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The btoa() method in JavaScript is used to encode a string as base-64. This method takes a single argument, which is the string that you want to encode, and returns the base-64 encoded string.

Here is an example of how the btoa() method works:

const string1 = 'Hello, world!';

const result = btoa(string1);

// the result will be: 'SGVsbG8sIHdvcmxkIQ=='

In the code example above, we first declare a string called string1 that contains the text Hello, world!. We then use the btoa() method to encode the string1 string as base-64. We pass the string1 string as an argument to the btoa() method to specify the string that we want to encode.

As a result of calling the btoa() method, the result variable will be set to 'SGVsbG8sIHdvcmxkIQ==', which is the base-64 encoded version of the string1 string. The btoa() method encodes the string and returns the base-64 encoded string.