Here is the clear explanation of how to call a Fetch-like API in Apex (Salesforce) using HttpRequest, because Salesforce does NOT support fetch() directly. Instead, Apex uses the Http and HttpRequest classes.

✅ Fetch API Equivalent in Apex (Salesforce)

In JavaScript, you use:

fetch('https://example.com/api', {
  method: 'GET'
})

JavaScript

In Apex, the equivalent is:

⭐ GET Request (Fetch Equivalent) – Apex Code

public with sharing class FetchLikeCallout {
    @future(callout=true)
    public static void getCallout() {
        Http http = new Http();
        HttpRequest req = new HttpRequest();
        
        req.setEndpoint('https://example.com/api');
        req.setMethod('GET');
        
        // Optional: Add headers
        req.setHeader('Content-Type', 'application/json');

        HttpResponse res = http.send(req);
        System.debug('STATUS: ' + res.getStatus());
        System.debug('BODY: ' + res.getBody());
    }
}

JavaScript

⭐ POST Request (Fetch POST Equivalent)

JavaScript fetch:

fetch('https://example.com/api', {
  method: 'POST',
  body: JSON.stringify({name:"ChatGPT"})
})

JavaScript

Apex version:

public with sharing class ApexPostCallout {
    @future(callout=true)
    public static void postCallout() {
        Http http = new Http();
        HttpRequest req = new HttpRequest();

        req.setEndpoint('https://example.com/api');
        req.setMethod('POST');
        req.setHeader('Content-Type', 'application/json');

        // JSON Body
        Map<String, Object> body = new Map<String, Object>();
        body.put('name', 'ChatGPT');
        req.setBody(JSON.serialize(body));
        
        HttpResponse res = http.send(req);
        System.debug('STATUS: ' + res.getStatus());
        System.debug('BODY: ' + res.getBody());
    }
}

JavaScript

⭐ Fetch With Authorization Header (Bearer Token)

HttpRequest req = new HttpRequest();
req.setEndpoint('https://example.com/protected/api');
req.setMethod('GET');

req.setHeader('Authorization', 'Bearer YOUR_TOKEN_HERE');
req.setHeader('Content-Type', 'application/json');

Http http = new Http();
HttpResponse res = http.send(req);
System.debug(res.getBody());

JavaScript

⭐ If You Need Named Credentials (BEST PRACTICE)

HttpRequest req = new HttpRequest();
req.setEndpoint('callout:My_Named_Credential/api/data');
req.setMethod('GET');

Http http = new Http();
HttpResponse res = http.send(req);

System.debug(res.getBody());

JavaScript

This avoids storing tokens manually.

⭐ Handling Response JSON in Apex

String jsonBody = res.getBody();
Map<String, Object> data = (Map<String, Object>) JSON.deserializeUntyped(jsonBody);
System.debug('Value: ' + data.get('key'));

JavaScript

Fetch API in Apex Salesforce

✅ Fetch API Equivalent in Apex (Salesforce)

⭐ GET Request (Fetch Equivalent) – Apex Code

⭐ POST Request (Fetch POST Equivalent)

⭐ Fetch With Authorization Header (Bearer Token)

⭐ If You Need Named Credentials (BEST PRACTICE)

⭐ Handling Response JSON in Apex

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