JSON Formatter & Validator

Format, validate, and minify JSON in one click. Our JSON Formatter catches syntax errors instantly with clear messages, lets you choose 2 or 4 space indentation, and copies results to your clipboard.

Built for developers who debug APIs, configuration files, or data pipelines daily. Works fully offline — your JSON never leaves your browser.

Formula
JSON.parse() + JSON.stringify() with configurable indentation

FAQ

What does "minify" mean?
Minifying removes all whitespace and formatting, producing a compact single-line JSON — useful for network transmission or storage.
How do I fix invalid JSON?
Paste it into the validator and it will highlight exactly where the error is — common issues are trailing commas, single quotes instead of double quotes, or unescaped characters.

Related Calculators