JSON Validator & Formatter

JSON Validator & Formatter checks your JSON syntax instantly. Paste or type JSON, or open a .json file, and see right away whether it is valid. If there is a problem, you get a detailed error message with the exact line and column, a preview of the faulty line and a button that takes you straight to the error. You can also format and beautify JSON with 2 spaces, 4 spaces or tabs for better readability, or minify it to remove unnecessary spaces. Copy the result with one tap or save it as a file. MADE FOR LARGE JSON • Validates files of tens of megabytes (up to 200 MB) with progress and a Cancel button • Large content is processed in streaming mode, so the app stays responsive • If something does not fit in memory, you get a clear message instead of a crash FEATURES • Automatic validation as you type • Strict validation following the JSON standard (RFC 8259) • Clear errors: missing comma or colon, trailing comma, unclosed string, single quotes, invalid numbers and more • Format with 2 spaces, 4 spaces or tab • Minify JSON • Copy or save the result • Statistics: characters, lines, objects, arrays and depth • Light and dark mode • More than 70 languages PRIVATE AND OFFLINE Your JSON never leaves your device: everything is processed 100% locally, with no account and even without internet. Ideal for developers, testers and students who work with APIs, configuration files and data. Free with ads. Download JSON Validator & Formatter and fix your JSON in seconds!

First release of JSON Validator! Validate JSON offline, see the exact line and column of each error, and format or minify it with one tap. Supports large files and more than 70 languages.