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I have encountered a number of implementations of algorithms for converting a byte array to a hexadecimal string in many languages:

Why is this conversion used so often?
What are the advantages of storing byte arrays as hexadecimal strings?

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  • How would you store a byte array? Commented Sep 22, 2015 at 16:50
  • To examine its contents programatically, for example. Commented Sep 22, 2015 at 16:52

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For example:

  • To store in a file with a format that doesn't support binary, e.g. CSV.
  • To store in a database field that doesn't support binary.
  • To send in a protocol that doesn't support binary.
  • To embed in other content that doesn't support binary, e.g. XML and JSON.
  • To display to a user.
  • Many other reasons...
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