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Base62 encoding converts numbers (positive integers) to ASCII strings and vice versa:

import { encode, decode } from "base62";

encode(9999); // "7bH"
decode("7bH"); // 9999

decode(239000); // "10aQ"
decode("10aQ"); // 239000

You might also use a custom character set, i.e. something other than the default ASCII characters:

import { encode, decode, indexCharset } from "base62/custom";

// NB: must be a string of exactly 62 unique characters
let charset = indexCharset("äöü…$#@%!…ß");

encode(…, charset);
decode(…, charset);

• ensure Node is installed
• npm install downloads dependencies
• npm test runs the test suite and checks code for stylistic consistency

This library is loosely based on Andrew Nesbitt's Base62.js.