J
Web product
Added October 24, 2026
About the product
JFmt (jfmt.dev) is a free online JSON formatter, validator, and viewer that runs entirely in your browser (Web Worker) — nothing is uploaded, no account is needed, and no history is stored. It can format, minify, validate, repair, escape, sort keys, run JSONPath queries, and diff two documents, and view data as a tree or mind map. It converts between JSON and CSV/Excel, XML, YAML, TOML, query strings, and Postman collections, and can generate SQL and model code for Java, C#, Go, and Dart. The UI supports 10 languages.
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