Скачать или смотреть Sending Email with Attachments Using Nodemailer and Excel4Node in Firebase Cloud Functions

Learn how to send emails with attached `.xlsx` files using `Nodemailer` and `Excel4Node` in Firebase Cloud Functions seamlessly.
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This video is based on the question https://stackoverflow.com/q/57235699/ asked by the user 'Natthapol Maneechote' ( https://stackoverflow.com/u/11344228/ ) and on the answer https://stackoverflow.com/a/69870090/ provided by the user 'Tanakom Talawat' ( https://stackoverflow.com/u/5973998/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Send Emails with .xlsx Attachments Using Nodemailer in Firebase Cloud Functions

If you've ever wanted to send email attachments directly from your Firebase Cloud Functions, you're not alone. Many developers face the challenge of generating a .xlsx file and attaching it to an email. Fortunately, with the right libraries, specifically Nodemailer for email delivery and excel4node for generating Excel files, this task can be accomplished smoothly. In this guide, we'll break down how you can use these libraries together to send an email with an Excel file attachment without running into filesystem issues.

The Challenge

The main challenge arises when trying to generate an Excel file with excel4node, then sending this file as an attachment through Nodemailer. Firebase's serverless environment comes with its own limitations, particularly with the file system, which is read-only in many instances. This means that common approaches, like storing the file temporarily on disk, will lead to errors such as:

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The Solution

To overcome the filesystem limitations, you can generate the .xlsx file directly in memory and send it via email without writing it to the disk. Below is a step-by-step guide on how to achieve this.

Step 1: Set Up Your Environment

Make sure you have both Nodemailer and excel4node installed in your Firebase Cloud Functions environment. If you haven't installed them yet, you can do so using npm:

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Step 2: Create an Email Sending Function

You can create an asynchronous function that handles the creation of the Excel workbook and sends the email. Here’s a code snippet to guide you:

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Step 3: Call Your Function

Now that your function is set up, you simply need to call sendMail() with the appropriate data. Make sure to handle any asynchronous logic or errors that may arise.

Summary

To send an email with a .xlsx attachment directly from Firebase Cloud Functions using Nodemailer and Excel4Node, the key is to generate the Excel file in memory rather than from the filesystem. By following these steps, you can efficiently send emails without encountering filesystem errors.

With the right setup, you'll be able to enhance your applications and provide seamless email functionality. Give it a try, and you’ll be amazed at how simple it is to add this capability to your Firebase projects!