Decoding Base64 Strings with Node.jsĭecoding a Base64 string is quite similar to encoding it. In the output we can see the Base64 counterpart for the string that we converted to Base64. "" converted to Base64 is "c3RhY2thYnVzZS5jb20=" Run the above code, you shall see the following output. The toString method with "base64" as parameter will return data in the form of Base64 string. We then call the toString method on the buffer object that we just created and pass it "base64" as a parameter. In the above script we create a new buffer object and pass it our string that we want to convert to Base64. Let base64data = buff.toString( 'base64') Ĭonsole.log( '"' + data + '" converted to Base64 is "' + base64data + '"') Save the following code in a file encode-text.js. Here we will encode a text string to Base64 using the Buffer object. As you write code that deals with and manipulates data, you'll likely be using the Buffer object at some point. These include to/from UTF-8, UCS2, Base64 or even Hex encodings. Internally Buffer is an immutable array of integers that is also capable of performing many different encodings/decodings. In Node.js, Buffer is a global object which means that you do not need to use a require statement in order to use the Buffer object in your applications. The easiest way to encode Base64 strings in Node.js is via the Buffer object. This is where Base64 encoding comes extremely handy in converting binary data to the correct formats. Therefore, if you want to send images or any other binary file to an email server you first need to encode it in text-based format, preferably ASCII. On the other hand, the ASCII character set is widely known and very simple to handle for most systems.įor instance email servers expect textual data, so ASCII is typically used. Sending information in binary format can sometimes be risky since not all applications or network systems can handle raw binary. You can use any online text to Base64 converter to verify this result. Using this encoding table we can see that the string "Go win" is encoded as "R28gd2lu" using Base64. Here you can see that decimal 17 corresponds to "R", and decimal 54 corresponds to "2", and so on. These decimal values have been given below: Binary Decimal Now for each chunk above, we have to find its decimal value. You won't always be able to divide up the data into full sets of 6 bits, in which case you'll have to deal with padding. Note that some implementations of Base64 use different special characters than "+" and "/".Ĭoming back to the example, let us break our 8 bit data into chunks of 6 bits. This is because Base64 format only has 64 characters: 26 uppercase alphabet letters, 26 lowercase alphabet letters, 10 numeric characters, and the "+" and "/" symbols for the new line.īase64 doesn't use all the ASCII special characters, but only these few. However as we said earlier, Base64 converts the data in 8 bit binary form to chunks of 6 bits. You can see here that each character is represented by 8 bits. The first step is to convert this string into binary. Suppose we have a string "Go win" and we want to convert it into a Base64 string.
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