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How do I read a JWT token to see what's inside it?

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#1
A JWT is three base64url parts separated by dots: header.payload.signature.

To see what's inside without touching your server:
Code:
const payload = token.split('.')[1];
const decoded = JSON.parse(atob(payload.replace(/-/g,'+').replace(/_/g,'/')));

Check the important claims: exp (expiry), iss (issuer), aud (audience), and any scopes/roles.

⚠️ Never paste a production token into an online "JWT decoder" – you're handing your session to a stranger's server. If you need a quick check, our JWT Inspector on tools.php decodes 100% in your browser (WebCrypto – nothing leaves the page).

What do you usually find in your tokens – and has one ever expired mid-request at the worst possible moment?
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