JSON formatter

JSON is stricter than JavaScript. Keys and strings must use double quotes, trailing commas are not allowed, comments are not allowed, and values can only be objects, arrays, strings, numbers, true, false or null. A single quote, a comment line or a stray comma after the last item are the usual causes, so fix the first one you find and check again.

Minify removes every space and line break between tokens so the document fits on one line, which is the smallest valid form for API calls, configuration strings and logs. It never changes values or key order, and pretty printing a minified document gives back the same data, so the two are safe to switch between.

Object keys are sorted in code-point order, so digits come before uppercase letters and uppercase before lowercase, and the sort is applied recursively inside nested objects. Arrays keep their order because position carries meaning. Sorted output makes two versions of a document line up in a diff tool.

The tool uses the browser's built-in JSON parser, so integers above 2^53 (about nine quadrillion) lose precision, a float such as 1.0 comes back as 1, and when a key appears twice only the last value survives. If you need exact big integers or IDs, keep them as strings before formatting.

Keys is the total number of object keys at every level. Depth is the deepest nesting of objects and arrays, where a flat object is 1 and a lone number or string is 0. Bytes is the UTF-8 size of the output, which is what a file or an HTTP body would occupy; a Korean character counts as 3 bytes.