Struggling to Deserialize this JSON in Apex [duplicate]

Question

Here is my initial apex that currently functions and will return json.

public class samCall {
@AuraEnabled

public static String samQuery(string accountDuns) {

            HttpRequest req = new HttpRequest();
            req.setEndpoint( 'callout:samAPI/entity-information/v2/entities?ueiDUNS=' + accountDuns);
            req.setHeader( 'X-Api-Key', '{!$Credential.Password}' );
            req.setMethod('GET');
            Http http = new Http();
            HTTPResponse res = http.send(req);

            return res.getBody();
        }
}

Here is Js -

import { LightningElement,wire,track,api } from 'lwc';

import getDuns from '@salesforce/apex/samCall.samQuery';

export default class searchSam extends LightningElement {

@api dunsNumber;
@track samRecord;
@track error;
@track data;

    handleClick(event){

        let inputDuns = this.template.querySelector('lightning-input').value;

        this.dunsNumber = inputDuns;

    }

    @wire(getDuns,{ accountDuns: '$dunsNumber'})

    samData({ error, data }) {

        if (data) {

            //console.log('RecordId is'+recordId);
            this.samRecord = data;
            console.log(samRecord);

            this.error = undefined;

        } else if (error) {

            //console.log('Error block');
            this.error = error;

            this.samRecord = undefined;

        }

    }

 }

---->> Final Apex

public class samCall {

@AuraEnabled(cacheable=true)
public static string samQuery(string accountDuns) {

    HttpRequest req = new HttpRequest();
    req.setEndpoint( 'callout:samAPI/entity-information/v2/entities?ueiDUNS=' + accountDuns);
    req.setHeader( 'X-Api-Key', '{!$Credential.Password}' );
    req.setMethod('GET');
    Http http = new Http();
    HTTPResponse res = http.send(req);

    entityApi parsedResponse =  (entityApi) JSON.deserialize(res.getBody(), entityApi.class);

    Object entReg = parsedResponse.entityData[0].entityRegistration;

    String pretty = JSON.serialize(entReg);

    System.debug('Is this pretty? >>>' + ' ' + pretty);

    return pretty;

}


public class entityApi {

    public Integer totalRecords;
    public List<EntityData> entityData;
    public List<NaicsList> naicsList;
}

    public class FinancialInformation {
        public String creditCardUsage;
        public String debtSubjectToOffset;
    }

    public class NaicsList {
        public String naicsCode;
        public String naicsDescription;
        public String sbaSmallBusiness;
    }

    public class EntityData {
        public EntityRegistration entityRegistration;
        public CoreData coreData;
        public Assertions assertions;
        public PointsOfContact pointsOfContact;
    }

    public class PhysicalAddress {
        public String addressLine1;
        public String city;
        public String stateOrProvinceCode;
        public String zipCode;
        public String zipCodePlus4;
        public String countryCode;
    }

    public class Assertions {
        public GoodsAndServices goodsAndServices;
        public DisasterReliefData disasterReliefData;
        public EdiInformation ediInformation;
    }

    public class GovernmentBusinessAlternatePOC {
        public String firstName;
        public String middleInitial;
        public String lastName;
        public String title;
        public String addressLine1;
        public String addressLine2;
        public String city;
        public String stateOrProvinceCode;
        public String zipCode;
        public String zipCodePlus4;
        public String countryCode;
    }

    public class EdiInformation {
        public String ediInformationFlag;
    }

    public class DisasterReliefData {
        public String disasterRegistryFlag;
        public String bondingFlag;
        public List<GeographicalAreaServed> geographicalAreaServed;
    }

    public class CoreData {
        public EntityInformation entityInformation;
        public PhysicalAddress physicalAddress;
        public PhysicalAddress mailingAddress;
        public String congressionalDistrict;
        public GeneralInformation generalInformation;
        public FinancialInformation financialInformation;
    }

    public class PointsOfContact {
        public GovernmentBusinessPOC governmentBusinessPOC;
        public GovernmentBusinessPOC electronicBusinessPOC;
        public GovernmentBusinessAlternatePOC governmentBusinessAlternatePOC;
        public GovernmentBusinessAlternatePOC electronicBusinessAlternatePOC;
        public GovernmentBusinessAlternatePOC pastPerformancePOC;
        public GovernmentBusinessAlternatePOC pastPerformanceAlternatePOC;
    }

    public class GeneralInformation {
        public String entityStructureCode;
        public String entityStructureDesc;
        public String entityTypeCode;
        public String entityTypeDesc;
        public String profitStructureCode;
        public String profitStructureDesc;
        public String organizationStructureCode;
        public String stateOfIncorporationCode;
        public String stateOfIncorporationDesc;
        public String countryOfIncorporationCode;
        public String countryOfIncorporationDesc;
    }

    public class GoodsAndServices {
        public String primaryNaics;
        public List<NaicsList> naicsList;
        public List<PscList> pscList;
    }

    public class GovernmentBusinessPOC {
        public String firstName;
        public String middleInitial;
        public String lastName;
        public String title;
        public String addressLine1;
        public String addressLine2;
        public String city;
        public String stateOrProvinceCode;
        public String zipCode;
        public String zipCodePlus4;
        public String countryCode;
    }

