JSON Formatter & Validator
Format, beautify, validate, and minify JSON data instantly. Paste your JSON and get it formatted with proper indentation.
About JSON Formatter
JSON (JavaScript Object Notation) is the most widely used data format for APIs and web applications. Our JSON formatter takes minified or unformatted JSON and adds proper indentation to make it human-readable. It also validates your JSON and shows precise error messages if the syntax is incorrect.
Unlike other JSON formatters, BytePane runs entirely in your browser. Your data never touches a server, making it safe for formatting sensitive API responses, configuration files, or database records. The formatter supports JSON files of any size that your browser can handle.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It is easy for humans to read and write and easy for machines to parse and generate. JSON is based on a subset of JavaScript and is language-independent.
Is my data safe?
Yes. BytePane processes everything in your browser using JavaScript. Your JSON data never leaves your device — no server requests are made. You can verify this by checking the network tab in your browser DevTools.
What is the maximum JSON size supported?
BytePane can handle JSON files up to several megabytes in size. For very large files (100MB+), consider using a desktop tool like jq. The browser tab may become slow with extremely large inputs.
How do I validate JSON?
Simply paste your JSON into the input field. If the JSON is valid, it will be formatted and displayed. If there are syntax errors, an error message will show the exact location of the problem.