Base64 Encode for JWT Token Parts
Quick Answer: JWT tokens use Base64url encoding (URL-safe, no padding) for the header and payload sections. Paste your JSON header or claims object to get the Base64url-encoded string used in JWT construction.
FAQ
What is the difference between Base64 and Base64url?
Base64url replaces + with -, / with _, and removes = padding. This makes the output safe for URLs and JWT tokens.
Do I need Base64url for JWTs?
Yes. JWT specification (RFC 7519) requires Base64url encoding, not standard Base64. Using standard Base64 will produce invalid tokens.