![]() SmtpJS is a free library you can use for sending emails from JavaScript. These days, more and more bots run JS and do not rely on HTML rendered by the server alone. Some time ago, this could be mitigated by constructing a link in JS. mailto: doesn’t protect your email address from being harvested by spambots.You can’t control the layout of the data since the data is submitted in the form sent by the browser. ![]() The mailto: method is a rather easy solution to implement, but it has some specific drawbacks: Once the data has been submitted, the browser opens a default mail client. When you launch it in the browser, you’ll see the following: Check out how the following code example works: Technically, the mailto: method does not send email directly from the browser, but it can do the job. Since you can’t send an email directly with JS, you can tell the browser to open a default mail client to do so. Below, you will find a few options on how to make your app send emails from the client-side. This is a strong argument if your web app uses email sending for contact forms only. Besides, you don’t have to mess around with coding a server. So, why would anyone be willing to go another way and send emails right from the client-side using JavaScript? Such an approach is quite useful for building contact forms or other kinds of user interaction on web apps, which allows your app to send an email without refreshing the page the user is interacting with. If you’re curious about what happens with an email after that, read our blog post, SMTP relay. The client-side sends a request to the server-side, which creates an email and sends it to the SMTP server. You will need to set up a server using back-end technology. Traditionally, the server-side of a regular app is responsible for sending emails. Why you might want to send emails with JS This is the value we’re going to introduce below. You can use JS in conjunction with a server script that will send emails from the browser based on your requests. For this, you need a server-side language that talks to the SMTP server. You can’t send emails using JavaScript code alone due to the lack of support for server sockets. Let’s figure out how you can use JS to send emails from an app that has no back-end. In this article, we want to change the perspective from the server-side to the client-side. We even blogged about how to send emails with Node.js. When the name JavaScript is used in the context of sending emails, Node.js is the first thing that comes to mind. JavaScript is a programming language that you can use for both front-end and back-end development.
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