Last Sync: 2022-07-12 18:00:04

Programming_Languages/NodeJS/REST/Full_example.md

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+---
+tags:
+  - Programming_Languages
+  - backend
+  - node-js
+  - express
+  - REST
+  - apis
+---
+
+# Full example
+
+```js
+onst express = require("express");
+const app = express(); // convention to name Express as the app
+const port = process.env.PORT || 3000;
+const Joi = require("joi");
+const helmet = require("helmet");
+const morgan = require("morgan");
+
+// Middlewear
+app.use(express.json());
+app.use(helmet());
+
+const courses = [
+  {
+    id: 1,
+    name: "First course",
+  },
+  {
+    id: 2,
+    name: "Second course",
+  },
+  {
+    id: 3,
+    name: "Third course",
+  },
+];
+
+if (app.get("env") === "development") {
+  app.use(morgan("common"));
+}
+
+function validateCourse(course) {
+  const schema = Joi.object({
+    name: Joi.string().min(3).required(),
+  });
+
+  const { error } = schema.validate(course);
+  return error;
+}
+
+app.listen(port, () => console.log(`Listening on ${port}`));
+
+// Return all data from API
+app.get("/api/courses", (req, res) => {
+  res.send(courses);
+});
+
+// Return a specific value
+app.get("/api/courses/:id", (req, res) => {
+  const course = courses.find((c) => c.id === parseInt(req.params.id));
+  if (!course) res.status(404).send("A course with the given ID was not found");
+  res.send(course);
+});
+
+// Add a new course
+app.post("/api/courses", (req, res) => {
+  const schema = Joi.object({
+    name: Joi.string().min(3).required(),
+  });
+
+  const { error } = schema.validate(req.body);
+  if (error)
+    return error.details.map((joiErr) => res.status(400).send(joiErr.message));
+
+  const course = {
+    id: courses.length + 1,
+    name: req?.body.name,
+  };
+  courses.push(course);
+  res.send(course);
+});
+
+// Update a course
+app.put("/api/courses/:id", (req, res) => {
+  const course = courses.find((c) => c.id === parseInt(req.params.id));
+
+  if (!course)
+    return res.status(404).send("A course with the given ID was not found");
+  const { error } = validateCourse(req.body);
+
+  if (error)
+    return error.details.map((joiErr) => res.status(400).send(joiErr.message));
+
+  course.name = req.body.name;
+  res.send(course);
+});
+
+// Delete a course
+app.delete("/api/course/:id", (req, res) => {
+  const course = courses.find((c) => c.id === parseInt(req.params.id));
+  if (!course)
+    return res.status(404).send("A course with the given ID was not found");
+
+  courses.indexOf(course);
+  courses.splice(index, 1);
+
+  res.send(course);
+});
+
+
+```