JSON Formatter
Format, beautify, minify and validate JSON online. Pick an indent size, catch syntax errors with the exact line number, then copy or download clean JSON.
How it works
- 01Paste or type your JSON into the input box.
- 02Choose an indentation size, or switch to minify mode.
- 03See it formatted live, with a clear error if the JSON is invalid.
- 04Copy the result or download it as a .json file.
Frequently asked questions
What does the JSON formatter do?
It parses your JSON and re-prints it with consistent indentation so nested objects and arrays are easy to read. It can also minify JSON to a single line and validate that the syntax is correct.
How do I find errors in my JSON?
If the text is not valid JSON, the tool shows a friendly error message with the line and column where parsing failed, so you can jump straight to the missing comma, bracket or quote.
Can I change the indentation?
Yes. Choose 2 spaces, 4 spaces or tab indentation for the formatted output. Minify mode removes all optional whitespace to produce the smallest possible valid JSON.
Is my JSON uploaded anywhere?
No. Parsing and formatting happen entirely in your browser with JavaScript. Your data never leaves your device, so it is safe to format private API responses or configuration files.
Does it handle large JSON files?
It comfortably handles typical API payloads and config files. Formatting runs locally, so very large documents depend on your device's memory, but there is no upload size limit.