JSON Formatter
Beautify, minify and validate JSON — errors pinpointed.
What this JSON tool does
Paste any JSON — from an API response, a config file or a log — and format it with consistent indentation so nested structures become readable. Minify collapses it to a single line for transport or storage. "Sort keys" alphabetizes every object, which makes diffs between two JSON files far easier to read.
Invalid JSON is the everyday case: this tool reports the exact position of the first syntax error along with a human-readable reason — a missing comma, an unquoted key, a stray trailing comma — so you can fix it without hunting character by character.
FAQ
Why is my JSON invalid?
The most common causes: keys not wrapped in double quotes, single quotes instead of double quotes, trailing commas after the last item, and unescaped newlines inside strings.
Does it send my data anywhere?
No. Parsing and formatting run in JavaScript inside your browser tab. It is safe for API responses containing tokens or private data.
Can it handle large JSON?
Yes — files of several megabytes format fine, since modern JavaScript engines parse JSON natively.