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TOOL IDB-SWE-016
JSON formatter

Desktop only

Engineering tools are available only on desktop screens.

JSON formatter & validator

Paste raw JSON, get prettified output with syntax errors located by line and column. Counts keys, depth, and total size.

Document structure —
tree value types size input — B output — B
Engineering notes

JSON spec quirks

  • Trailing commas are invalid (unlike JS).
  • Single-quoted strings invalid — must be double-quoted.
  • Keys must be strings; unquoted keys are invalid.
  • NaN, Infinity, undefined not allowed.

Result

Live