    public class EntityInformation {
        public String entityURL;
        public String entityDivisionName;
        public String entityDivisionNumber;
        public String entityStartDate;
        public String fiscalYearEndCloseDate;
        public String submissionDate;
    }

    public class PscList {
        public String pscCode;
        public String pscDescription;
    }

    public class Links {
        public String selfLink;
    }

    public class GeographicalAreaServed {
        public String geographicalAreaServedStateCode;
        public String geographicalAreaServedStateName;
        public String geographicalAreaServedCountyCode;
        public String geographicalAreaServedCountyName;
        public String geographicalAreaServedmetropolitanStatisticalAreaCode;
        public String geographicalAreaServedmetropolitanStatisticalAreaName;
    }

    public class EntityRegistration {
        public String samRegistered;
        public String ueiSAM;
        public String ueiDUNS;
        public String entityEFTIndicator;
        public String cageCode;
        public String dodaac;
        public String legalBusinessName;
        public String dbaName;
        public String purposeOfRegistrationCode;
        public String purposeOfRegistrationDesc;
        public String registrationStatus;
        public String registrationDate;
        public String lastUpdateDate;
        public String registrationExpirationDate;
        public String activationDate;
        public String ueiStatus;
        public String ueiExpirationDate;
        public String ueiCreationDate;
        public String noPublicDisplayFlag;
        public String exclusionStatusFlag;
        public String exclusionURL;
        public String dnbOpenData;
    }
}

Final JS ----

import { LightningElement,wire,track,api } from 'lwc';

import getDuns from '@salesforce/apex/samCall.samQuery';

export default class searchSam extends LightningElement {

@api dunsNumber;
@track samRecord;
@track error;
@track data;

    handleClick(event){

        let inputDuns = this.template.querySelector('lightning-input').value;

        this.dunsNumber = inputDuns;

    }

    @wire(getDuns,{ accountDuns: '$dunsNumber'})
    
    samData({ error, data }) {

        if (data) {

            //console.log('RecordId is'+recordId);
            this.samRecord = JSON.parse(data);

            this.error = undefined;

        } else if (error) {

            //console.log('Error block');
            this.error = error;

            this.samRecord = undefined;

        }

    }

 }

Final Html ----

<template>
<lightning-card title="Check SAM.GOV" icon-name="custom:custom63">
        <lightning-input type="text" label="Enter DUNS" value={dunsNumber}> </lightning-input>
            <lightning-button label="Check" onclick={handleClick} class="slds-m-left_x-small"></lightning-button>
            
            <p>Displaying SAM Information</p>
            DUNS Input: {dunsNumber}


            <template if:true={samRecord}>
                <p>Legal Business Name: {samRecord.legalBusinessName} </p>
                <p>Cage Code: {samRecord.CageCode} </p>
                <p>SAM UEI: {samRecord.ueiSAM} </p>
                <p>SAM Expiration Date {samRecord.registrationExpirationDate} </p>
                <p>Purpose of Registration: {samRecord.purposeOfRegistrationDesc} </p>
                <p>Registration Status: {samRecord.registrationStatus} </p>
            </template>
            <template if:true={error}>
                <p>1. Whoops! {error} </p>
            </template>

        </lightning-card>
</template>

Answer 1

You can simply add JSON.deserializeUntyped as Phil pointed out, if you don't need any additional processing in Apex and just want to pass info to LWC.

public class samCall {

@AuraEnabled
public static Map<String, Object> samQuery(string accountDuns) {

            HttpRequest req = new HttpRequest();
            req.setEndpoint( 'callout:samAPI/entity-information/v2/entities?ueiDUNS=' + accountDuns);
            req.setHeader( 'X-Api-Key', '{!$Credential.Password}' );
            req.setMethod('GET');
            Http http = new Http();
            HTTPResponse res = http.send(req);

            return (Map<String, Object>) JSON.deserializeUntyped(res.getBody());
        }
}

JSON2Apex is useful for easier work in Apex with responses from the server, in order to do so you can write your code like this.

public class samCall {

@AuraEnabled
public static Object samQuery(string accountDuns) {

            HttpRequest req = new HttpRequest();
            req.setEndpoint( 'callout:samAPI/entity-information/v2/entities?ueiDUNS=' + accountDuns);
            req.setHeader( 'X-Api-Key', '{!$Credential.Password}' );
            req.setMethod('GET');
            Http http = new Http();
            HTTPResponse res = http.send(req);

            // I'd recommend renaming JSON2Apex to something more meaningful for your context
            JSON2Apex parsedResponse =  (JSON2Apex) JSON.deserialize(res.getBody(), JSON2Apex.class);

             // do some processing with your response
             Object processedResult = '';
             return processedResult;

        }
        // Your JSON2Apex wrapper classes
}

Answer 2

Given your original code, you may as well just do the parsing client-side:

return res.getBody();

And:

samData({ error, data }) {
    if (data) {
        this.samRecord = JSON.parse(data);