Using mongoose promises with async/await

Question

I\'m trying to get the hang of using Mongoose promises with the async/await functionality of Node.js. When my function printEmployees is called I want to save t

Answer 1

if you're going to use async/await then it works like this.

• await in front of the function that returns a promise.
• async in front of the wrapping function.
• wrap the function body inside try/catch block.

Please have a look on this function, it is a middleware before i execute a specific route in express.

const validateUserInDB = async (req, res, next) => {
    try {
        const user = await UserModel.findById(req.user._id);
        if (!user) return res.status(401).json({ message: "Unauthorized." });
        req.user = user;
        return next();
    } catch (error) {
        return res.status(500).json({ message: "Internal server error." })
    }
}

• The code after await is waiting the promise to be resolved.
• Catch block catches any error happened inside the try block even if the error that is triggered by catch method comes from awaiting promise.