JSON Formatter

JSON Formatter prettifies, minifies, and validates JSON in your browser. Paste your data, and the tool tells you whether it parses, where the error is if it doesn't, and lets you switch between an indented and minified form with a single click. The validator pinpoints syntax errors with a line and column, so you don't have to scan through nested braces by hand. The formatter uses standard JSON.stringify with your chosen indent (2 or 4 spaces, or compact). The minifier strips all unnecessary whitespace and re-emits the smallest valid form — useful before stuffing JSON into a URL parameter, a config field, or a database column. Everything runs in your browser, so the JSON you paste never leaves your device. That makes the tool safe for API responses, configuration data, and anything else you'd rather not share. Common uses include reading the response of an API call you logged from a network tab, cleaning up JSON that came back as a single very long line, validating a config file before deploying it, comparing the structure of two payloads side-by-side after formatting them with the same indent, and checking that a request body is well-formed before sending it.