Paste your JSON and instantly format, validate, or minify it -- right in your browser. This free JSON formatter online highlights syntax errors with line numbers, calculates structure stats, and lets you copy the result in one click. Nothing is sent to a server; all processing happens locally.
A JSON formatter takes raw or compacted JSON data and restructures it with consistent indentation and line breaks so the content is easy to read. This tool parses your input, verifies the syntax is valid, and outputs the data with your choice of two-space or four-space indentation. Formatted JSON is far easier to scan when debugging API responses, editing configuration files, or reviewing data exports.
The validator runs your input through the browser's native JSON parser. When a syntax error exists -- such as a missing comma, unquoted key, or trailing comma -- the parser returns a description and the approximate character position. This tool converts that position into a line number and column so you can jump directly to the problem. Common mistakes it catches include single-quoted strings, missing closing brackets, and extra commas after the last element in an array or object.
JSON beautify (also called pretty-print) adds indentation and newlines to make the structure human-readable. JSON minify does the opposite -- it strips all unnecessary whitespace to produce the smallest possible output. Beautified JSON is ideal during development and debugging. Minified JSON is used in production APIs and configuration payloads because it reduces bandwidth and file size, sometimes by 30-60 percent on deeply nested structures.
Yes. This JSON formatter runs entirely inside your browser using JavaScript. Your data never leaves your device -- there are no network requests, no server-side processing, and nothing is logged or stored. You can verify this by opening your browser's developer tools and watching the Network tab while you format JSON. This makes it safe for working with API keys, tokens, and other sensitive payloads that should not be shared with third-party services.