express-mongo-example-project | Example project of how to structure | Runtime Evironment library

const jwt = require("jsonwebtoken");
const SECRET = "superSuperSecret";

module.exports = function(req, res, next) {
    const token = req.body.token || req.query.token || req.headers[ "x-access-token" ];
    if (token) {
        return jwt.verify(token, SECRET, function(err, decoded) {
            if (err) {
                return res.json({
                    success: false,
                    message: "Failed to authenticate token.",
                });
            }
            req.user = decoded;
            return next();
        });
    }
    return res.unauthorized();
};