Developer Releases Free Browser-Only JWT Creator With HMAC Signing and 77 Tests

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A developer has released a free, client-side JWT Creator and Signer tool that runs entirely in the browser using the Web Crypto API. The tool supports HMAC signing algorithms HS256, HS384, and HS512, and allows users to create, sign, and verify JSON Web Tokens without sending any data to a server. Key features include quick claim insertion buttons, random 256-bit secret generation, expiry checking, and color-coded token output. The tool is available at devnestio.pages.dev and comes backed by 77 passing tests covering encoding, JWT structure, algorithm mapping, and error states. Its fully client-side design ensures that sensitive signing secrets remain local to the user's browser at all times.

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