formatly

Paste JSON, YAML, or XML — format it, validate it, or diff two versions. Nothing leaves this tab.

Formatly is a free online JSON formatter, YAML formatter, and XML formatter that also validates your data and highlights syntax errors as you go. Paste minified or messy JSON to instantly pretty-print it, switch tabs to compare two versions of a config file line by line, or convert between formats without installing anything. Everything runs in your browser using JavaScript — no file is ever uploaded to a server, which makes it safe to use with real API keys, credentials, or internal data.

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Formatted output appears here