Question 73186 in Reactjs Question posted in
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Get JSON value from string path – Reactjs

I need to extract a JSON value starting from my variable.
for example i have this json

const myJson = {
  "id": "someID",
  "organizations": [
    "0": {
      "id": "organizationId",
      "name": "organizationName"
    },
    "1": {
      ...
    },
    ...
  ] 
}

and this variable

var pathOfKey = ["organizations","0","id"];

how to get the value of ‘organizationId’ from my variable ‘pathOfKey’?

I don’t know in advance what the path to my key is but I have a variable with this information.
I need to get all the organization IDs of my array.

Tags:

3

Answers


  1. 0

    Basically you need to iterate pathOfKey array and traverse the object with key in the array simultaneously.

    function getValueFromObject(obj, path) {
  let currentNode = obj;

  for (key of path) {
    if (!currentNode.hasOwnProperty(key)) {
      return null;
    }
    currentNode = currentNode[key];
  }
  
  return currentNode;
}

getValueFromObject(myJson, pathOfKey)
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  2. 0 
    let obj = {
"a": {"b": "value"}
}

let tmpObj = obj;
let arr = ["a", "b"];

arr.forEach((objKey) => {
  if (tmpObj[objKey] !== undefined) {
    tmpObj = tmpObj[objKey];
  }
});

console.log(tmpObj);

    Something like this will do the job.
    Also, it can be done with a recursion function

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  3. 0

    The easiest solution is probably to use reduce().

    const value = pathOfKey.reduce((item, key) => item[key], myJson);
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