- What is Base64?
1. What is Base64?
Base64 uses 6 bits per character to represent binary data. Each chunk of data is represented by a character from the Base64 character set, divided into six-bit chunks and encoded in Base64. Whenever the last chunk of data is less than six bits, it is padded with zeros to make it a full six bits.
Base64 is commonly used for transmitting data over the internet and storing data in files. For example, it is used in email attachments, HTML images, and JSON Web Tokens (JWTs).
Here is an example of how to use atob() to decode Base64 data:
const base64String = 'SGVsbG8gV29ybGQh'; // Base64-encoded string constdecodedString = atob(base64String); // Decoded string console.log(decodedString); // Output: "Hello World!"
We begin with the Base64-encoded string SGVsbG8gV29ybGQh, which represents the string “Hello World!”. This string is passed to the atob() function, which returns the decoded binary data as a string. After that, we log the decoded string to the console.
Note that the atob() function only works with ASCII strings. It may be necessary to use a third-party library if the Base64-encoded data contains non-ASCII characters.
To use js-base64, you first need to install it using a package manager, such as npm:
npm install js-base64
Once installed, you can use the library to decode Base64 data as follows:
const base64 = require('js-base64'); const base64String = 'SGVsbG8gV29ybGQh'; // Base64-encoded string constdecodedString = base64.decode(base64String); // Decoded string console.log(decodedString); // Output: "Hello World!"
In this example, we first import the js-base64 library using require() function.
- Use Base64 for encoding binary data
- Use third-party libraries for advanced features
- Be aware of security risks
By itself, Base64 encoding does not provide any security. As a result, you should avoid encoding sensitive data using Base64, and you should always use encryption to protect your data.
- Test thoroughly
If you are working with Base64 data, it is important that you test your code thoroughly to ensure that it is functioning correctly. In order to ensure that your code is robust and reliable, you should test for edge cases, such as large data sets, non-ASCII characters, and unexpected input.