Adding Mailchimp Subscribe Newsletter in Next.js React Application.

In this blog we will learn about how to add a mailchimp newsletter subscription in a Nextjs react application.

Get the Mailchimp URL

Create an account on Mailchimp if you don’t already have one.
Create an audience campaign.

Navigate to Campaigns > Signup Forms > Signup forms tab and click on Embed forms and then select.

Copy the the form action value

// Example.
<form action="https://xyz.us19.list-manage.com/subscribe/post?u=96386247a54fss21f7bb3a1c&amp;id=072ss2cbd"...

Create Environment variable in Next.js app

Add Env variable in next.js application .env file for Mailchimp URL and paste the URL taken from form action above.

NEXT_PUBLIC_MAILCHIMP_URL=https://xyz.us19.list-manage.com/subscribe/post?u=96386247a54fss21f7bb3a1c&id=072ss2cbd

Install the React Mailchimp Subscribe Package

npm i react-mailchimp-subscribe html-entities

Create a React Component in next.js called NewsletterForm
Notice we have added NewsletterForm component which we will add shortly.

import MailchimpSubscribe from 'react-mailchimp-subscribe';
import NewsletterForm from './NewsletterForm';

const NewsletterSubscribe = () => {

  const MAILCHIMP_URL = process.env.NEXT_PUBLIC_MAILCHIMP_URL;

  return (
    <MailchimpSubscribe
      url={ MAILCHIMP_URL }
      render={ ( props ) => {
        const { subscribe, status, message } = props || {};
        return (
          <NewsletterForm
            status={ status }
            message={ message }
            onValidated={ formData => subscribe( formData ) }
          />
        );
      } }
    />
  );
};

export default NewsletterSubscribe;

Create another component called NewsletterForm

import { useState } from 'react';
import { decode } from 'html-entities';

const NewsletterForm = ( { status, message, onValidated }) => {

  const [ error, setError ] = useState(null);
  const [ email, setEmail ] = useState(null);

  /**
   * Handle form submit.
   *
   * @return {{value}|*|boolean|null}
   */
  const handleFormSubmit = () => {

    setError(null);

    if ( ! email ) {
      setError( 'Please enter a valid email address' );
      return null;
    }

    const isFormValidated = onValidated({ EMAIL: email });

    // On success return true
    return email && email.indexOf("@") > -1 && isFormValidated;
  }

  /**
   * Handle Input Key Event.
   *
   * @param event
   */
  const handleInputKeyEvent = ( event ) => {
    setError(null);
    // Number 13 is the "Enter" key on the keyboard
    if (event.keyCode === 13) {
      // Cancel the default action, if needed
      event.preventDefault();
      // Trigger the button element with a click
      handleFormSubmit();
    }
  }

  /**
   * Extract message from string.
   *
   * @param {String} message
   * @return {null|*}
   */
  const getMessage = (message) => {
    if ( !message ) {
     return null;
    }
    const result = message?.split('-') ?? null;
    if ( "0" !== result?.[0]?.trim() ) {
     return decode(message);
    }
    const formattedMessage = result?.[1]?.trim() ?? null;
    return formattedMessage ? decode( formattedMessage ) : null;
  }

  return (
    <>
      <div className="d-flex newsletter-input-fields">
        <div className="mc-field-group">
          <input
            onChange={(event) => setEmail(event?.target?.value ?? '')}
            type="email"
            placeholder="Your email"
            className="mr-2"
            onKeyUp={(event) => handleInputKeyEvent(event)}
          />
        </div>
        <div className="button-wrap wp-block-button">
          <button className="wp-block-button__link" onClick={handleFormSubmit}>
            Submit
          </button>
        </div>
      </div>
      <div className="newsletter-form-info">
        {status === "sending" && <div>Sending...</div>}
        {status === "error" || error ? (
          <div
            className="newsletter-form-error"
            dangerouslySetInnerHTML={{ __html: error || getMessage( message ) }}
          />
        ) : null }
        {status === "success" && status !== "error" && !error && (
          <div dangerouslySetInnerHTML={{ __html: decode(message) }} />
        )}
      </div>
    </>
  );
}

export default NewsletterForm

This will create a Newsletter Form in your React Application go ahead and try it out

That’s all folks!