qevroJSON Formatter
Paste or upload your JSON to beautify, validate, and format it. Errors are highlighted inline.
About JSON Formatting
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is used extensively in web APIs, configuration files, and data storage. JSON supports objects, arrays, strings, numbers, booleans, and null values.
How to Format JSON Online
Paste your minified or unformatted JSON into the input panel, click Format, and instantly get beautified JSON with proper indentation. You can also upload a .json file by dragging it onto the editor or clicking Upload. The output panel shows syntax-highlighted, properly indented JSON that you can copy or download.
Common JSON Errors and How to Fix Them
The most common JSON mistakes include trailing commas after the last item in an array or object, using single quotes instead of double quotes, unquoted property names, missing commas between items, and unclosed brackets or braces. Our formatter detects these errors instantly and shows the exact line and position where the problem occurs.