Subscribe

Vanilla JavaScript Email Validation

✍️

In this tutorial we are learning how to validate an email address in JavaScript with Regex. Follow the steps and see the live demo on Codepen.

13 Aug, 2020 Β· 2 min read

Today I want to address a topic I use pretty often but noticed I've never written about:

Email validation.

Since my day job is in marketing, we build many pages with forms, and the least we need is an email address. So how do we ensure the email input is a valid email address with pure JavaScript?

HTML Structure

We'll use a straightforward form for today's work, with only an email input and a button to submit. Then we'll have a response div to show us if the email was correct.

<div class="container">
  <input type="email" id="emailField" />
  <br />
  <button id="button">Check validation</button>
  <div id="response"></div>
</div>

JavaScript Validating an Email Address

Ok, now on to the fun part, the JavaScript! Let's start by defining the variables we need to validate the email:

const emailField = document.getElmentById('emailField');
const button = document.getElementById('button');
const response = document.getElementById('response');

Fantastic, very basic CSS selectors, but enough for this exercise.

Now we want to add a click listener to the button element.

button.addEventListener('click', function () {
  const email = emailField.value;
  console.log(email);
});

This function will log the value from the input field to the console.

So now let's make our actual validation function to check if it validates correctly:

function validateEmail(email) {
  const re =
    /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  return re.test(String(email).toLowerCase());
}

BAM! Please don't be scared; it's a plain old regular expression. This will validate a valid email format.

It will return true or false, depending on the email.

So let's implement this into our button click function.

button.addEventListener('click', function () {
  const email = emailField.value;
  if (validateEmail(email)) {
    response.innerHTML = 'Hiya Cowboy, this email will work for us 🀠';
  } else {
    response.innerHTML = 'Sorry, this email is not cool enough 😩';
  }
});

There we go! This is how you validate email inputs in a form with Regex. Of course, you would like to do something with this information, but I'll leave that up to you!

View the example code in this Codepen

See the Pen Vanilla JavaScript Email Validation by Chris Bongers (@rebelchris) on CodePen.

Thank you for reading, and let's connect!

Thank you for reading my blog. Feel free to subscribe to my email newsletter and connect on Facebook or Twitter

Spread the knowledge with fellow developers on Twitter
Tweet this tip
Powered by Webmentions - Learn more

