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Mastering Base64 Encoding and Decoding in JavaScript

JavaScript and many other programming languages use base64 encoding to convert data from one format to another. It’s a way of taking data that is not plain text and encoding it into text-based format for easier transmission and storage.

We will take a closer look at two essential functions for encoding and decoding base64 strings: Convert.ToBase64String() and Convert.FromBase64String().

1) Encoding a String to a Base64 String:

When we want to convert a non-text format to a text-based format, such as sending images or binary data over the internet, we use base64 encoding.

In this process, we first convert the data into an array of bytes. For example, lets say we have a string variable named “myString” that we want to encode in a base64 format:


string myString = “Hello World”;


To convert this to an array of bytes, we use the Encoding.UTF8.GetBytes() method.


byte[] myBytes = Encoding.UTF8.GetBytes(myString);


Now that we have converted the string into an array of bytes, the next step is to convert this array of bytes into a base64 string with the use of Convert.ToBase64String(). “`

string base64String = Convert.ToBase64String(myBytes);


The Convert.ToBase64String() method takes an array of bytes as parameter and returns a base64 encoded string.

This encoded string can then be transmitted over the internet or stored in a database. 2) Decoding a Base64 String to a String:

In the previous section, we discussed the steps for encoding a string into a base64 string.

Now, let’s take a look at decoding a base64 string to a normal string. To decode a base64 string, we start by using the Convert.FromBase64String() method.

This method takes a base64 encoded string as its parameter and returns an array of bytes. “`

byte[] decodedBytes = Convert.FromBase64String(base64String);


Now that we have the decoded bytes, we can convert it back to a normal string by using the Encoding.UTF8.GetString() method.


string decodedString = Encoding.UTF8.GetString(decodedBytes);


This method returns the original string that was encoded in the base64 format.


In conclusion, converting data from one format to another is a standard requirement in programming. Base64 encoding provides an easy way to convert non-textual data to text-based format for transmission and storage.

There are two essential functions for encoding and decoding base64 strings that are vital for any JavaScript developer to know. By using the Convert.ToBase64String() and Convert.FromBase64String() methods with Encoding.UTF8.GetBytes() and Encoding.UTF8.GetString() methods, we can easily encode and decode strings in base64 format.

Knowing how to use these methods can help you easily transfer binary data on the web and exchange data between different kinds of systems. In summary, base64 encoding is a commonly used method for converting non-textual data to text-based format, which makes transmission and storage more accessible.

Two essential methods, Convert.ToBase64String() and Convert.FromBase64String(), are critical for encoding and decoding base64 strings. These methods work together with Encoding.UTF8.GetBytes() and Encoding.UTF8.GetString() methods to make converting data formats more manageable.

By using these functions, developers can easily transfer binary data on the web and exchange data between different systems. Overall, understanding base64 encoding and its methods is a necessary skill for developers to have in their toolkit.

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