JSON Formatter & Validator

It pretty-prints JSON with your chosen indentation, minifies it back to a single line, and validates it as you type. If the text is not valid JSON, it shows the parser message and, where possible, the line and column of the problem.

The most common causes are single quotes instead of double quotes, trailing commas after the last item, unquoted keys like {name: 1}, comments, or a stray character. Fix the spot shown in the error and it should validate.

Formatting (beautifying) adds line breaks and indentation so the structure is easy to read and diff. Minifying removes all optional whitespace to make the smallest possible payload for APIs, config, or storage. Both describe the exact same data.

No. Parsing, formatting, and validation all run locally in your browser with the built-in JSON engine. Nothing you paste is sent to a server, so it is safe for private or sensitive payloads.

Two spaces is the most common default and keeps deep structures compact. Four spaces is easier to scan for some people, and tabs let each reader set their own width. Pick whatever matches your project style guide.