Random alpha-numeric string in JavaScript?

The Solution to Random alpha-numeric string in JavaScript? is


I just came across this as a really nice and elegant solution:

Math.random().toString(36).slice(2)

Notes on this implementation:

  • This will produce a string anywhere between zero and 12 characters long, usually 11 characters, due to the fact that floating point stringification removes trailing zeros.
  • It won't generate capital letters, only lower-case and numbers.
  • Because the randomness comes from Math.random(), the output may be predictable and therefore not necessarily unique.
  • Even assuming an ideal implementation, the output has at most 52 bits of entropy, which means you can expect a duplicate after around 70M strings generated.

~ Answered on 2012-09-19 20:40:12


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