Nowadays, the process of registering for web applications has become increasingly simpler. Applications obtain most of the information they need during the registration process from our ID number, email address, and even third-party applications if we use them during registration.

Nowadays, applications such as e-commerce, banking, or finance applications, where transactions require precision, request a phone number from us during registration for many security purposes. After the applications check the users’ phone numbers with a phone number validator API, they obtain detailed information about the number from a free phone number lookup API.

Integrating a Free Phone Number

Phone number validation and lookup operations are carried out in many web applications today. APIs that provide this service generally support phone numbers from more than one country and query the verification of phone numbers from the official telecommunication providers of the relevant countries.

There are many advantages that these APIs provide to applications. In this article, we will talk about their advantages. Then, we will develop a web application with an API that provides both phone number validation and lookup services.

What are the Advantages of Using a Phone Number Validation and Lookup API in Your Web Application?

While considering the advantages of using phone number verification and query APIs in web applications, user security, data accuracy, and effective communication have gained particular importance in today’s digital age.

These APIs are used to verify the phone numbers that users provide when registering or logging into your web application and to get detailed information about these numbers.

These APIs provide businesses with the advantage of preventing the creation of fake accounts, minimizing data entry errors, increasing account security, and improving user experience.

Therefore, considering these APIs as a core component of your web application allows you to increase the security and satisfaction of your users. In this section, we will take a closer look at the benefits of these APIs.

User Authentication

Phone number validation APIs help you quickly verify the phone numbers that users provide when registering or logging in. In this way, you can easily increase account security and prevent the creation of fake accounts.


These APIs check whether phone numbers are real and valid. This prevents incorrect or incomplete information entries and reduces the possibility of communication errors.

Data Richness

APIs provide additional information about phone numbers. For example, you can retrieve data such as line type, carrier, location, and other details of a phone number. This allows you to enrich user profiles and deliver personalized experiences.


Phone numbers can be used as part of security measures such as two-factor authentication (2FA). In this way, you can ensure that your users’ accounts are more secure. You can also quickly block malicious logins.

Marketing and Communications

Phone number data can be used to identify target audiences for marketing campaigns. It is possible to obtain location information of phone numbers with the phone number lookup service. More effective marketing strategies can be developed with this location data.

Fraud Prevention

Phone number verification and querying can be used to detect and block fraud attempts. It can help prevent fraud, especially in financial transactions and online shopping.

How to Integrate a Free Phone Number Lookup API to Web Form?

In this section, we will integrate an API that provides validation and lookup services together into the web form. With this application, we will simulate the registration process on a user registration screen.

In this application, we will obtain the user’s information from a web form, and after the user enters his phone number in the relevant field and press the ‘Register’ button, we will automatically fill in the Country and Location fields.

We will use the numverify API to develop this application. The numverify API is a global phone number validation & lookup JSON API that supports phone numbers from 232 countries. We will follow the steps below to develop a web application with this API.

Get an API Key

We need an API key to integrate and use this API with any programming language. For this, let’s sign up for the free subscription plan offered by the numverify API and obtain an API key. This API offers a limit of 1,000 API calls with the free plan.


Let’s create an HTML file to develop the application and put the following code:

<!DOCTYPE html>
<html lang=”en”>
<meta charset=”UTF-8″>
<meta name=”viewport” content=”width=device-width, initial-scale=1.0″>
<link rel=”stylesheet” href=””>
<title>Phone Number Lookup</title>
<div class=”container mt-5″>
<h1 class=”mb-4″>User Registration</h1>
<form id=”registrationForm”>
<div class=”form-group”>
<label for=”firstName”>First Name</label>
<input type=”text” class=”form-control” id=”firstName” required>
<div class=”form-group”>
<label for=”lastName”>Last Name</label>
<input type=”text” class=”form-control” id=”lastName” required>
<div class=”form-group”>
<label for=”email”>Email</label>
<input type=”email” class=”form-control” id=”email” required>
<div class=”form-group”>
<label for=”phoneNumber”>Phone Number</label>
<input type=”tel” class=”form-control” id=”phoneNumber” required>
<div class=”form-group”>
<label for=”country”>Country</label>
<input type=”text” class=”form-control” id=”country” readonly>
<div class=”form-group”>
<label for=”location”>Location</label>
<input type=”text” class=”form-control” id=”location” readonly>
<button type=”submit” class=”btn btn-primary”>Register</button>

<script src=””></script>
<script src=””></script>
<script src=””></script>
const registrationForm = document.getElementById(“registrationForm”);

registrationForm.addEventListener(“submit”, function (e) {
const phoneNumberInput = document.getElementById(“phoneNumber”);
const countryInput = document.getElementById(“country”);
const locationInput = document.getElementById(“location”);

// Replace ‘YOUR_API_KEY’ with your actual API key
const apiKey = ‘API-KEY’;
const phoneNumber = phoneNumberInput.value;

// Make a request to the API
.then(response => response.json())
.then(data => {
if (data.valid) {
countryInput.value = data.country_name;
locationInput.value = data.location;

//Submit the form
} else {
alert(“Invalid phone number.”);
.catch(error => {
console.error(“Error:”, error);
alert(“An error occurred while fetching data.”);

Let’s put our API key in the ‘API-KEY’ field in this code.


Now, we can test the application. When we start the application, the following page will open:

Integrating a Free Phone Number

After filling in the relevant fields in this web form and pressing the ‘Register’ button, the Location and Country fields below will be automatically filled in as follows:

Integrating a Free Phone Number


In summary, integrating a free phone number verification system into the web form provides many advantages to businesses. They provide an important service that improves their users’ experience while increasing data accuracy by streamlining the process of verifying their users’ Phone number validation API Thanks to this integration, users can complete the registration process quickly and smoothly.


Q: Is numverify a Free Phone Number Lookup Service?

A: Yes, numverify is a free phone number lookup service. It offers a free subscription plan that can be used to perform basic phone number verification and querying.

Q: What Are the Main Benefits of Using a Phone Number Lookup?

A: The main advantages of using the phone number lookup service are that it helps users increase data accuracy, prevent fake accounts, and minimize communication errors. It can also deliver personalized experiences by providing access to additional data such as geolocation information and carrier information.

Q: Does the numverify API Provide Both Validation and Lookup Services?

A: Yes, it does. The numverify API provides both phone number verification and query services. With this API, you can check the validity of a given phone number and also access information associated with that phone number, such as country, geographic location, and carrier.

Q: What Should I Pay Attention to When Choosing a Free Phone Number Lookup?

A: Here are some things to consider when choosing a free phone number inquiry service:

● Data Accuracy
● Reliability
● Speed

While collecting information during the registration process offers various benefits, it’s essential for companies to prioritize user privacy, data security, and compliance with relevant regulations, such as the General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA). Users should be informed about how their data will be used, stored, and protected, and given the option to consent to specific data processing activities.

Furthermore, companies should implement robust security measures, such as encryption, access controls, and regular security audits, to safeguard user information against unauthorized access, data breaches, and misuse. Transparency, accountability, and user-centric design principles should guide the collection and handling of user data throughout the registration process and beyond.

In summary, while collecting information such as ID numbers, email addresses, and third-party authentication data during the registration process is essential for identity verification, personalization, and user convenience, it’s imperative for companies to prioritize user privacy, data security, and compliance with regulations to build trust and foster positive user experiences.