JSON5 formatter

Format comments, quoted keys and trailing commas.

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JSON5 formatter processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Updated 2026-09-20

JSON5 formatter explained

Format JSON5 with its own grammar, including comments, unquoted property names, single-quoted strings and trailing commas. The output is parsed a second time to confirm stable formatting. Code is never executed.

Next: JavaScript formatter

A worked example

{a:1,} is valid JSON5 and can be formatted. {a:} is missing a value and produces a syntax error. Neither example is strict JSON as written.

Before you use the result

Formatting only, not conversion to strict JSON or duplicate-key validation. JSON5 permits NaN and Infinity; strict JSON does not. Comments and values remain in the JSON5 document. No script, expression evaluation or remote input is supported.

Next: JSON formatter

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ToolOctopus. “JSON5 formatter.” Updated 2026-09-20. https://tooloctopus.com/json5-formatter.

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