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I need to extract claims from a JWT.
It seems that this should be a no-brainer.
It was signed, from the header I get:
{
"alg": "RS256",
"typ": "JWT"
}
JWT:
eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX25hbWUiOiJtYXJrLnN0YW5nQGRoaWdyb3VwaW5jLmNvbSIsInNjb3BlIjpbIm9wZW5pZCJdLCJyb2xlcyI6WyJKT0JTRUVLRVIiXSwiam9ic2Vla2VySWQiOiJ3TDFkTWdQckZWOUl5dEZZIiwiZXhwIjoxNDg4Mzk1ODE5LCJhdXRob3JpdGllcyI6WyJKT0JTRUVLRVIiXSwianRpIjoiNWRiYjNkYzQtNGI3NC00MDYyLTgzMmQtYjE1MTgwYWZhZjllIiwiY2xpZW50X2lkIjoiZWZjIn0.NxiF4x39na3KdDUFz2zxqy1zSfJkj4FdKHflpgJUxzMgBq8bbJIFVkmwAUYA6_YXm6kGFcyTMgdiRIJpqc5buDPdV1vkzh4QKFTxMz9MF4i3vtIQ21Vm5W12KikWdWGGUXMD4udJwu7rmuIBtNIa-ciZOPADNrrXfuw7iML1xxAA-C0f4OTbiKqiXr3QEUZwcqZB17qfh_dVRRxgO-_uHUg84JDcpXEDQPzPWX68u1EHH4J6IcpMKn1VY9k3RcZU6pq-ndzQgBlKdVm2owA6i-UM9p1zSz7ZX_2wx0czEEcNF1rMdeIv5yxP9YEpWb14-GUG4qgpn_rAIQBJ7eu7xw
It decodes on the jwt.io site just fine, but since I don't have the "secret" key, it comes up as "invalid signature". Which is fine, I am not trying to validate it.
All I want is the claims but when I use a Java library to decode it I get nothing but errors.
If I decode it manually (i.e. split/base64 decode) it is fine.
So, what am I doing wrong with the Java libraries?
356
To verify JWT claimsVerify that the token is not expired. The aud claim in an ID token and the client_id claim in an access token should match the app client ID that was created in the Amazon Cognito user pool. The issuer ( iss ) claim should match your user pool.
Once you start using JWTs you start hearing the word "claim" everywhere. A JWT claim is a key/value pair in a JSON object. In the example above, "name": "Joe Coder" , the claim key is name and the value is Joe Coder . The value of a claim can be any JSON object.
JWT claims Claims constitute the payload part of a JSON web token and represent a set of information exchanged between two parties. The JWT standard distinguishes between reserved claims, public claims, and private claims. In API Gateway context, both public claims and private claims are considered custom claims.
In a JWT, a claim appears as a name/value pair where the name is always a string and the value can be any JSON value. Generally, when we talk about a claim in the context of a JWT, we are referring to the name (or key).
Once the question is tagged with jose4j, I understand you are using jose4j for parsing JWT tokens.
In this situation, you can invoke setSkipSignatureVerification() from the JwtConsumerBuilder. It allows you to parse the claims without validating the signature:
JwtConsumer jwtConsumer = new JwtConsumerBuilder()
.setSkipSignatureVerification()
.build();
JwtClaims jwtClaims = jwtConsumer.processToClaims(jwt);
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