Base.url_encode64

You're seeing just the function url_encode64, go back to Base module for more information.
Link to this function

url_encode64(data, opts \\ [])

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Specs

url_encode64(binary(), keyword()) :: binary()

Encodes a binary string into a base 64 encoded string with URL and filename safe alphabet.

Accepts padding: false option which will omit padding from the output string.

Examples

iex> Base.url_encode64(<<255, 127, 254, 252>>)
"_3_-_A=="

iex> Base.url_encode64(<<255, 127, 254, 252>>, padding: false)
"_3_-_A"