Node.js

Find and Delete Object from JSON Array

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Demonstrates how to find an delete an object from a JSON array of objects. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // This example will delete the "Pasta" category object from Menu B.

    // {
    //   "menus": [
    //     {
    //       "name": "Menu A",
    //       "categories": [
    // 			{
    // 			"name": "Kebabs",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Burgers",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Pasta",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Appetizers",
    // 			"description": "blah blah blah"
    // 			}
    // 		]
    // 	},
    //     {
    //       "name": "Menu B",
    //       "categories": [
    // 			{
    // 			"name": "Kebabs",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Burgers",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Pasta",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Appetizers",
    // 			"description": "blah blah blah"
    // 			}
    // 		]
    // 	  }
    // 	]
    // }

    var json = new chilkat.JsonObject();
    success = json.LoadFile("qa_data/json/menus.json");
    if (success == false) {
        console.log(json.LastErrorText);
        return;
    }

    // Find Menu B.
    // menu: JsonObject
    var menu = json.FindRecord("menus","name","Menu B",true);
    // assume menu is found..

    // Get the categories array, and then find the index of the "Pasta" menu category.
    // catArr: JsonArray
    var catArr = menu.ArrayOf("categories");
    // Assume it is found..

    // Find the object where the name of the JSON member is "name", and the value is "Pasta"
    var index = catArr.FindObject("name","Pasta",true);
    if (index < 0) {
        console.log("Pasta not found.");
    }
    else {

        // Delete the "Pasta" category record from Menu B
        success = catArr.DeleteAt(index);
        // Assume OK..
    }

    // Examine the JSON to see if it worked as expected..
    json.EmitCompact = false;
    console.log(json.Emit());


}

chilkatExample();