2.1.X

Custom Error Handling

There are three types of errors:

  • Unauthorised: This is when the user has been logged out, or session has expired.
  • Try Refresh Token: This is when the access token has expired, and you need to refresh the session.
  • Token theft detected: This is thrown in case a user is being attacked. You can us this to revoke their affected session.

Define error handlers using the supertokens.errorHandler() middleware

app.use(supertokens.errorHandler({
    onUnauthorised?: (err, req, res, next) => void,
    onTryRefreshToken?: (err, req, res, next) => void,
    onTokenTheftDetected?: (sessionHandle, userId, req, res, next) => void
}));
  • All auth cookies are cleared when onUnauthorised and onTokenTheftDetected is called.
  • You should respond with the same session expired HTTP status code for onUnauthorised and onTryRefreshToken. By default, this value is 440.
  • sessionHandle is like a session identifier (unique per session). Using this, you can revoke this session. Learn more about this here.
  • By default, onTokenTheftDetected revokes the affected session and returns the session expired status code.
  • You do not need to provide all the callbacks.

Example

let supertokens = require("supertokens-node");

let app = express();

// add all your routes here...

// add SuperTokens error middleware
app.use(supertokens.errorHandler({
    onUnauthorised: (err, req, res, next) => {
        logging.logError(err);  // some logging module
        res.status(440).send("Please login again");
    },
    onTryRefreshToken: (err, req, res, next) => {
        res.status(440).send("Call the refresh API");
    },
    onTokenTheftDetected: async (sessionHandle, userId, req, res, next) => {
        res.status(440).send("You are being attacked");
        await supertokens.revokeSession(sessionHandle);       
    }
}));

// add your error middleware
app.use((err, req, res, next) => {
    res.send(500).send(err);
})
import * as supertokens from "supertokens-node";

let app = express();

// add all your routes here...

// add SuperTokens error middleware
app.use(supertokens.errorHandler({
    onUnauthorised: (err, req, res, next) => {
        logging.logError(err);  // some logging module
        res.status(440).send("Please login again");
    },
    onTryRefreshToken: (err, req, res, next) => {
        res.status(440).send("Call the refresh API");
    },
    onTokenTheftDetected: async (sessionHandle, userId, req, res, next) => {
        res.status(440).send("You are being attacked");
        await supertokens.revokeSession(sessionHandle);       
    }
}));

// add your error middleware
app.use((err, req, res, next) => {
    res.send(500).send(err);
})
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