How to parse next-auth-generated JWT Tokens in Java and get the information in it?

Use java to decrypt next-auth generated jwt token and get information

When generating jwt tokens using next-auth, we encounter a problem: How to parse these tokens in java and get the information in it? This is a very practical requirement, especially when cross-platform verification and data extraction are required.

I generated jwt token using next-auth and set auth_secret=123456 as shown below:

 callbacks: {
    // ref: https://authjs.dev/guides/basics/role-based-access-control#persisting-the-role
    async jwt({token, user}) {
        Return token
    },
    // if you want to use the role in client components
    async session({session,user, token}) {
        Return session
    },
}

The generated jwt token is as follows:

 eyjhbgcioijkaxiilcjlbmmioijbmju2q0jdluhtntiteyiiwia2lkijoib0y4su1ycv9szuxryxhsevznzvnsuxc4vfnabnrrd1r0nmz1bnz1zzhbt2gtr2j1wkp4dnhhrllqb3fuavytrl92yz atwgxqujdarlrldkvon181vhcifq..dixteiywelvgcf5muhylqq.tscvrh0uxewydfj5g2sn_81ivsfsxpa5ffydycfw8w_n-qmyh3nbklp1cog1vbo2vbypsnormsfdi6nxzzyo264rvqsca zdmrzl1lf-hldtuxupy8kugig828p1tpeipx8huemr_h6yk7mwgmfdqw7dtzbreyvfa-mtsmykq_10gigjglhfd-yzr7en_-77gqxoaryluoaizxge8iya3tmbytds9sgn55cvvnrdycak6gy4 ptlmikw0pindsicgyzhyhjyrfb1vchzvmjwzelxpwrwbjgn52twmfc3xiowbvsfsyfvr0znt6mvdqw5lnytdq-tvucdwwm-xdrra5gw.bwaf05t99yvb1qybgbfvpik9t_zup2yq5xug26h7qng

However, when I try to parse this token with java, the error is as follows:

 static void me() {
    string jwt = "eyjhbgcioijkaxiilcjlbmmioijbmju2q0jdluhtnteyiiwia2lkijoib0y4su1ycv9szuxryxhsevznzvnsuxc4vfnabnrrd1r0nmz1bnz1zzhbt2gtr2j1wkp4dnhhrllqb3fuavytrl92yz atwgxqujdarlrldkvon181vhcifq..dixteiywelvgcf5muhylqq.tscvrh0uxewydfj5g2sn_81ivsfsxpa5ffydycfw8w_n-qmyh3nbklp1cog1vbo2vbypsnormsfdi6nxzzyo264rvqscaz dmrzl1lf-hldtuxupy8kugig828p1tpeipx8huemr_h6yk7mwgmfdqw7dtzbreyvfa-mtsmykq_10gigjglhfd-yzr7en_-77gqxoaryluoaizxge8iya3tmbytds9sgn55cvvnrdycak6gy4pt lmikw0pindsicgyzhyhjyrfb1vchzvmjwzelxpwrwbjgn52twmfc3xiowbvsfsyfvr0znt6mvdqw5lnytdq-tvucdwwm-xdrra5gw.bwaf05t99yvb1qybgbfvpik9t_zup2yq5xug26h7qng";

    try {
        // Configure the jwt parser, set the signature key and allowable algorithm claims claims = jwts.parserbuilder()
                .setsigningkey("123456") // Set the signature key.setallowedclockskewseconds(60) // Allowed time deviation (optional)
                .build()
                .parseclaimsjws(jwt) // parse token and automatically verify the signature.getbody(); // get claims object// Get the information you need from the claims object string subject = claims.getsubject();
        // ... Get other claim information system.out.println("subject: " subject);
        // ... Print other information} catch (exception e) {
        // Handle exceptions, which may be invalid signature, expired token or other problems e.printstacktrace();
    }
}

Error message:

 io.jsonwebtoken.malformedjwtexception: jwt strings must contain exactly 2 period characters. found: 4
    at io.jsonwebtoken.impl.defaultjwtparser.parse(defaultjwtparser.java:296)
    at io.jsonwebtoken.impl.defaultjwtparser.parse(defaultjwtparser.java:550)
    at io.jsonwebtoken.impl.defaultjwtparser.parseclaimsjws(defaultjwtparser.java:610)
    at io.jsonwebtoken.impl.immutablejwtparser.parseclaimsjws(immutablejwtparser.java:173)
    at com.seaurl.gatewaysvr.gatewayserverapplication.me(gatewayserverapplication.java:32)
    at com.seaurl.gatewaysvr.gatewayserverapplication.main(gatewayserverapplication.java:49)

The problem is that the token generated by next-auth is encrypted and is only for the current application. If you want to use tokens in third-party applications, you can set up a custom token in the session after logging in. For example:

 session.accessToken = your_token

In this way, we can process these tokens in java and get the information in it.

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