JWT Decoder Online
Free online JWT decoder for developers to inspect header and payload claims without verifying signatures.
Ad Space
Free online JWT decoder for developers to inspect header and payload claims without verifying signatures.
How it works
This tool splits a JWT into parts and Base64URL-decodes the header and payload. It helps debug authentication and token contents.
Example
Input:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMifQ.signature
Output:
Header: {"alg":"HS256","typ":"JWT"}
Payload: {"sub":"123"}FAQ
Does decoding verify the signature?
No. Decoding only shows contents. Signature verification requires the correct key and algorithm.
What is Base64URL?
A URL-safe Base64 variant used by JWT that replaces characters and often removes padding.
Ad Space
Related Tools
- JWT Generator OnlineFree online JWT builder for local auth testing—never paste real production secrets into untrusted sites.
- MD5 & SHA Hash Generator OnlineFree online hash generator for MD5, SHA-1, and SHA-256 digests to checksum strings and debug data.
- Secure Password Generator OnlineFree online password generator that creates long, random secrets with symbols for stronger accounts.
- JWT Claims Inspector OnlineFree online helper that surfaces exp, nbf, aud, iss, and related JWT timing claims for auth debugging.