Runs in your browser — nothing you paste is uploaded.
JSON Formatter & Validator
Beautify, minify, and validate JSON — with a clear message when something's wrong. Runs entirely in your browser.
Output updates as you type. 2-space indentation.
Beautify & minify
Beautify pretty-prints with 2-space indentation for readability. Minify strips all whitespace for the smallest payload. Either way the JSON is parsed first, so invalid input is caught.
Validation
If the JSON is malformed, you get the parser's error message and, where the browser provides it, the character position — so you can jump to the problem.
Privacy
Parsing happens locally; nothing you paste is uploaded.
Frequently asked questions
Is my JSON uploaded anywhere?
No — parsing, formatting and validation all happen in your browser.
What counts as valid JSON here?
Strict JSON: double-quoted keys and strings, no trailing commas, no comments. Invalid input shows the parser's message and, where the browser provides it, the position.