Many chess engines support UCI (Universal Chess Interface). This library is designed for use with Stockfish, but should work with other UCI engines.
{
  "BestMove": "c8d7",
  "Results": [
    {
      "Time": 136,
      "Depth": 10,
      "SelDepth": 16,
      "Nodes": 183853,
      "NodesPerSecond": 1351860,
      "MultiPV": 1,
      "Lowerbound": false,
      "Upperbound": false,
      "Score": 20,
      "Mate": false,
      "BestMoves": [
        "c8d7",
        "b5d6",
        "c7d6",
        "f3g5",
        "b8c6",
        "g5e4",
        "f5e4",
        "a1d1",
        "h7h6",
        "f2f4",
        "a8f8"
      ]
    },
    {
      "Time": 136,
      "Depth": 10,
      "SelDepth": 16,
      "Nodes": 183853,
      "NodesPerSecond": 1351860,
      "MultiPV": 2,
      "Lowerbound": false,
      "Upperbound": false,
      "Score": 2,
      "Mate": false,
      "BestMoves": [
        "a7a5",
        "b5d6",
        "c7d6",
        "b4b5",
        "b8d7",
        "f3d2",
        "e4d2",
        "e3d2",
        "b7b6",
        "a3a4"
      ]
    },
    {
      "Time": 136,
      "Depth": 10,
      "SelDepth": 16,
      "Nodes": 183853,
      "NodesPerSecond": 1351860,
      "MultiPV": 3,
      "Lowerbound": false,
      "Upperbound": false,
      "Score": -4,
      "Mate": false,
      "BestMoves": [
        "b8c6",
        "c2c4",
        "a7a6",
        "b5d6",
        "c7d6",
        "f3g5",
        "c8d7",
        "c4c5",
        "d6d5",
        "g5e4",
        "f5e4"
      ]
    },
    {
      "Time": 136,
      "Depth": 10,
      "SelDepth": 16,
      "Nodes": 183853,
      "NodesPerSecond": 1351860,
      "MultiPV": 4,
      "Lowerbound": false,
      "Upperbound": false,
      "Score": -18,
      "Mate": false,
      "BestMoves": [
        "e7f7",
        "h2h4",
        "a7a5",
        "b5d6",
        "c7d6",
        "b4a5",
        "b8d7",
        "f3g5",
        "e4g5",
        "h4g5",
        "a8a5",
        "e3d2"
      ]
    }
  ]
}