Fetch API

Connecting Salesforce Lightning Web Components (LWC) with external web services allows you to pull live third-party data directly into your user interface. In this step-by-step tutorial, we will build a dynamic weather component in LWC that fetches live weather forecasts based on user-entered locations using JavaScript's native fetch() API. In plain words: An LWC Weather Component takes a city or location name from an input box, sends an HTTP request to an external weather REST API, and presents live metrics like temperature and sky conditions right on the page.

In plain words: External API integration in Lightning Web Components (LWC) allows Salesforce components to send requests to third-party web services—such as toll calculation, mapping, or payment gateways. In Salesforce, you can invoke external endpoints either directly from JavaScript using the browser's fetch() API (with CSP Trusted Sites enabled) or securely through an Apex callout using Named Credentials . Connecting Salesforce applications with external web services is a core requirement in logistics, fleet management, and finance. For instance, querying a toll calculation service allows transportation teams to estimate route costs dynamically from an Account or Work Order page. Below, we break down how to configure network permissions and execute external API requests cleanly from an LWC component.

In plain words: When building modern web applications, you often need to talk to third-party services—like checking if a phone number is valid, looking up weather data, or processing payments via an external API. In Salesforce Lightning Web Components (LWC), because your code runs directly in the browser, you can use the standard JavaScript fetch() method to talk directly to external web services without needing to write backend Apex controller code! Traditionally in Salesforce, if you needed to make an HTTP request to an external server, you had to route the call through an Apex class using the Http and HttpRequest classes. While Apex callouts are still mandatory for secure server-to-server communications, Lightning Web Components run on modern browsers that natively support the standard JavaScript fetch() API. In this guide, we will walk through how to build a phone number verification component that queries an external REST API directly from your LWC contro...