> tools / json_formatter

JSON formatter.

Format. Validate. Minify. Copy exact JSON values.

Inputs stay on your device

01Input

JSON to format

Paste an object, array, or any JSON value. Comments, trailing commas, and single quotes are invalid.

Limit 1 MiB

02Settings

JSON / TEXT

Indentation

Update as you type

Ctrl/Cmd + Enter updates the result immediately. Formatting changes only whitespace outside strings.

Reading and formatting JSON

{"baud":115200,"enabled":true} becomes readable with indentation. Minify removes whitespace outside strings for a compact payload.

Numbers such as 18446744073709551615, exponent notation, negative zero, string escapes, and property order are preserved exactly. Duplicate keys are preserved and flagged; different JSON readers may handle them differently.

Root items count an object’s properties or an array’s entries. A scalar counts as one item. Character counts use UTF-16 code units; byte counts use UTF-8.

Input is limited to 1 MiB, 128 nested objects/arrays, and 100,000 tokens. Output is limited to 4 MiB. Large output uses a plain text preview. Syntax follows RFC 8259 ↗.