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!