Paste JSON to validate it, pretty-print it with indentation, or minify it down to a single line.
The formatter parses your JSON entirely inside your browser using JavaScript's own JSON parsing — nothing you paste is ever uploaded to a server, which matters if you're working with sensitive API responses, configuration files, or data during development.
Valid JSON is reformatted with consistent indentation, making deeply nested objects and arrays far easier to read than a single-line minified blob — especially useful when debugging an API response or checking a configuration file's structure.
Invalid JSON doesn't just fail silently — the error message includes the parser's best guess at where the problem is, typically pointing to the character position of a missing comma, an unescaped quote, or a trailing comma, which are the most common reasons JSON fails to parse.
Yes — parsing happens entirely in your browser using JavaScript's built-in JSON functions. Nothing you paste is sent to a server or stored anywhere.
Your JSON has a syntax problem — commonly a missing comma, an unescaped quote inside a string, or a trailing comma before a closing bracket. The error includes the parser's best guess at the character position where it went wrong.
Formatted JSON adds consistent indentation and line breaks, making the structure of nested objects and arrays visually clear — much easier to debug or review than a single dense line of minified text.
Yes — if your JSON parses successfully, it's syntactically valid JSON. If it doesn't, you'll get an error pointing toward the likely problem.
