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For that we have the
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
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.