JSON Formatter Online – Beautify and Format JSON Data

Format, validate, view, convert, and minify JSON or JSON5 in your browser. Select the accepted input syntax and desired output syntax separately, choose tabs or 2 to 4 spaces, and optionally sort object keys recursively. Syntax errors are shown in the output editor.

JSON and JSON5 Syntax

Choose JSON or JSON5 independently for the input and output. JSON5-to-JSON5 formatting preserves comments, while conversion, key sorting, and minification serialize the parsed data into the selected output syntax.

JSON5 input accepts:

Unquoted field names are allowed (e.g., {name: "Alice"} instead of {"name": "Alice"});
Single quotes can be used for strings (e.g., {'name': 'Bob'});
Trailing commas are permitted (e.g., {"a": 1, "b": 2,});

Use JSON output for APIs and systems that require standard JSON. Use JSON5 output for developer-maintained configuration where comments, NaN, Infinity, and other JSON5 values need to remain valid.