Handle json in node js

Question

I am writing a function in node js which accepts 2 parameter - "param1" is "jsonObj" & "param2" is "xpath"(as String) but when I am trying to extract the value using jsonObj.xpath I am getting result as undefined as it is looking for xpath as a key in the json object rather than cDel.dInfo.env. Can someone please let me know how to extract the value of cDel.dInfo.env from jsonObj.

Below is the sample code -

const json = '{ "cDel": { "dInfo": { "env": "ACCEPTANCE", "ref": 103163 } } }';
const obj = JSON.parse(json);

var getValue = (jsonObj,xpath) => {
       return jsonObj.xpath;
}

console.log(getValue(obj,"cDel.dInfo.env"));

Output is undefined. Expected Output is ACCEPTANCE.

Abhyudaya Sharma · Accepted Answer · 2021-01-05 09:01:14Z

1

You can use Lodash's get()

var object = { 'a': [{ 'b': { 'c': 3 } }] };
 
_.get(object, 'a[0].b.c');
// => 3
 
_.get(object, ['a', '0', 'b', 'c']);
// => 3
 
_.get(object, 'a.b.c', 'default');
// => 'default'

answered Jan 5, 2021 at 9:01

Abhyudaya Sharma

1,32715 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

kennysliding Over a year ago

I would also recommend lodash rather than reinventing the wheel if you aren't already using it.

Abhyudaya Sharma Over a year ago

If you only want get from Lodash, use npmjs.com/package/lodash.get

Amith Srinivasan Over a year ago

Thanks for the response. Lodash worked fine for me.

KooiInc · Accepted Answer · 2021-01-05 09:20:17Z

1

That's not how it works. Every property from xpath must be read separately. Something like:

const obj = JSON.parse('{ "cDel": { "dInfo": { "env": "ACCEPTANCE", "ref": 103163 } } }');
const getValue = (jsonObj, xpath) => {
  const path = xpath.split(".");
  let value = jsonObj;
  
  while (path.length) {
    value = value[path.shift()];
  }
  return value;
}

console.log(`obj.cDel.dInfo.env => ${getValue(obj, "cDel.dInfo.env")}`);

edited Jan 5, 2021 at 9:20

answered Jan 5, 2021 at 9:01

KooiInc

124k32 gold badges145 silver badges181 bronze badges

2 Comments

Amith Srinivasan Over a year ago

Thanks for the response. Above code will work fine for json with no array. Since I want write generic function I think lodash suites my requirement.

KooiInc Over a year ago

Your question did not mention an array within the json

Collectives™ on Stack Overflow

Handle json in node js

2 Answers 2

3 Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related