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I am trying to loop through an array of objects in an external json file using the map function. The loop succeeds but I am not sure how to access the object properties. See below.

I am using object.keys(obj).map() but cannot get access to the individual properties. Map keeps outputting the array index numbers.

This is my data I want to iterate through.

[
   {
     "id" : "12345",
     "customer" : "BMW",
   },
   {
     "id" : "45678",
     "customer" : "Ford",
   },
   {
     "id" : "78901",
     "customer" : "Google",
   } 
]

I have a state hook that the data will be saved to

const [accountData, setAccountData] = useState('');

The function below gets the data from the external json file and sets the state with it.


 axios.get('./data/account-info.json')
  .then((response) => {
     //set state
     setAccountData(response.data);
  })
  .catch((error) => {
     console.log(error);
  });

I iterate through the state object with a map function

Object.keys(accountData).map((id,customer) => {
  return(
    <div>
      <p>ID: {id}</p>
      <p>Name: {customer}</p>
    </div>
  )
})

The output keeps printing out the index numbers instead of the appropriate values

//outputted elements

<div>
  <p>ID: 0</p>
  <p>Name: 0</p>
</div>

<div>
  <p>ID: 1</p>
  <p>Name: 1</p>
</div>

<div>
  <p>ID: 2</p>
  <p>Name: 2</p>
</div>

Can you please tell me what I am doing wrong here? I know it has to be something simple.

I am trying to loop through an array of objects in an external json file using the map function. The loop succeeds but I am not sure how to access the object properties. See below.

I am using object.keys(obj).map() but cannot get access to the individual properties. Map keeps outputting the array index numbers.

This is my data I want to iterate through.

[
   {
     "id" : "12345",
     "customer" : "BMW",
   },
   {
     "id" : "45678",
     "customer" : "Ford",
   },
   {
     "id" : "78901",
     "customer" : "Google",
   } 
]

I have a state hook that the data will be saved to

const [accountData, setAccountData] = useState('');

The function below gets the data from the external json file and sets the state with it.


 axios.get('./data/account-info.json')
  .then((response) => {
     //set state
     setAccountData(response.data);
  })
  .catch((error) => {
     console.log(error);
  });

I iterate through the state object with a map function

Object.keys(accountData).map((id,customer) => {
  return(
    <div>
      <p>ID: {id}</p>
      <p>Name: {customer}</p>
    </div>
  )
})

The output keeps printing out the index numbers instead of the appropriate values

//outputted elements

<div>
  <p>ID: 0</p>
  <p>Name: 0</p>
</div>

<div>
  <p>ID: 1</p>
  <p>Name: 1</p>
</div>

<div>
  <p>ID: 2</p>
  <p>Name: 2</p>
</div>

Can you please tell me what I am doing wrong here? I know it has to be something simple.

  • javascript
  • json
  • reactjs
  • loops
  • object
Share Improve this question asked Aug 6, 2019 at 20:02 David SandersDavid Sanders 1311 gold badge3 silver badges16 bronze badges
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5 Answers 5

Reset to default 3

You can iterate accountData directly, as it's an array.
Each item will be an object, so you need to destructure as you see below.
(you don't need to but that's was the intention I perceived from your code)

And also you need to add a key to each element, to notify React how to keep track of elements.

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