About This Launch
JFmt is a free online JSON formatter, validator and viewer that runs in your browser. It can beautify, minify, validate, repair, escape, unescape and sort JSON, run JSONPath queries, diff and compare, and convert to and from CSV, Excel, XML, YAML, TOML, SQL and code models for Java, C#, Go and Dart. It also decodes and creates JWTs.
There are no accounts, no uploads and no history, and auto-save is off by default. The page lists no paid tiers.
Why I Built This
Developers often need to format or validate JSON without uploading it or creating an account. We built JFmt so formatting, validation, repair, JSONPath queries, diffs, and conversion all stay in the browser.
Launch Details
CategoryDeveloper Tools
StageLive
ListedOctober 24, 2026