How to get total driving distance ? node javascript or any api?

I have an array of lat/lng e,g ["14.60592,103.12081", "38.21146,114.86461", "13.73028,100.65138", "34.08863,108.39783", "57.186,14.04"] how to calculate overall distance .A to B and B to C. i try in google-distance-matrix

via Muhammad Kashif