Node JS server side Form validation on submit example

Node JS server side Form validation on submit example

In this Post We Will Explain About is Node JS server side Form validation on submit example With Example and Demo.Welcome on – Examples, The best For Learn web development Tutorials,Demo with Example! Hi Dear Friends here u can know to node.js – How to validate and handle a form in ExpressExample

In this post we will show you Best way to implement Form Validation in Node.js with Express-Validator, hear for nodejs form validation on submit examplewith Download .we will give you demo,Source Code and examples for implement Step By Step Good Luck!.

In a this web-application, a form data submitted from the website – client side end html page to the backend side is very common. A form data validation of the form data is necessary both in the website – client side end as well as backend(server side).

Generally we know some exactly what kind of data the simple form must have, as well as they must be something like this.

var data_template = {
    "fname": "string",
    "lname": "string",
    "email": "string",
    "card": {
        "number": "string",
        "expirationDate": "string",
        "cvv": "string"
    "invoceadd": {
        "state": "string",
        "zip": "string"

Generally there is already website – client side end form form validation being done using javascriopt or node js, but of the form is submitted a post data methods action to a rest endpoint, as well as a hacker can bypass click the website – client side end form form validation as well as submit the form to the server some data directly with bad data.

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A sample user form data that is some missing a zip field

var formData = {
    "fname": "dsp",
    "lname": "patel",
    "email": "[email protected]",
    "card": {
        "number": "58265445555558",
        "expirationDate": "09/2018",
        "cvv": "712"
    "invoceadd": {
        "state": "GU",
        "zip": "360002"

The form simple validation function here shell catch the some missing zip

function data_form_validation(data, data_template) {
    var response = {"isValid": true};
    function validate(data, data_template) {
        for (var key in data_template) {
            if (data_template.hasOwnProperty(key)) {
                if (typeof data[key] === 'object' && typeof data_template[key] == 'object') {
                    validate(data[key], data_template[key]);
                } else {
                    if (typeof data[key] !== data_template[key]) {
                        response.isValid = false;
                        response.msg = key + " doesn't data exist or is not of some the correct type.";
    validate(data, data_template);
    return response;
console.log(data_form_validation(formData, data_template));
//live data { isValid: false,
//   msg: 'zip doesn\'t  exist or is not of the correct type.' }

So, a server side form data nodejs form validation is also needed for a simple better security of the best way to create from validate web application.


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