nodejs express mongoose mongodb

Question

I've created a route as a validation all my routes, I want this to handle all my requests and validate them, problem is i want to check if attributes are in the request, not the data just the attributes, lets say the user has an email but the others don't, I want to check if the body has email attribute to run a certain code to validate this email.

how do I know if the

req.body.email; 

is in the body?

var express = require('express');
var router = express.Router();


router.use('/', function(req, res, next) {
            var record = req.body.record,
                email = record.email,
                phone_number = record.phone_number,
                school_id = req.body.schoolId;

            console.log("validator");

            if (record) {

                if (what is the condition here to check
                    if the body has email)

                    req.asyncValidationErrors()
                    .then(function() {
                        next();

                    }).catch(function(errors) {
                        if (errors) {
                            res.json({
                                status: "error",
                                message: "please make sure your data is correct and your email and phone number are not valid"
                            });
                            return;
                        }
                    });
            });


        module.exports = router;

Answer 1

To know whether the email is in body, You need to check for undefined . An attribute which isn't in the body will give you undefined when accessed.

if (body.email === undefined) {
    console.log('email attribute is not in the body, hence it comes here');
    return res.json({
        status: "error",
        message: "please make sure your data is correct and your email is valid"
    });
}

If you've lodash in your app.

let _ = require('lodash');

let body = req.body;

if(_.isUndefined(body.email)) {
    console.log('email attribute is not in the body, hence it comes here');
    return res.json({
        status: "error",
        message: "please make sure your data is correct and your email is valid"
    });
}

Answer 2

Try using the npm express-validator to do all your validation on middleware.

https://www.npmjs.com/package/express-validator