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      How to Encode and Decode Strings with Base64 in JavaScript

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      Encoding and decoding a string in Base64 with JavaScript can be quite handy.

      For that we have the btoa() and atob() functions. These two base64 helper functions are a core part of the HTML spec and available in all modern browsers.

      • btoa() encodes to Base64
      • atob() decodes from Base64
      // Define the string
      var string = 'Hello World!';
      // Encode the String
      var encodedString = btoa(string);
      console.log(encodedString); // Outputs: "SGVsbG8gV29ybGQh"
      // Decode the String
      var decodedString = atob(encodedString);
      console.log(decodedString); // Outputs: "Hello World!"

      Copy and paste the examples above in your Chrome Console to see them working.

      Common use cases for Base64

      • Packaging things like form input and JSON strings into a character set that’s safer to use in HTTP requests
      • Representing binary data in a way that’s compatible with HTML/JavaScript/CSS. – You can embed an image inline in a CSS or JavaScript file using Base64, for example.

      What Base64 is not:

      • It’s in no way meant to be a secure encryption method,
      • It’s not a compression method, encoding a string to Base64 typically results in ~33% longer output.

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