Most online formatters and decoders send whatever you paste to their servers. That is a problem when the input is a production config, a customer export or a live auth token.
DevTidy does the same everyday jobs, formatting JSON, converting YAML, decoding JWTs, hashing files, testing regexes, entirely in your browser. Heavy work runs in a Web Worker so big inputs stay responsive, and nothing is uploaded.
The tools are free with no sign-up. If ads are shown they pay for hosting and never see your input.
Ideas for a new tool or found a bug? Get in touch.