'username: req.body.username' username in last of line is undefined - node.js

Question

Hello I am creating login-register system in my project, actually I made it in many of my previous projects but this time I am getting an error, for which I've seen many posts related to this but none of them worked for me.
I got some issues on "verifySignUp.js" that
"TypeError: Cannot read property 'username' of undefined"
on last 'undefined' of line 'username: req.body.username'
and This is my postman data push
{
"username":"deayhrovv",
"email":"deayhrovv#gmail.com",
"password":"123456",
"roles":["user","moderater"]
}
this is my server.js
var express = require("express");
var bodyParser = require("body-parser");
var cors = require("cors");
var dbConfig = require("./app/config/db.config");
var db = require("./app/models");
var Role = db.role;
var app = express();
// routes
require('./app/routes/auth.routes')(app);
require('./app/routes/user.routes')(app);
var corsOptions = {
origin: "http://localhost:8080"
};
db.mongoose
.connect(`mongodb://${dbConfig.HOST}:${dbConfig.PORT}/${dbConfig.DB}`, {
useNewUrlParser: true,
useUnifiedTopology: true
})
.then(() => {
console.log("Successfully connect to MongoDB.");
initial();
})
.catch(err => {
console.error("Connection error", err);
process.exit();
});
function initial() {
Role.estimatedDocumentCount((err, count) => {
if (!err && count === 0) {
new Role({
name: "user"
}).save(err => {
if (err) {
console.log("error", err);
}
console.log("added 'user' to roles collection");
});
new Role({
name: "moderator"
}).save(err => {
if (err) {
console.log("error", err);
}
console.log("added 'moderator' to roles collection");
});
new Role({
name: "admin"
}).save(err => {
if (err) {
console.log("error", err);
}
console.log("added 'admin' to roles collection");
});
}
});
}
app.use(cors(corsOptions));
// parse requests of content-type - application/json
app.use(bodyParser.json())
// parse requests of content-type - application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))
// simple route
app.get("/", (req, res) => {
res.json({ message: "Welcome to Canteen Food Order APIs application ."});
});
// set port, listen for requests
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
console.log(`Server is running on url ${corsOptions.origin}.`);
});
This is my middlewares
const { verifySignUp } = require("../middlewares");
const controller = require("../controllers/auth.controller");
module.exports = function(app) {
app.use(function(req, res, next) {
res.header(
"Access-Control-Allow-Headers",
"x-access-token, Origin, Content-Type, Accept"
);
next();
});
app.post(
"/api/auth/signup",
[
verifySignUp.checkDuplicateUsernameOrEmail,
verifySignUp.checkRolesExisted
],
controller.signup
);
app.post("/api/auth/signin", controller.signin);
};
This is my verifySignUp.js
const db = require("../models");
const ROLES = db.ROLES;
const User = db.user;
checkDuplicateUsernameOrEmail = (req, res, next) => {
User.findOne()
// Username
User.findOne({
username: req.body.username
}).exec((err, user) => {
if (err) {
res.status(500).send({ message: err });
return;
}
if (user) {
res.status(400).send({ message: "Failed! Username is already in use!" });
return;
}
// Email
User.findOne({
email: req.body.email
}).exec((err, user) => {
if (err) {
res.status(500).send({ message: err });
return;
}
if (user) {
res.status(400).send({ message: "Failed! Email is already in use!" });
return;
}
next();
});
});
};
checkRolesExisted = (req, res, next) => {
if (req.body.roles) {
for (let i = 0; i < req.body.roles.length; i++) {
if (!ROLES.includes(req.body.roles[i])) {
res.status(400).send({
message: `Failed! Role ${req.body.roles[i]} does not exist!`
});
return;
}
}
}
next();
};
const verifySignUp = {
checkDuplicateUsernameOrEmail,
checkRolesExisted
};
module.exports = verifySignUp;

Answer 1

Incase of GET request, you need to access the parameters using req.query instead of req.body. So, modify the simple route to following
app.get("/", (req, res) => {
Username = req.query.username
res.json({ message: "Welcome to Canteen Food Order APIs application ." + Username });
});