Express

https://expressjs.com/es/
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Express es un marco web rápido, sin opinión y minimalista para Node.js que provee un conjunto...
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### Create a basic Express application

Source: https://expressjs.com/es

A minimal example showing how to initialize an Express app, define a route, and start the server on port 3000.

```javascript
const express = require('express');
const app = express()
const port = 3000


app.get('/', (req, res) => {
  res.send('Hello World!')
})


app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})
```

--------------------------------

### Install pg-promise with bun

Source: https://expressjs.com/es/guide/database-integration

Installs the pg-promise module using bun.

```bash
bun add pg-promise
```

--------------------------------

### Install serve-index via bun

Source: https://expressjs.com/es/resources/middleware/serve-index

Install the serve-index package using bun.

```bash
bun add serve-index
```

--------------------------------

### Install serve-index via yarn

Source: https://expressjs.com/es/resources/middleware/serve-index

Install the serve-index package using yarn.

```bash
yarn add serve-index
```

--------------------------------

### Install serve-index via pnpm

Source: https://expressjs.com/es/resources/middleware/serve-index

Install the serve-index package using pnpm.

```bash
pnpm add serve-index
```

--------------------------------

### Install mysql module

Source: https://expressjs.com/es/guide/database-integration

Installation commands for the mysql module.

```bash
npm install mysql
```

```bash
yarn add mysql
```

```bash
pnpm add mysql
```

```bash
bun add mysql
```

--------------------------------

### Install vhost via bun

Source: https://expressjs.com/es/resources/middleware/vhost

Install the vhost package using bun.

```bash
bun add vhost
```

--------------------------------

### Install oracledb with bun

Source: https://expressjs.com/es/guide/database-integration

Installs the oracledb module using bun.

```bash
bun add oracledb
```

--------------------------------

### Install serve-index via npm

Source: https://expressjs.com/es/resources/middleware/serve-index

Install the serve-index package using npm.

```bash
npm install serve-index
```

--------------------------------

### Install levelup for LevelDB

Source: https://expressjs.com/es/guide/database-integration

Installation commands for the level, levelup, and leveldown modules.

```bash
npm install level levelup leveldown
```

```bash
yarn add level levelup leveldown
```

```bash
pnpm add level levelup leveldown
```

```bash
bun add level levelup leveldown
```

--------------------------------

### Install pg-promise with npm

Source: https://expressjs.com/es/guide/database-integration

Installs the pg-promise module using npm.

```bash
npm install pg-promise
```

--------------------------------

### Install vhost via yarn

Source: https://expressjs.com/es/resources/middleware/vhost

Install the vhost package using yarn.

```bash
yarn add vhost
```

--------------------------------

### Install pg-promise with pnpm

Source: https://expressjs.com/es/guide/database-integration

Installs the pg-promise module using pnpm.

```bash
pnpm add pg-promise
```

--------------------------------

### Install vhost via pnpm

Source: https://expressjs.com/es/resources/middleware/vhost

Install the vhost package using pnpm.

```bash
pnpm add vhost
```

--------------------------------

### Install pg-promise with yarn

Source: https://expressjs.com/es/guide/database-integration

Installs the pg-promise module using yarn.

```bash
yarn add pg-promise
```

--------------------------------

### Install errorhandler via bun

Source: https://expressjs.com/es/resources/middleware/errorhandler

Install the package using bun.

```bash
bun add errorhandler
```

--------------------------------

### Install vhost via npm

Source: https://expressjs.com/es/resources/middleware/vhost

Install the vhost package using npm.

```bash
npm install vhost
```

--------------------------------

### Install sqlite3 package with bun

Source: https://expressjs.com/es/guide/database-integration

Installation command for the sqlite3 module using bun.

```bash
bun add sqlite3
```

--------------------------------

### Install oracledb with yarn

Source: https://expressjs.com/es/guide/database-integration

Installs the oracledb module using yarn.

```bash
yarn add oracledb
```

--------------------------------

### Install oracledb with npm

Source: https://expressjs.com/es/guide/database-integration

Installs the oracledb module using npm.

```bash
npm install oracledb
```

--------------------------------

### Install sqlite3 package

Source: https://expressjs.com/es/guide/database-integration

Installation command for the sqlite3 module using npm.

```bash
npm install sqlite3
```

