Doc Diff Patch

Finding the complete diff between two JSONs and recreation of the original JSON from the current version of the JSON and previously calculated diff for version management.

Installation

npm install doc-diff-patch

Usage

Initializing

  var vm = require('doc-diff-patch')
  const previousJson = {
      a: "How are you?",
      b: [1,2,3,4]
  };
  const updatedJson = {
      a: "Where are you?",
      b: [1,2,3,4,5]
  };

Finding diff

  const diff = vm.structDiff(previousJson, updatedJson);
  console.log(JSON.stringify(diff))
  /*
    Output: 
    {
      "a": [
        {"action": "ins", "pos": 0, "val": "Where"},
        {"action": "del", "pos": 0, "val": "How"}
      ],
      "b": [
        {"action": "ins", "pos": 4, "val": [5]}
      ]
    }
   */

Finding diff with filter

  const filter = {b: 1};
  const diff = vm.structDiff(previousJson, updatedJson);
  console.log(JSON.stringify(diff))
  /*
    Output: 
    {
      "b": [
        {"action": "ins", "pos": 4, "val": [5]}
      ]
    }
   */

Finding original json from updated json and full diff

  console.log(JSON.stringify(vm.patchDiff(updatedJson, diff)))
  /*
    Output: 
    {
      "val": {
        "a": "How are you?",
        "b": [1,2,3,4]
      },
      "err": ""
    }
   */