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<title>Email validation with Javascript</title>
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body { padding: 5%; }
#email { margin-bottom: 20px; }
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<h1>Email validation with Javascript</h1>
<p>Simple demo which passes email address to the API on form submit and shows a message based on response.</p>
<p>Including showing alternative suggestions for common typos such as instead of</p>
<p><a href="">Full email validation API documentation</a></p>
<form id="example_form">
<div class="form-group">
<label for="email">Email address</label>
<input type="email" class="form-control" id="email" placeholder="Email address" aria-required="true" aria-invalid="false" required>
<button type="submit" class="btn btn-default" id="validate">Validate</button>
// Replace with your API key, test key will always return true regardless of email address
var api_key = "PCW45-12345-12345-1234X";
var example_form = document.getElementById("example_form");
example_form.addEventListener("submit", function(e) {
var email_field = document.getElementById("email");
function validate_email(element) {
// Grab the input text and trim any whitespace
var email_address = element.value.trim();
if (email_address != "") {
// Remove any previous validation results
var email_valid = document.getElementById("email_valid");
if(email_valid) { email_valid.remove(); }
// Create a template bootstrap alert div
var response_html = document.createElement("div");
response_html.setAttribute("class", "alert");
response_html.setAttribute("role", "alert");
response_html.setAttribute("id", "email_valid");
// Create the URL including API key and encoded email address
var email_url = "" + api_key + "/emailaddress/" + encodeURIComponent(email_address);
// Create a loading message
var loading_html = document.createElement("div");
loading_html.textContent = "Validating email address...";
element.insertAdjacentElement("afterend", loading_html);
// Call the API
var email_request = new XMLHttpRequest();"GET", email_url, true);
email_request.onload = function () {
if (email_request.status >= 200 && email_request.status < 400) {
var data = JSON.parse(email_request.responseText);
if(data.alternative) {
// Add relevant class and message to alert template
response_html.textContent = "Did you mean: " + data.alternative + "? ";
// Different role for ARIA, as the alert has an interactive element
response_html.setAttribute("role", "alertdialog");
// Create a button to help user swap to suggestion easily
var change_button = document.createElement("button");
change_button.setAttribute("class", "btn btn-default");
change_button.setAttribute("type", "button");
change_button.textContent = "Yes";
change_button.onclick = function(e) {
// Swaps the current input for the suggestion and re-run validation
element.value = data.alternative;
// Add button to alert template
// Add alert to page after email field element
element.insertAdjacentElement("afterend", response_html);
} else {
if(data.valid === true) {
// Add relevant class and message to alert template
response_html.textContent = "Email address valid";
// Add alert to page after email field element
element.insertAdjacentElement("afterend", response_html);
// Set ARIA-invalid attribute of field to false (means it is NOT invalid)
element.setAttribute("aria-invalid", "false");
// Note: If "score" is less 100, it may be a generic sales@ mailbox, disposable email address or a catch all server
// More info -
} else {
// Add relevant class and message to alert template
response_html.textContent = "Email address not valid: " + data.state;
// Add alert to page after email field element
element.insertAdjacentElement("afterend", response_html);
// Set ARIA-invalid attribute of field to true (means it IS invalid)
element.setAttribute("aria-invalid", "true");
// Full list of "state" responses -
} else {
// Triggered if API does not return HTTP code between 200 and 399
// More info -
email_request.onerror = function() {
// Triggered if API cannot be reached
// More info -