JSON Formatter & Validator

Paste JSON directly upload a.json file. Drag one onto the input panel. Works with any structure: objects, arrays, nested data or a single value.

A trailing comma, quotes instead of double, an unquoted key, a stray NaN or Infinity even a hidden BOM character at the start of a file: each gets its own specific explanation with the exact line and column instead of a generic parser error. Valid JSON, with a key gets flagged too since the last value silently overwrites earlier ones.

Valid JSON is instantly indented and color coded by type: keys, strings, numbers and booleans all shown differently nested structure is easy to scan.

Copy the formatted JSON to your clipboard or save it as a.json file by clicking the download button. Minify first if you want the version instead.