JSON Formatter

Paste and beautify instantly. Errors like duplicate keys, trailing commas, Chinese punctuation, and unquoted keys are reported with exact line and column positions. Everything runs in your browser; nothing is uploaded.

Paste to parse No external requests Errors with line/column

JSON Input

Supports arrays, objects, deep nesting, and all valid escapes

Indent

Sort keys alphabetically (array order preserved)

Escape non-ASCII as \uXXXX (legacy CMS mode)

Text ⇄ String Field

Pack multi-line text into a string field, or unpack a field back to plain text

Multi-line text → JSON string field

JSON string field → plain text

Escaping uses JSON's own sequences (, etc.). Multi-line text carries newlines when pasted; they must be escaped when packed into a field.

—

0Output chars

0Input chars

0Nodes

0Objects

—Max depth

0Duplicate keys

—

Where the error is

Parse errors appear here only; your input is untouched

Valid JSON is beautified and output here. On parse failure, the error line, column, and source excerpt are shown here.