--------------------------------

### Install nano for CouchDB

Source: https://expressjs.com/es/guide/database-integration

Installation commands for the nano module using various package managers.

```bash
npm install nano
```

```bash
yarn add nano
```

```bash
pnpm add nano
```

```bash
bun add nano
```

--------------------------------

### Install elasticsearch package with bun

Source: https://expressjs.com/es/guide/database-integration

Installation command for the elasticsearch module using bun.

```bash
bun add elasticsearch
```

--------------------------------

### Install Redis module via bun

Source: https://expressjs.com/es/guide/database-integration

Install the redis package using bun.

```bash
bun add redis
```

--------------------------------

### Install Express via npm

Source: https://expressjs.com/es

Use this command to install the Express framework in your Node.js project.

```bash
npm install express
```

--------------------------------

### LevelDB Put and Get Operations

Source: https://expressjs.com/es/guide/database-integration

Examples of performing put and get operations with LevelDB using CommonJS and ESM syntax.

```javascript
const levelup = require('levelup');
const db = levelup('./mydb');


db.put('name', 'LevelUP', (err) => {
  if (err) return console.log('Ooops!', err);


  db.get('name', (err, value) => {
    if (err) return console.log('Ooops!', err);


    console.log(`name=${value}`);
  });
});
```

```javascript
import levelup from 'levelup';


const db = levelup('./mydb');


db.put('name', 'LevelUP', (err) => {
  if (err) return console.log('Ooops!', err);


  db.get('name', (err, value) => {
    if (err) return console.log('Ooops!', err);


    console.log(`name=${value}`);
  });
});
```

--------------------------------

### Instalar serve-static con bun

Source: https://expressjs.com/es/resources/middleware/serve-static

Comando para instalar el paquete usando bun.

```bash
bun add serve-static
```

--------------------------------

### Instalar serve-static con yarn

Source: https://expressjs.com/es/resources/middleware/serve-static

Comando para instalar el paquete usando yarn.

```bash
yarn add serve-static
```

--------------------------------

### Instalar serve-static con pnpm

Source: https://expressjs.com/es/resources/middleware/serve-static

Comando para instalar el paquete usando pnpm.

```bash
pnpm add serve-static
```

--------------------------------

### Instalar Express temporalmente con bun

Source: https://expressjs.com/es/starter/installing

Instala Express sin añadirlo a la lista de dependencias usando bun.

```bash
bun add express --no-save
```

--------------------------------

### Using vhost with connect for static serving

Source: https://expressjs.com/es/resources/middleware/vhost

Example of routing different subdomains to different applications, including a static file server.

```javascript
var connect = require('connect');
var serveStatic = require('serve-static');
var vhost = require('vhost');


var mailapp = connect();


// add middlewares to mailapp for mail.example.com


// create app to serve static files on subdomain
var staticapp = connect();
staticapp.use(serveStatic('public'));


// create main app
var app = connect();


// add vhost routing to main app for mail
app.use(vhost('mail.example.com', mailapp));


// route static assets for "assets-*" subdomain to get
// around max host connections limit on browsers
app.use(vhost('assets-*.example.com', staticapp));


// add middlewares and main usage to app


app.listen(3000);
```

--------------------------------

### Install oracledb with pnpm

Source: https://expressjs.com/es/guide/database-integration

Installs the oracledb module using pnpm.

```bash
pnpm add oracledb
```

--------------------------------

### Create a new Router instance

Source: https://expressjs.com/es/api/router

Demonstrates initializing a router with case-sensitive and strict routing options in CommonJS, ESM, and TypeScript.

```javascript
const express = require('express');
const router = express.Router({ caseSensitive: true, strict: true });


router.get('/events', (req, res) => {
  res.send('events');
});


// mount the router on an app
app.use('/calendar', router);
```

```javascript
import express from 'express';


const router = express.Router({ caseSensitive: true, strict: true });


router.get('/events', (req, res) => {
  res.send('events');
});


// mount the router on an app
app.use('/calendar', router);
```

```typescript
import express, { type Request, type Response } from 'express';


const router = express.Router({ caseSensitive: true, strict: true });


router.get('/events', (req: Request, res: Response) => {
  res.send('events');
});


// mount the router on an app
app.use('/calendar', router);
```

