This is a native Node.js module written in C++ in order to solve Sudoku puzzles using Depth-first Search Algorithm.
npm i node-native-sudoku
var input = [
[0, 5, 7, 0, 6, 0, 2, 0, 0],
[8, 0, 2, 0, 0, 0, 0, 1, 6],
[0, 0, 0, 0, 0, 2, 0, 0, 0],
[0, 0, 0, 2, 0, 5, 0, 7, 4],
[7, 4, 0, 0, 0, 0, 0, 0, 0],
[0, 8, 1, 4, 9, 0, 0, 0, 0],
[6, 0, 3, 8, 5, 0, 0, 0, 7],
[1, 0, 0, 9, 0, 0, 0, 4, 3],
[0, 0, 0, 3, 0, 0, 0, 0, 2]
];
var output = sudoku.solve(input);
/*
Returns the following:
[
[4, 5, 7, 1, 6, 8, 2, 3, 9],
[8, 3, 2, 5, 4, 9, 7, 1, 6],
[9, 1, 6, 7, 3, 2, 4, 5, 8],
[3, 6, 9, 2, 1, 5, 8, 7, 4],
[7, 4, 5, 6, 8, 3, 9, 2, 1],
[2, 8, 1, 4, 9, 7, 3, 6, 5],
[6, 2, 3, 8, 5, 4, 1, 9, 7],
[1, 7, 8, 9, 2, 6, 5, 4, 3],
[5, 9, 4, 3, 7, 1, 6, 8, 2]
];
*/