Minify" button to remove all whitespace and produce compact JSON output.

JSON Formatter & Validator — Beautify JSON Free

How to format JSON online?

Paste your JSON into AnyTool JSON Formatter, then click Format. The tool validates the syntax, highlights errors, and produces beautifully indented output. You can also minify, copy, or download the result.

What is

JSON Formatting

JSON formatting (or beautifying) adds consistent indentation and line breaks to raw JSON data, making it human-readable and easier to debug. The inverse operation, minification, removes all whitespace.

Developer Tools

Related terms

JSON BeautifierJSON MinifierJSON ValidatorPretty Print

Detailed Explanation

Methodology

How JSON Formatting Works

AnyTool formats JSON by parsing the input with JSON.parse(), then serializing with JSON.stringify() using configurable indentation (2 or 4 spaces). Syntax errors are caught and displayed with line numbers and error messages. Minification removes all whitespace.

Uses native JSON.parse/stringify for standards compliance
Syntax highlighting via regex-based tokenizer
Error detection with line numbers
Beautify (indent) and minify modes