Скачать или смотреть How to Save Images Locally from a URL Using Node.js and fs

Learn how to download images from URLs to a local directory in your Node.js projects using the fs and https modules. Perfect for developing bots or applications that require image storage!
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This video is based on the question https://stackoverflow.com/q/74080796/ asked by the user 'Gleyveon' ( https://stackoverflow.com/u/18546880/ ) and on the answer https://stackoverflow.com/a/74080881/ provided by the user 'Ethan R' ( https://stackoverflow.com/u/17914167/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Save Images Locally from a URL Using Node.js and fs

If you're developing a Discord bot or any other Node.js application that needs to store images locally, you may find yourself needing to download images directly from a URL. This blog will guide you through the process of saving images to your local project directory using Node.js, specifically leveraging the fs and https core modules. Let’s dive right into it!

Understanding the Problem

Imagine you're working on a bot for YuGiOh, and you want it to download card images automatically from the internet. You have URLs pointing to these images, such as https://images.ygoprodeck.com/images/..., and you wish to save them locally to an img folder within your project. You might wonder, how can you accomplish this using JavaScript and Node.js? Don’t worry, it's quite straightforward!

Solution: Downloading Images Using Node.js

To tackle this problem, we will implement a simple function that downloads an image from a URL and saves it to our specified folder. Here’s how we can do it:

Step 1: Required Modules

First, we need to import the necessary core modules in Node.js:

fs – This module allows us to handle file system operations.

https – This module enables us to make HTTP requests to fetch the image.

Step 2: Create the Download Function

We will create a function that performs the download task. Here’s the code:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Using the Download Function

Now that we have our download function, we can use it to fetch and save our images. Below is an example of how to call this function:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Download Process

Creating a write stream: The fs.createWriteStream(dest) creates a writable stream which allows us to write our incoming data to a file located at the specified destination.

Fetching the image: The https.get() method retrieves the image from the URL.

Piping the response: The response.pipe(file) method is used to redirect the incoming response data into the write stream, effectively saving the image file.

Error handling: We handle any errors that occur while making the request. If an error occurs during the download, we delete any partially downloaded file.

Conclusion

By following these steps, you can smoothly download images from URLs and store them locally within your Node.js projects. This not only helps in developing your bot efficiently but also allows for better organization of assets. Next time you find a URL for an image you want to save, remember this simple utility we've created. Happy coding!