Convert Data to Base64 in Node.js

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Today, we found there is a huge pitfall in node. Decipher has potential problem when processing Base64 encoding. Base64 encode64 has a very interesting feature: This format make the output look pretty and be friendly for human reading:. Ideally the data or string can be transcoded between these 4 encodings without data loss. Although encode64 function in node. It keeps the consistent behavior with ruby Base64 class, so we can use this decode64 function to decode the data from ruby.

Since base64 is one of base64 to binary nodejs standard encodings, and some of the node. So ideally, we can complete the base64 encoding and decoding during processing the data.

We base64 to binary nodejs combine reading file and base64 encoding the content into one operation by setting the encoding to readFileSync API. It looks like we can always use this trick to avoid manually base64 encoding and decoding when the API has encoding parameter!

But actually it is not true! There is a BIG pitfall here! In our real case, we base64 to binary nodejs crypto module to decrypt the the JSON document that encrypted and base64 encoded by Ruby:. The previous 2 implementations are very similar except the second one base64 decoded the data manually by using Buffer.

Ideally they should be equivalent in behavior. But in fact, they are NOT equivalent! So in the previous implementation, the data is polluted by the line break! It has inconsistent behavior comparing to Buffer class. But it is indeed base64 to binary nodejs pitfall that hides so deep. And usually is extremely hard to figure out. Since encrypted binary is hard to human to read, and debugging between 2 languages are also kind of hard!

Ruby In ruby, we use the default Base64 class to handle Base64 encoding. This format make the output look pretty and be friendly for human reading: Ruby Base64 Block 1. Please enable JavaScript to view the comments powered by Disqus.

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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.

I am also assuming that you already have Node. Create a new JavaScript program and call it whatever you want. I called mine svg2base Then, enter the following code into your source file. Run the program and provide the file name parameter to generate a Base64 encoded string of that file's contents. The program will read the contents of a file identified by argv[2] and output that content as a Base64 encoded string.

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: