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base64 encoding and decoding is a common technique used to convert binary data into a text format that is safe for transmission over text-based protocols like http. in javascript, you can use the built-in `btoa()` and `atob()` functions to encode and decode strings to and from base64.

here's a step-by-step tutorial on how to encode and decode strings with base64 in javascript:

1. *encoding a string to base64:*
to encode a string to base64, you can use the `btoa()` function. this function takes a string as input and returns a base64-encoded version of that string.



2. *decoding a base64 string:*
to decode a base64 string back to its original form, you can use the `atob()` function. this function takes a base64-encoded string as input and returns the decoded original string.



3. *putting it all together:*
you can easily encode a string to base64 and then decode it back to the original string as shown below:



4. *handling non-ascii characters:*
keep in mind that `btoa()` and `atob()` functions work with ascii characters. if you need to encode/decode non-ascii characters (unicode), you can use the `textencoder` and `textdecoder` apis available in modern browsers.

here's an example to encode and decode a string containing non-ascii characters:



that's it! you now know how to encode and decode strings with base64 in javascript. feel free to experiment with different strings and encoding/decoding scenarios to further understand how base64 works.

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