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I was recently working on an internal project and needed to convert some Scalable Vector Graphics SVG images to Base64 encoded strings. This particular application required all HTML content to be "inlined". Whatever your reason for showing up on my doorstep, this post describes how to convert data in a file to and from Base64 using Node. This is meant to be a simple utility that I can use as needed. This is not a production ready piece of code and it includes no error checking whatsoever.
My source file was XML-based. I did not test this program against binary data so you may need to alter the program to suite your own needs if you run into issues, although it should work. This program is very simple and as noted before, contains absolutely no error checking. If you are at all concerned about it then you should add any error checking code as needed.
The magic here is happening using an instance of the Node. Buffers have several methods for converting streams of data to various encodings. For more details, check out the documentation. It turns out going the other direction is not so bad. It does require a little more code.
The next program we write will read a file that contains Base64 encoded data and output the data as text ascii to the console. Follow the same steps as before to create a script and run the program. I called mine base64toSVG. I stored the Base64 encoded SVG in a file called svg. The program reads the data from the file provided svg.
If your original file did not contain text data then this probably won't work for you. If your source file was binary for example, you will need to alter this program to work for your own use-case. Stay up to date! Base64 Encode Text Data Step 1: Base64 Decode Text Data It turns out going the other direction is not so bad. Arial, Helvetica, Open Sans, sans-serif, monospace;font-size: