download how to generate a password between 5 and 20 characters long

assumes that crypto.getRandomValues and Array.fill() are both available.

it uses only native Javascript- no installation or other libs required.

it's more concise than other answers (for general solution, 3 lines max can be one-liner) (OK well, sort of depending on how much you squint your eyes looking at a 'line').

it's more secure than accepted/highest-voted answer, and also more versatile, because first, it supports any case-sensitive character (including any of the ~150k (at the time of this writing) unicode chars, rather than just one of 36 case-insensitive alphanumeric ones), and second, it uses a secure random generator that is applied uniformly.Anyway, fwiw this update addresses both, which I don't believe any other answer does. Many other answers berate the use of Math.random() and then go on to use a better random number generator that is non-uniformly applied, with an end result that (just like using Math.random!) is not cryptographically secure. Many answers (including the original of this one) don't actually answer the letter- and number-count requirements of the OP.īelow are two solutions: general (no min letters/numbers), and with rules as specified in the OP. map((x) => wishlist)īookmarklet javascript:prompt('Random Uint32Array(o))).map(o=>n).join(''))())Īom(crypto.randomFillSync(new Uint32Array(length)))Ĭhars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-' var generatePassword = (Īom(crypto.getRandomValues(new Uint32Array(length))) No while (true), no if/else, no declaration.īase on mwag's answer, but this one uses crypto.getRandomValues, a stronger random than Math.random. For someone who is looking for a simplest script.

Download how to generate a password between 5 and 20 characters long