damerau-levenshtein-js
NPM package that calculates synchronously or asynchronously the Damerau-Levenshtein distance between strings
levenshtein-damerau
A quick and easy Damerau Levenshtein implementation (not a Levenshtein only operation which doesn't do look aheads or transpositions).
levenshtein-lte1
A very fast JavaScript implementation of Levenshtein distance for the k <= 1 case.