Add express samples

Author: linusjf

express/apppathparams.js

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+#!/usr/bin/env node
+const express = require("express");
+const app = express();
+
+app.get("/show/:name/:age/", (req, res) => {
+  res.set({ "Content-Type": "text/plain; charset=utf-8" });
+  let name = req.params.name;
+  let age = req.params.age;
+  let msg = `${name} is ${age} years old`;
+  res.send(msg);
+});
+
+app.listen(3000, () => console.log("Application started on port 3000"));

express/apppatternmatch.js

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+#!/usr/bin/env node
+const express = require("express");
+const app = express();
+
+app.get("/city/:id([0-9]{1,5})", (req, res) => {
+  res.set({ "Content-Type": "text/plain; charset=utf-8" });
+  res.send(`id: ${req.params.id}`);
+});
+
+app.listen(3000, () => {
+  console.log("Application started on port 3000");
+});

express/appquery.js

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+#!/usr/bin/env node
+const express = require("express");
+
+const app = express();
+
+app.get("/greet", (req, res) => {
+  res.set({ "Content-Type": "text/plain; charset=utf-8" });
+  let name = req.query.name;
+  let msg = `Hello, ${name}`;
+  res.send(msg);
+});
+
+app.listen(3000, () => console.log("Application started on port 3000"));

express/appreqip.js

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+#!/usr/bin/env node
+const express = require("express");
+const app = express();
+
+app.get("/", (req, res) => {
+  res.set({ "Content-Type": "text/plain; charset=utf-8" });
+  res.send(`The request IP is: ${req.ip}`);
+});
+
+app.listen(3000, () => {
+  console.log("Application started on port 3000");
+});

express/appsimple.js

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+#!/usr/bin/env node
+const express = require("express");
+const app = express();
+app.get("/", (req, res) => res.send("Hello, there!"));
+app.listen(3000, () => console.log("Application started on port 3000"));