Read next πŸ“–

JavaScript sending data between windows

9 Sep, 2022 Β· 4 min read

JavaScript sending data between windows

Using the native payment request JavaScript API

9 Aug, 2022 Β· 8 min read

Using the native payment request JavaScript API

Join <html><head><script data-ezscrex='false' data-cfasync='false' data-pagespeed-no-defer>var __ez=__ez||{};__ez.stms=Date.now();__ez.evt={};__ez.script={};__ez.ck=__ez.ck||{};__ez.template={};__ez.template.isOrig=true;__ez.queue=function(){var e=0,i=0,t=[],n=!1,s=[],r=[],o=!0,a=function(e,i,n,s,r,o,a){var l=this;this.name=e,this.funcName=i,this.parameters=null===n?null:n instanceof Array?n:[n],this.isBlock=s,this.blockedBy=r,this.deleteWhenComplete=o,this.isError=!1,this.isComplete=!1,this.isInitialized=!1,this.proceedIfError=a,this.isTimeDelay=!1,this.process=function(){u("... func = "+e),l.isInitialized=!0,l.isComplete=!0,u("... func.apply: "+e);var i=l.funcName.split("."),n=null;i.length>3||(n=3===i.length?window[i[0]][i[1]][i[2]]:2===i.length?window[i[0]][i[1]]:window[l.funcName]),null!=n&&n.apply(null,this.parameters),!0===l.deleteWhenComplete&&delete t[e],!0===l.isBlock&&(u("----- F'D: "+l.name),f())}},l=function(e,i,t,n,s,r,o){var a=this;this.name=e,this.path=i,this.async=s,this.defer=r,this.isBlock=t,this.blockedBy=n,this.isInitialized=!1,this.isError=!1,this.isComplete=!1,this.proceedIfError=o,this.isTimeDelay=!1,this.isPath=function(e){return"/"===e[0]&&"/"!==e[1]},this.getSrc=function(e){return void 0!==window.__ezScriptHost&&this.isPath(e)?window.__ezScriptHost+e:e},this.process=function(){a.isInitialized=!0,u("... file = "+e);var i=document.createElement("script");i.src=this.getSrc(this.path),!0===s?i.async=!0:!0===r&&(i.defer=!0),i.onerror=function(){u("----- ERR'D: "+a.name),a.isError=!0,!0===a.isBlock&&f()},i.onreadystatechange=i.onload=function(){var e=i.readyState;u("----- F'D: "+a.name),e&&!/loaded|complete/.test(e)||(a.isComplete=!0,!0===a.isBlock&&f())},document.getElementsByTagName("head")[0].appendChild(i)}},c=function(e,i){this.name=e,this.path="",this.async=!1,this.defer=!1,this.isBlock=!1,this.blockedBy=[],this.isInitialized=!0,this.isError=!1,this.isComplete=i,this.proceedIfError=!1,this.isTimeDelay=!1,this.process=function(){}};function d(e){!0!==h(e)&&0!=o&&e.process()}function h(e){if(!0===e.isTimeDelay&&!1===n)return u(e.name+" blocked = TIME DELAY!"),!0;if(e.blockedBy instanceof Array)for(var i=0;i<e.blockedBy.length;i++){var s=e.blockedBy[i];if(!1===t.hasOwnProperty(s))return u(e.name+" blocked = "+s),!0;if(!0===e.proceedIfError&&!0===t[s].isError)return!1;if(!1===t[s].isComplete)return u(e.name+" blocked = "+s),!0}return!1}function u(e){var i=window.location.href,t=new RegExp("[?&]ezq=([^&#]*)","i").exec(i);"1"===(t?t[1]:null)&&console.debug(e)}function f(){++e>200||(u("let's go"),m(s),m(r))}function m(e){for(var i in e)if(!1!==e.hasOwnProperty(i)){var t=e[i];!0===t.isComplete||h(t)||!0===t.isInitialized||!0===t.isError?!0===t.isError?u(t.name+": error"):!0===t.isComplete?u(t.name+": complete already"):!0===t.isInitialized&&u(t.name+": initialized already"):t.process()}}return window.addEventListener("load",(function(){setTimeout((function(){n=!0,u("TDELAY -----"),f()}),5e3)}),!1),{addFile:function(e,i,n,o,a,c,h,u){var f=new l(e,i,n,o,a,c,h);!0===u?s[e]=f:r[e]=f,t[e]=f,d(f)},addDelayFile:function(e,i){var n=new l(e,i,!1,[],!1,!1,!0);n.isTimeDelay=!0,u(e+" ... FILE! TDELAY"),r[e]=n,t[e]=n,d(n)},addFunc:function(e,n,o,l,c,h,u,f,m){!0===h&&(e=e+"_"+i++);var p=new a(e,n,o,l,c,u,f);!0===m?s[e]=p:r[e]=p,t[e]=p,d(p)},addDelayFunc:function(e,i,n){var s=new a(e,i,n,!1,[],!0,!0);s.isTimeDelay=!0,u(e+" ... FUNCTION! TDELAY"),r[e]=s,t[e]=s,d(s)},items:t,processAll:f,setallowLoad:function(e){o=e},markLoaded:function(e){if(e&&0!==e.length){if(e in t){var i=t[e];!0===i.isComplete?u(i.name+" "+e+": error loaded duplicate"):(i.isComplete=!0,i.isInitialized=!0)}else t[e]=new c(e,!0);u("markLoaded dummyfile: "+t[e].name)}},logWhatsBlocked:function(){for(var e in t)!1!