Format and validate JSON and XML with inline error locations

Paste a payload and get it indented, or find out precisely why a parser refused it. The formatter reports the line and column of the failure instead of a generic syntax error, which is the difference between a five-second fix and a hunt.

Formatters — Prettify and validate JSON and XML with inline error locations. (JSON · XML)

What it does

• JSON and XML, validated properly — Both formats are parsed by the app's own parsers rather than a regex tidy-up, so a document this page accepts is a document a real parser accepts.
• Errors point at the line — A malformed document reports the failing line and column in the editor, next to the content rather than in a separate message.
• Formatted in the page — Formatting and validation happen in the page, not on a server. The document is sent anywhere only if you use an AI action, which sends it to the AI provider you chose.

What it does not do

JSON and XML only — this page does not format YAML, TOML, SQL or CSV. Naming that boundary is the point: a validator that quietly accepts what it does not understand is worse than no validator.

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