Working with JSON data in Typescript without specified keys

Question

Working with JSON data in Typescript without specified keys

My goal is to extract the IssueId from the JSON data provided below:

[
 {
  "-MERcLq7nCj5c5gwpYih":
     {"CreateDate":"2020-08-11T08:27:13.300Z","Id":"-MERcLq7nCj5c5gwpYih","IssueId":"-ME3-tuhyqlaRdZCRapj","StatusId":"2", ...},
  "-MERdViSr8oCUGsCHouS":
     {"CreateDate":"2020-08-11T08:32:15.901Z","Id":"-MERdViSr8oCUGsCHouS","IssueId":"-ME3-tuhyqlaRdZCRapj","StatusId":"3", ...},
 ...
 },
 ...
]

I am looking to retrieve the most recent status ID and parse it into an object, but I'm facing a challenge as there are no keys for me to select each item individually. I have looked at other TypeScript JSON examples, but none seem to address this specific scenario. Is there a way for me to access the content without referencing the value -MERcLq7nCj5c5gwpYih?

json angular typescript

Answer 1

Answer №1

If you need to loop over an object, the for...in statement is the way to go. Check out this example:

export class AppComponent  {
  data = [
  {
    "-MERcLq7nCj5c5gwpYih": {
      "CreateDate": "2020-08-11T08:27:13.300Z",
      "Id": "-MERcLq7nCj5c5gwpYih",
      "IssueId": "-ME3-tuhyqlaRdZCRapj",
      "StatusId": "2"
    },
    "-MERdViSr8oCUGsCHouS":
    {
      "CreateDate": "2020-08-11T08:32:15.901Z",
      "Id": "-MERdViSr8oCUGsCHouS",
      "IssueId": "-ME3-tuhyqlaRdZCRapj",
      "StatusId": "3"
    }
  }
]

  ngOnInit(){
    const obj = this.data[0] // Assuming one object inside array
    for (const property in obj) {
        console.log(obj[property].CreateDate)
        console.log(obj[property].StatusId)
    }
  }
}

Learn more about the for..in statement here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Answer 2

If you need to loop over an object, the for...in statement is the way to go. Check out this example:

export class AppComponent  {
  data = [
  {
    "-MERcLq7nCj5c5gwpYih": {
      "CreateDate": "2020-08-11T08:27:13.300Z",
      "Id": "-MERcLq7nCj5c5gwpYih",
      "IssueId": "-ME3-tuhyqlaRdZCRapj",
      "StatusId": "2"
    },
    "-MERdViSr8oCUGsCHouS":
    {
      "CreateDate": "2020-08-11T08:32:15.901Z",
      "Id": "-MERdViSr8oCUGsCHouS",
      "IssueId": "-ME3-tuhyqlaRdZCRapj",
      "StatusId": "3"
    }
  }
]

  ngOnInit(){
    const obj = this.data[0] // Assuming one object inside array
    for (const property in obj) {
        console.log(obj[property].CreateDate)
        console.log(obj[property].StatusId)
    }
  }
}

Learn more about the for..in statement here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Answer 3

Answer №2

If you wish to extract the keys of an object and loop through them to access specific properties, you can utilize `Object.keys` as shown in the example below:

const data = [{
  "1": {
    "name": "John",
    "age": 30,
    "city": "New York"
  },
  "2": {
    "name": "Jane",
    "age": 25,
    "city": "Los Angeles"
  }
}]

const targetObj = data[0]
const objKeys = Object.keys(targetObj);
console.log(objKeys) 
//[
//  "1",
//  "2"
//]

objKeys.forEach(key => console.log(targetObj[key].name)) // accessing property by key
// John
// Jane

Answer 4

If you wish to extract the keys of an object and loop through them to access specific properties, you can utilize `Object.keys` as shown in the example below:

const data = [{
  "1": {
    "name": "John",
    "age": 30,
    "city": "New York"
  },
  "2": {
    "name": "Jane",
    "age": 25,
    "city": "Los Angeles"
  }
}]

const targetObj = data[0]
const objKeys = Object.keys(targetObj);
console.log(objKeys) 
//[
//  "1",
//  "2"
//]

objKeys.forEach(key => console.log(targetObj[key].name)) // accessing property by key
// John
// Jane

Answer 5

Answer №3

When dealing with nested objects, consider the following example:

var nestedObjects={
  "-M123ABC456":
     {"CreateDate":"2021-05-20T12:45:30.200Z","Id":"-M123ABC456","IssueId":"-XY789DEF","StatusId":"2", ...},
  "-N987XYZ321":
     {"CreateDate":"2021-05-20T12:50:40.500Z","Id":"-N987XYZ321","IssueId":"-XY789DEF","StatusId":"3", ...},
 ...
 }

To access nested objects dynamically, you can use the following method:

Object.keys(nestedObjects).forEach(key => {
   var dynamicObject=nestedObjects[key];

   // Access the desired properties:
   console.log(dynamicObject.CreateDate);
   console.log(dynamicObject.Id);
})

Answer 6

When dealing with nested objects, consider the following example:

var nestedObjects={
  "-M123ABC456":
     {"CreateDate":"2021-05-20T12:45:30.200Z","Id":"-M123ABC456","IssueId":"-XY789DEF","StatusId":"2", ...},
  "-N987XYZ321":
     {"CreateDate":"2021-05-20T12:50:40.500Z","Id":"-N987XYZ321","IssueId":"-XY789DEF","StatusId":"3", ...},
 ...
 }

To access nested objects dynamically, you can use the following method:

Object.keys(nestedObjects).forEach(key => {
   var dynamicObject=nestedObjects[key];

   // Access the desired properties:
   console.log(dynamicObject.CreateDate);
   console.log(dynamicObject.Id);
})

Working with JSON data in Typescript without specified keys

Answer №1

Answer №2

Answer №3

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