How to check nested JSON property and value exist in JavaScript?

Question

I am getting below JSON as API response. Response contains multiple session node, each session node contains multiple event node. I would like to identify the first "SEARCH" event ("type") in any of the session ascending. If the "SEARCH" event is found, then, from the particular event, I need to get the "Interest" node value.

var guestJson = await response.json(); 
           for(var property in guestJson)
           {                    
                if(property === "sessions")
                {                         
                     var sessionObj = JSON.parse(JSON.stringify(guestJson[property]))
                     for(var i=0; i< sessionObj.length; i++)
                     {   
                          var eachSessionObj = JSON.parse(JSON.stringify(sessionObj[i]))  
                          
                          for(var sessionProperty in eachSessionObj)                
                          {                                   
                               if(sessionProperty === "events")
                               {
                                    console.log("Events Found")
                                    //console.log(sessionProperty)
                               }
                          }                              
                     }
                }                  
           }

I am able to do with for loop like below. But i think it's not the effective way of doing that

Below is the JSON structure

{
     "firstName":"fn",
     "lastName":"ln",
     "gender":"male",
     "sessions":[
  {
     "currency":"USD",
     "events":[
        {
           "type":"SEARCH",
           "status":"PROCESSED",
           "arbitraryData":{
              "interest":"Health"
           }
        },
        {
           "type":"CHECK",
           "status":"PROCESSED",
           "arbitraryData":{
              "interest":"Dental"
           }
        }
     ]
  },
  {
     "currency":"USD",
     "events":[
        {
           "type":"SEARCH",
           "status":"PROCESSED",
           "arbitraryData":{
              "interest":"Health"
           }
        },
        {
           "type":"CHECK",
           "status":"PROCESSED",
           "arbitraryData":{
              "interest":"Dental"
           }
        }
     ]
  }

] }

I'd start with accessing guestJSON.sessions directly, rather than looping to find it. — mykaf
– mykaf, Commented Sep 6, 2022 at 19:23
if ('sessions' in guestJson) should do it. See in operator — Wyck
– Wyck, Commented Sep 6, 2022 at 19:25
I may get sessions or not. each session may have events or not. I need to get the "Interest" element value, if there is any event/session and if the event type is "SEARCH" — Jey
– Jey, Commented Sep 6, 2022 at 19:26

Fernando Bravo Diaz · Accepted Answer · 2022-09-06 19:40:10Z

1

You could try a function like this:

function extractInterest(guestJson) {
    // Get all sessions or else get an empty array
    const sessions = guestJson.sessions || [];

    // Filter all sessions with events
    const interest = sessions.filter(session => session.events)
        .flatMap(session => session.events) // Maps all the events to a single list
        .filter(event => event.type === "SEARCH") // Filter only the events with type "SEARCH"
        .map(event => event.arbitraryData.interest); // Extract the interest from each event

    return interest; // return the list of interests
}

When applied to your example JSON, this returns an array of interests like this:

[ 'Health', 'Health' ]

answered Sep 6, 2022 at 19:40

Fernando Bravo Diaz

5791 gold badge4 silver badges11 bronze badges

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

Collectives™ on Stack Overflow

How to check nested JSON property and value exist in JavaScript?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related