You've seen them — long strings of three dot-separated chunks pasted into Slack, debug logs, and API...
You've seen them — long strings of three dot-separated chunks pasted into Slack, debug logs, and API playgrounds everywhere. JWT tokens are the backbone of modern authentication, but most developers treat them as opaque blobs. Let's open one up.
What a JWT actually is
A JWT (JSON Web Token) is three Base64URL-encoded segments joined by dots:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
.eyJzdWIiOiJ1c2VyXzEyMyIsIm5hbWUiOiJKYW5lIERvZSIsInJvbGUiOiJhZG1pbiIsImlhdCI6MTcxNjIzMDAwMCwiZXhwIjoxNzE2MjMzNjAwfQ
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