--------------------------------

### CouchDB Database Operations with nano

Source: https://expressjs.com/es/guide/database-integration

Example showing how to create a database, insert a document, and list documents using the nano module.

```javascript
const nano = require('nano')('http://localhost:5984');
nano.db.create('books');
const books = nano.db.use('books');


// Insert a book document in the books database
books.insert({ name: 'The Art of war' }, null, (err, body) => {
  if (err) {
    console.log(err);
  } else {
    console.log(body);
  }
});


// Get a list of all books
books.list((err, body) => {
  if (err) {
    console.log(err);
  } else {
    console.log(body.rows);
  }
});
```

--------------------------------

### Install errorhandler via pnpm

Source: https://expressjs.com/es/resources/middleware/errorhandler

Install the package using pnpm.

```bash
pnpm add errorhandler
```

--------------------------------

### Install errorhandler via yarn

Source: https://expressjs.com/es/resources/middleware/errorhandler

Install the package using yarn.

```bash
yarn add errorhandler
```

--------------------------------

### vhost usage example

Source: https://expressjs.com/es/resources/middleware/vhost

Demonstrates how to use vhost with Connect to handle requests based on hostname patterns and access the req.vhost object.

```javascript
var connect = require('connect');
var vhost = require('vhost');
var app = connect();


app.use(
  vhost('*.*.example.com', function handle(req, res, next) {
    // for match of "foo.bar.example.com:8080" against "*.*.example.com":
    console.dir(req.vhost.host); // => 'foo.bar.example.com:8080'
    console.dir(req.vhost.hostname); // => 'foo.bar.example.com'
    console.dir(req.vhost.length); // => 2
    console.dir(req.vhost[0]); // => 'foo'
    console.dir(req.vhost[1]); // => 'bar'
  })
);
```

--------------------------------

### Install elasticsearch package

Source: https://expressjs.com/es/guide/database-integration

Installation command for the elasticsearch module using npm.

```bash
npm install elasticsearch
```

--------------------------------

### Instalar serve-static con npm

Source: https://expressjs.com/es/resources/middleware/serve-static

Comando para instalar el paquete usando npm.

```bash
npm install serve-static
```

--------------------------------

### Instalar dependencias del proyecto

Source: https://expressjs.com/es/starter/generator

Navegue al directorio del proyecto recién creado e instale las dependencias necesarias.

```bash
$ cd myapp
$ npm install
```

--------------------------------

### Inicializar proyecto con bun

Source: https://expressjs.com/es/starter/installing

Comando para crear el archivo package.json usando bun.

```bash
bun init
```

--------------------------------

### Loading a Logger Middleware

Source: https://expressjs.com/es/guide/writing-middleware

Examples of creating and loading a simple logger middleware using app.use().

```CommonJS
const express = require('express');
const app = express();


const myLogger = function (req, res, next) {
  console.log('LOGGED');
  next();
};


app.use(myLogger);


app.get('/', (req, res) => {
  res.send('Hello World!');
});


app.listen(3000);
```

```ESM
import express from 'express';


const app = express();


const myLogger = function (req, res, next) {
  console.log('LOGGED');
  next();
};


app.use(myLogger);


app.get('/', (req, res) => {
  res.send('Hello World!');
});


app.listen(3000);
```

```TypeScript
import express, { type Express, type Request, type Response, type NextFunction } from 'express';


const app: Express = express();


const myLogger = function (req: Request, res: Response, next: NextFunction) {
  console.log('LOGGED');
  next();
};


app.use(myLogger);


app.get('/', (req: Request, res: Response) => {
  res.send('Hello World!');
});


app.listen(3000);
```

--------------------------------

### Instalar response-time con bun

Source: https://expressjs.com/es/resources/middleware/response-time

Comando para instalar el paquete usando bun.

```bash
bun add response-time
```

--------------------------------

### Serving Files from Multiple Directories

Source: https://expressjs.com/es/api/router

Example of serving static files from multiple directories with precedence.

```javascript
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'files')));
app.use(express.static(path.join(__dirname, 'uploads')));
```

