What is the best method for retrieving an array stored within a Json object?

Upon receiving a JSON response, my goal is to extract all project names listed within.

After trying the usual method of iterating through arrays, I realized that in this case, "d" is not an array itself. How can I go about retrieving the desired result?

{
    "d": {
    "results": [
        {
            "ProjectId": "696fcc7c-f355-e511-93f0-00155d008500",
            "ProjectName": "Payroll",
            "EnterpriseProjectTypeDescription": null,
            "EnterpriseProjectTypeId": null,
            "EnterpriseProjectTypeIsDefault": null
        },
        {
            "ProjectId": "696fcc7c-f355-e511-93f0-00155d008505",
            "ProjectName": "Permanant",
            "EnterpriseProjectTypeDescription": null,
            "EnterpriseProjectTypeId": null,
            "EnterpriseProjectTypeIsDefault": null
        }
    ]
    }
}
javascriptjsonajaxrest

Answer №1

To achieve this, utilize the Array.prototype.map() method:

var names = myData.d.results.map(function(item){
    return item.ProjectName;
});

After running this code, you will obtain an array similar to:

["Payroll", "Permanant"]

(Assuming that myData represents the object mentioned in your query)

Answer №2

To retrieve the array from the response and iterate through it, you can utilize jsonObject.d.results along with forEach(). 

var res = {
  "d": {
    "results": [{
        "ProjectId": "696fcc7c-f355-e511-93f0-00155d008500",
        "ProjectName": "Payroll",
        "EnterpriseProjectTypeDescription": null,
        "EnterpriseProjectTypeId": null,
        "EnterpriseProjectTypeIsDefault": null
      }, {
        "ProjectId": "696fcc7c-f355-e511-93f0-00155d008505",
        "ProjectName": "Permanant",
        "EnterpriseProjectTypeDescription": null,
        "EnterpriseProjectTypeId": null,
        "EnterpriseProjectTypeIsDefault": null
      }
    ]
  }
};

res.d.results.forEach(function(v) {
  document.write(v.ProjectName + '<br>')
})

If you prefer to receive it as an array, you can make use of map()

var res = {
  "d": {
    "results": [{
      "ProjectId": "696fcc7c-f355-e511-93f0-00155d008500",
      "ProjectName": "Payroll",
      "EnterpriseProjectTypeDescription": null,
      "EnterpriseProjectTypeId": null,
      "EnterpriseProjectTypeIsDefault": null
    }, {
      "ProjectId": "696fcc7c-f355-e511-93f0-00155d008505",
      "ProjectName": "Permanant",
      "EnterpriseProjectTypeDescription": null,
      "EnterpriseProjectTypeId": null,
      "EnterpriseProjectTypeIsDefault": null
    }]
  }
};

var result = res.d.results.map(function(v) {
  return v.ProjectName;
})

document.write(JSON.stringify(result));

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