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How to Decode and Verify a JWT in Your Browser (Without Pasting It Into a Server)

By Alok Singh · DEV Community · 10/28/2026

Originally published at https://bestlatestapps.com/blog/decode-and-verify-a-jwt-in-your-browser/ . Sooner or later every app developer stares at a 401 and a token that looks like eyJhbGciOi... . Is it expired? Is the audience wrong? Was it signed with the key you think it was? You could decode it…

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