==t.hasOwnProperty(e)&&h(t[e])}}}();__ez.evt.add=function(e,t,n){e.addEventListener?e.addEventListener(t,n,!1):e.attachEvent?e.attachEvent("on"+t,n):e["on"+t]=n()},__ez.evt.remove=function(e,t,n){e.removeEventListener?e.removeEventListener(t,n,!1):e.detachEvent?e.detachEvent("on"+t,n):delete e["on"+t]};__ez.script.add=function(e){var t=document.createElement("script");t.src=e,t.async=!0,t.type="text/javascript",document.getElementsByTagName("head")[0].appendChild(t)};__ez.dot={};__ez.queue.addFile('/detroitchicago/boise.js', '/detroitchicago/boise.js?gcb=195-0&cb=2', true, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/memphis.js', '/detroitchicago/memphis.js?gcb=195-0&cb=21', true, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/minneapolis.js', '/detroitchicago/minneapolis.js?gcb=195-0&cb=4', true, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/rochester.js', '/detroitchicago/rochester.js?gcb=195-0&cb=13', false, ['/detroitchicago/memphis.js','/detroitchicago/minneapolis.js'], true, false, true, false);!function(){var e;__ez.vep=(e=[],{Add:function(i,t){__ez.dot.isDefined(i)&&__ez.dot.isValid(t)&&e.push({type:"video",video_impression_id:i,domain_id:__ez.dot.getDID(),t_epoch:__ez.dot.getEpoch(0),data:__ez.dot.dataToStr(t)})},Fire:function(){if(void 0===document.visibilityState||"prerender"!==document.visibilityState){if(__ez.dot.isDefined(e)&&e.length>0)for(;e.length>0;){var i=5;i>e.length&&(i=e.length);var t=e.splice(0,i),o=__ez.dot.getURL("/detroitchicago/grapefruit.gif")+"?orig="+(!0===__ez.template.isOrig?1:0)+"&v="+btoa(JSON.stringify(t));__ez.dot.Fire(o)}e=[]}}})}();</script><script data-ezscrex='false' data-cfasync='false' data-pagespeed-no-defer>!function(){function e(i){return e="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},e(i)}__ez.pel=function(){var i=[];function t(t,o,d,_,n,r,a,s){if(__ez.dot.isDefined(t)&&0!=__ez.dot.isAnyDefined(t.getSlotElementId,t.ElementId)){void 0===s&&(s=!1);var p=parseInt(__ez.dot.getTargeting(t,"ap")),f=__ez.dot.getSlotIID(t),u=__ez.dot.getAdUnit(t,s),z=parseInt(__ez.dot.getTargeting(t,"compid")),g=0,c=0,l=function(i){if("undefined"==typeof _ezim_d)return!1;var t=__ez.dot.getAdUnitPath(i).split("/").pop();if("object"===("undefined"==typeof _ezim_d?"undefined":e(_ezim_d))&&_ezim_d.hasOwnProperty(t))return _ezim_d[t];for(var o in _ezim_d)if(o.split("/").pop()===t)return _ezim_d[o];return!1}(t);"object"==e(l)&&(void 0!==l.creative_id&&(c=l.creative_id),void 0!==l.line_item_id&&(g=l.line_item_id)),__ez.dot.isDefined(f,u)&&__ez.dot.isValid(o)&&("0"===f&&!0!==s||""===u||i.push({type:"impression",impression_id:f,domain_id:__ez.dot.getDID(),unit:u,t_epoch:__ez.dot.getEpoch(0),revenue:d,est_revenue:_,ad_position:p,ad_size:"",bid_floor_filled:n,bid_floor_prev:r,stat_source_id:a,country_code:__ez.dot.getCC(),pageview_id:__ez.dot.getPageviewId(),comp_id:z,line_item_id:g,creative_id:c,data:__ez.dot.dataToStr(o),is_orig:s||__ez.template.isOrig}))}}function o(){void 0!==document.visibilityState&&"prerender"===document.visibilityState||(__ez.dot.isDefined(i)&&i.length>0&&[i.filter((function(e){return e.is_orig})),i.filter((function(e){return!e.is_orig}))].forEach((function(e){for(;e.length>0;){var i=e[0].is_orig||!1,t=5;t>e.length&&(t=e.length);var o=e.splice(0,t),d=__ez.dot.getURL("/porpoiseant/army.gif")+"?orig="+(!0===i?1:0)+"&sts="+btoa(JSON.stringify(o));(void 0!==window.isAmp&&isAmp||void 0!==window.ezWp&&ezWp)&&void 0!==window._ezaq&&_ezaq.hasOwnProperty("domain_id")&&(d+="&visit_uuid="+_ezaq.visit_uuid),__ez.dot.Fire(d)}})),i=[])}return{Add:t,AddAndFire:function(e,i){t(e,i,0,0,0,0,0),o()},AddAndFireOrig:function(e,i){t(e,i,0,0,0,0,0,!0),o()},AddById:function(e,t,o,d){var _=e.split("/");if(__ez.dot.isDefined(e)&&3===_.length&&__ez.dot.isValid(t)){var n=_[0],r={type:"impression",impression_id:_[2],domain_id:__ez.dot.getDID(),unit:n,t_epoch:__ez.dot.getEpoch(0),pageview_id:__ez.dot.getPageviewId(),data:__ez.dot.dataToStr(t),is_orig:o||__ez.template.isOrig};void 0!