Question 214038 in Javascript Question posted in
A very good W3school tutorial can be found here.

Getting the path of a value in JSON using javascript

Let’s say I have a JSON file like so (char_table.json):

{
  "char_285_medic2": {
    "name": "Lancet-2",
    "description": "Restores the HP of allies and ignores the Deployment Limit, but has a long Redeployment Time",
    "canUseGeneralPotentialItem": false,
    "canUseActivityPotentialItem": false
   },
"char_291_aglina": {
    "name": "Angelina",
    "description": "Deals Arts damage and Slows the target for a short time",
    "canUseGeneralPotentialItem": true,
    "canUseActivityPotentialItem": false
   },
"char_2013_cerber": {
    "name": "Ceobe",
    "description": "Deals Arts damage",
    "canUseGeneralPotentialItem": true,
    "canUseActivityPotentialItem": false,
   },
   ...
}

I currently only have the "name" varible, and I want to find the path of the object containing that exact "name" (example: name = "Angelina" would return char_table.char_291_aglina | name = "Ceobe" would return char_table.char_2013_cerber). How can I exactly do that using javascript?

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2

Answers


  1. 0

    Try this recursive re-usable function

    1. Read the json file from a path and convert into js object
    const fs = require('fs')

const readJSONFromFile = filePath => {
  try {
    const jsonData = fs.readFileSync(filePath, 'utf-8');
    return JSON.parse(jsonData);
  } catch (error) {
    console.error(`Error reading JSON file: ${error.message}`);
    return null;
  }
}
    1. Find the node by property name and the value of that property using recursion function
    const findObjectNodeByPropertyAndValue = (obj, targetProperty, targetValue, currentPath = '') => {
  for (const key in obj) {
    if (typeof obj[key] === 'object') {
      const newPath = currentPath ? `${currentPath}.${key}` : key;
      if (obj[key][targetProperty] === targetValue) {
        return newPath;
      } else {
        const result = findObjectNodeByPropertyAndValue(obj[key], targetProperty, targetValue, newPath);
        if (result) {
          return result;
        }
      }
    }
  }
  return null;
}

    Usage:

    const filePath = '<YOUR-JSON-PATH>.json'
const charData = readJSONFromFile(filePath);
if(charData) {
  const node = `${filePath.split(".json")[0]}.${findObjectNodeByPropertyAndValue(charData, 'name', 'Angelina')}`;
  console.log(node)
}
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  2. 0 
    const char_table = require("./char_table.json");

function getKeyFromName(askedName) {
  for ([key, value] of Object.entries(char_table)) {
    if (value.name.includes(askedName)) return key;
  }
}
console.log("result", getKeyFromName("Ceobe")); // char_2013_cerber
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