Node JS TypeError: Cannot read property ‘query’ of undefined - Solved

Hi Dev,

I am going to show you an example of TypeError: Cannot read property ‘query’ of undefined. you can see TypeError: Cannot read property ‘query’ of undefined - solved. I’m going to show you about TypeError: Cannot read property ‘query’ of undefined in node js. In this article, we will implement a node js TypeError: Cannot read property ‘query’ of undefined.

I will provide a simple example of finding an error cannot read property ‘query’ of undefined. In this example use CRUD in the node js application.

So, let's start solve error:

Solve Error:

app.js

var app = express()
var mysql = require('mysql');

var connection = mysql.createConnection({
    host     : 'host_name',
    user     : 'user_name',
    password : 'your_password',
    database : 'database_name'
});

connection.connect();

app.post("/add", function(request, response, next){
    
    name = request.body.name;
    price = request.body.price;
    detail = request.body.detail;

    //insert query database
    insertQuery = `INSERT INTO products (name,price,detail) VALUES ("${name}", "${price}", "${detail}")`;

    // connetion database
    connection.query(insertQuery, function(err, result) {

        request.flash('success', 'Data added successfully!')

    });
});

I hope it can help you...