==d&&(r.revenue=d),i.push(r)}},Fire:o,GetPixels:function(){return i}}}()}();__ez.queue.addFile('/detroitchicago/raleigh.js', '/detroitchicago/raleigh.js?gcb=195-0&cb=6', false, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/tampa.js', '/detroitchicago/tampa.js?gcb=195-0&cb=5', false, [], true, false, true, false);</script> <script data-ezscrex="false" data-cfasync="false">(function(){if("function"===typeof window.CustomEvent)return!1;window.CustomEvent=function(c,a){a=a||{bubbles:!1,cancelable:!1,detail:null};var b=document.createEvent("CustomEvent");b.initCustomEvent(c,a.bubbles,a.cancelable,a.detail);return b}})();</script><script data-ezscrex="false" data-cfasync="false">__ez.queue.addFile('/detroitchicago/tulsa.js', '/detroitchicago/tulsa.js?gcb=195-0&cb=7', false, [], true, false, true, false);</script><script type="text/javascript">var ezouid = "1";</script><base href="https://sendy.daily-dev-tips.com/api/subscribers/active-subscriber-count.php"><script type='text/javascript'> var ezoTemplate = 'old_site_noads'; if(typeof ezouid == 'undefined') { var ezouid = 'none'; } var ezoFormfactor = '1'; var ezo_elements_to_check = Array(); </script> <script data-ezscrex="false" type='text/javascript'> var soc_app_id = '0'; var did = 408517; var ezdomain = 'daily-dev-tips.com'; var ezoicSearchable = 1; </script> <script data-ezscrex="false" type="text/javascript" data-cfasync="false">var _ezaq = {"ad_cache_level":0,"ad_lazyload_version":0,"ad_load_version":0,"city":"The Dalles","country":"US","days_since_last_visit":-1,"domain_id":408517,"engaged_time_visit":0,"ezcache_level":1,"ezcache_skip_code":8,"form_factor_id":1,"framework_id":1,"is_return_visitor":false,"is_sitespeed":0,"last_page_load":"","last_pageview_id":"","lt_cache_level":0,"metro_code":820,"page_ad_positions":"","page_view_count":0,"page_view_id":"2daf0911-6958-4839-7e19-1b83275532ea","position_selection_id":0,"postal_code":"97058","pv_event_count":0,"response_size_orig":4,"response_time_orig":288,"serverid":"34.219.211.72:15785","state":"OR","t_epoch":1669521655,"template_id":120,"time_on_site_visit":0,"url":"https://sendy.daily-dev-tips.com/api/subscribers/active-subscriber-count.php","user_id":0,"word_count":1,"worst_bad_word_level":0};var _ezExtraQueries = "&ez_orig=1";</script> <script data-ezscrex='false' data-pagespeed-no-defer data-cfasync='false'> function create_ezolpl(pvID, rv) { var d = new Date(); d.setTime(d.getTime() + (365*24*60*60*1000)); var expires = "expires="+d.toUTCString(); __ez.ck.setByCat("ezux_lpl_408517=" + new Date().getTime() + "|" + pvID + "|" + rv + "; " + expires, 3); } function attach_ezolpl(pvID, rv) { if (document.readyState === "complete") { create_ezolpl(pvID, rv); } if(window.attachEvent) { window.attachEvent("onload", create_ezolpl, pvID, rv); } else { if(window.onload) { var curronload = window.onload; var newonload = function(evt) { curronload(evt); create_ezolpl(pvID, rv); }; window.onload = newonload; } else { window.onload = create_ezolpl.bind(null, pvID, rv); } } } __ez.queue.addFunc("attach_ezolpl", "attach_ezolpl", ["2daf0911-6958-4839-7e19-1b83275532ea", "false"], false, ['/detroitchicago/boise.js'], true, false, false, false); </script></head><body>1894<script type='text/javascript' style='display:none;' async> __ez.queue.addFile('/detroitchicago/edmonton.webp', '/detroitchicago/edmonton.webp?a=a&cb=0&shcb=34', true, ['/detroitchicago/minneapolis.js'], true, false, false, false); __ez.queue.addFile('/porpoiseant/jellyfish.webp', '/porpoiseant/jellyfish.webp?a=a&cb=0&shcb=34', false, [], true, false, false, false); </script> <script>__ez.queue.addFile('/tardisrocinante/vitals.js', '/tardisrocinante/vitals.js?gcb=0&cb=3', false, ['/detroitchicago/minneapolis.js'], true, false, true, false);</script> <script type="text/javascript" data-cfasync="false"></script> <script>var _audins_dom="daily_dev_tips_com",_audins_did=408517;__ez.queue.addDelayFunc("audins.js","__ez.script.add", "//go.ezoic.net/detroitchicago/audins.js?cb=195-0");</script><noscript><div style="display:none;"><img src="//pixel.quantserve.com/pixel/p-31iz6hfFutd16.gif?labels=Domain.daily_dev_tips_com,DomainId.408517" border="0" height="1" width="1" alt="Quantcast"/></div></noscript> <script>__ez.queue.addFile('/beardeddragon/drake.js', '/beardeddragon/drake.js?gcb=0&cb=4', false, [], true, false, true, false);</script></body></html> devs and subscribe to my newsletter