Not getting all the keys of nested object using Javascript

Question

I am trying to fetch all the keys of one nested object using Javascript but as per my code its not working as expected. I am explaining my code below.

let jsonObj = {
    "service":[
        {
            "name":"restservice",
            "device":"xr-1",
            "interface-port":"0/0/2/3",
            "interface-description":"uBot testing for NSO REST",
            "addr":"10.10.1.3/24",
            "mtu":1024
        }
    ],
    "person": {
    "male": {
      "name": "infinitbility"
    },
    "female": {
      "name": "aguidehub"
    }
  }
}

const getNestedKeys = (data, keys) => {
  if(!(data instanceof Array) && typeof data == 'object'){
    Object.keys(data).forEach(key => {
      keys.push(key);
      const value = data[key];
      if(typeof value === 'object' && !(value instanceof Array)){
         getNestedKeys(value, keys);
      }
   });
  }
  return keys
}
let result = getNestedKeys(jsonObj, []);

console.log('result', result);

Here I am not getting the keys present inside the service array. I need to search all the keys present inside one nested object using Javascript.

Please take note that let jsonObj means you do not have JSON, you have a normal JS object. — evolutionxbox
– evolutionxbox, Commented May 17, 2022 at 7:25
In both places you are checking that the property you are currently handling is not instanceof Array - but service is an array? — C3roe
– C3roe, Commented May 17, 2022 at 7:30
add an else if(Array.isArray(value)) after the second if and inside that value.forEach(val => getNestedKeys(val, keys)) . someting like this? — cmgchess
– cmgchess, Commented May 17, 2022 at 7:31
What should happen if there are multiple items in the array? — Som Shekhar Mukherjee
– Som Shekhar Mukherjee, Commented May 17, 2022 at 7:35
in case need to remove duplicates from the final result [...new Set(result)] — cmgchess
– cmgchess, Commented May 17, 2022 at 7:38

R4ncid · Accepted Answer · 2022-05-17 07:31:40Z

1

you can do this

const readAllKeys = obj => {
  if(typeof obj !== 'object'){
    return []
  }
  if(Array.isArray(obj)){
    return obj.flatMap(readAllKeys)
  }
  
  return [...Object.keys(obj), ...Object.values(obj).flatMap(readAllKeys)]
}


let jsonObj = {
    "service":[
        {
            "name":"restservice",
            "device":"xr-1",
            "interface-port":"0/0/2/3",
            "interface-description":"uBot testing for NSO REST",
            "addr":"10.10.1.3/24",
            "mtu":1024
        }
    ],
    "person": {
    "male": {
      "name": "infinitbility"
    },
    "female": {
      "name": "aguidehub"
    }
  }
}

console.log(readAllKeys(jsonObj))

answered May 17, 2022 at 7:31

R4ncid

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1 Comment

Som Shekhar Mukherjee Over a year ago

Note: If there are multiple entries in the array, the key is added multiple times.

dluk · Accepted Answer · 2022-05-17 07:38:21Z

You are asking for it to work with "service" key which is an array, but your code explicitly checks type and if it's array it just ignores it. Here is the code adjusted to work with array too.

let jsonObj = {
    "service":[
        {
            "name":"restservice",
            "device":"xr-1",
            "interface-port":"0/0/2/3",
            "interface-description":"uBot testing for NSO REST",
            "addr":"10.10.1.3/24",
            "mtu":1024
        }
    ],
    "person": {
    "male": {
      "name": "infinitbility"
    },
    "female": {
      "name": "aguidehub"
    }
  }
}

const getNestedKeys = (data, keys) => {
  if(data instanceof Array) {
      data.forEach(value => {
          getNestedKeys (value, keys);
      });
  }

  if(!(data instanceof Array) && typeof data == 'object'){
    Object.keys(data).forEach(key => {
      keys.push(key);
      const value = data[key];
      if(typeof value === 'object'){
         getNestedKeys(value, keys);
      }
   });
  }
  return keys
}
let result = getNestedKeys(jsonObj, []);

console.log('result', result);

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