feat: add graphql explanation

Gildaciolopes · Gildaciolopes · commit 53720e6060fc · 2025-03-18T19:11:21.000-03:00
diff --git a/advanced/graphql.js b/advanced/graphql.js
@@ -0,0 +1,41 @@
+// &#128204; JavaScript Advanced - Introduction to GraphQL
+
+// Welcome to the GraphQL section of the JavaScript Advanced tutorial!
+// Here, you'll learn how to use GraphQL as an alternative to REST APIs.
+
+// Installing GraphQL and Express
+// Run the following command in your Node.js project:
+// npm install express graphql express-graphql
+
+const express = require("express");
+const { graphqlHTTP } = require("express-graphql");
+const { buildSchema } = require("graphql");
+
+//  Defining a GraphQL Schema
+const schema = buildSchema(`
+  type Query {
+    message: String
+  }
+`);
+
+// Root Resolver
+const root = {
+  message: () => "Hello, GraphQL!",
+};
+
+// Setting Up an Express Server with GraphQL
+const app = express();
+app.use(
+  "/graphql",
+  graphqlHTTP({
+    schema: schema,
+    rootValue: root,
+    graphiql: true, // Enables GraphiQL UI
+  })
+);
+
+app.listen(4000, () => {
+  console.log("GraphQL server running at http://localhost:4000/graphql");
+});
+
+// &#128161; GraphQL allows flexible querying, reducing over-fetching and under-fetching of data!
