Experiencing the issue of receiving the "Cannot set headers after they are sent to the client" error message while using Express

Here is a screenshot showing the error message:

This is the code for the client-side:

API with attached jwt:

Take a look at the function used to verify the jwt:

    const authHeader = req.headers?.authorization;
    if(!authHeader){
        return res.status(401).send({message: 'Unauthorized access'})
    }
    const token = authHeader.split(' ')[1];
    jwt.verify(token, process.env.SECRET_TOKEN, (err, decoded)=>{
        if(err){
            return res.status(403).send({message: 'Forbidden access'})
        }
        console.log('decoded', decoded);
        req.decoded = decoded;
    })
    next();
}

Answer №1

The issue at hand is not associated with jwt. This error occurs when attempting to manipulate the res object post response being sent. To rectify this, consider integrating a return statement either after or in conjunction with all res.send() calls on the server side.

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