I have string a s1 = 'abcd' and s2 = 'this is demo abc'

is there library or way to do following fuzzy matching in javascript - I want index of fuzzy matched string , it's size and ratio

Ex.output - index - 13 fuzzy matched string size - 3 ratio - 80%

I searched lot of fuzzy matching libraries in javascript but they usually search in a list of strings and return closest element.

But I want to search string into larger string and get all the details like matched string index,size and matching percentage.