--------------------------------

### Install errorhandler via npm

Source: https://expressjs.com/es/resources/middleware/errorhandler

Install the package using the npm registry.

```bash
npm install errorhandler
```

--------------------------------

### Install CORS package via bun

Source: https://expressjs.com/es/resources/middleware/cors

Install the cors module using bun.

```bash
bun add cors
```

--------------------------------

### Instalar Express con bun

Source: https://expressjs.com/es/starter/installing

Instala Express y lo guarda en las dependencias del proyecto usando bun.

```bash
bun add express
```

--------------------------------

### Install CORS package via pnpm

Source: https://expressjs.com/es/resources/middleware/cors

Install the cors module using pnpm.

```bash
pnpm add cors
```

--------------------------------

### Install CORS package via yarn

Source: https://expressjs.com/es/resources/middleware/cors

Install the cors module using yarn.

```bash
yarn add cors
```

--------------------------------

### Instalar tipos TypeScript con bun

Source: https://expressjs.com/es/resources/middleware/response-time

Instala las definiciones de tipos para TypeScript usando bun.

```bash
bun add --dev @types/response-time
```

--------------------------------

### Install CORS package via npm

Source: https://expressjs.com/es/resources/middleware/cors

Install the cors module using npm.

```bash
npm install cors
```

--------------------------------

### Instalar method-override con bun

Source: https://expressjs.com/es/resources/middleware/method-override

Comando para instalar el paquete a través de bun.

```bash
bun add method-override
```

--------------------------------

### Install elasticsearch package with pnpm

Source: https://expressjs.com/es/guide/database-integration

Installation command for the elasticsearch module using pnpm.

```bash
pnpm add elasticsearch
```

--------------------------------

### Inicializar proyecto con npm

Source: https://expressjs.com/es/starter/installing

Comando para crear el archivo package.json usando npm.

```bash
npm init
```

--------------------------------

### Install elasticsearch package with yarn

Source: https://expressjs.com/es/guide/database-integration

Installation command for the elasticsearch module using yarn.

```bash
yarn add elasticsearch
```

--------------------------------

### Mount a router to a root URL

Source: https://expressjs.com/es/api/router

Shows how to use app.use() to mount a router to a specific path, such as /calendar.

```javascript
// only requests to /calendar/* will be sent to our "router"
app.use('/calendar', router);
```

--------------------------------

### Install sqlite3 package with pnpm

Source: https://expressjs.com/es/guide/database-integration

Installation command for the sqlite3 module using pnpm.

```bash
pnpm add sqlite3
```

--------------------------------

### Instalar dependencias de desarrollo para TypeScript con bun

Source: https://expressjs.com/es/starter/installing

Instala TypeScript y los tipos necesarios para Express y Node.js como dependencias de desarrollo usando bun.

```bash
bun add --dev typescript @types/express @types/node
```

--------------------------------

### SQLite database operations example

Source: https://expressjs.com/es/guide/database-integration

Demonstrates creating an in-memory database, defining a table, inserting data, and querying results.

```javascript
const sqlite3 = require('sqlite3').verbose();
const db = new sqlite3.Database(':memory:');


db.serialize(() => {
  db.run('CREATE TABLE lorem (info TEXT)');
  const stmt = db.prepare('INSERT INTO lorem VALUES (?)');


  for (let i = 0; i < 10; i++) {
    stmt.run(`Ipsum ${i}`);
  }


  stmt.finalize();


  db.each('SELECT rowid AS id, info FROM lorem', (err, row) => {
    console.log(`${row.id}: ${row.info}`);
  });
});


db.close();
```

--------------------------------

### Install sqlite3 package with yarn

Source: https://expressjs.com/es/guide/database-integration

Installation command for the sqlite3 module using yarn.

```bash
yarn add sqlite3
```

--------------------------------

### req.originalUrl with mounting

Source: https://expressjs.com/es/api/request

Demonstrates how req.originalUrl, req.baseUrl, and req.path behave when using app.use with a mount path.

```javascript
// GET 'http://www.example.com/admin/new?sort=desc'
app.use('/admin', (req, res, next) => {
  console.dir(req.originalUrl); // '/admin/new?sort=desc'
  console.dir(req.baseUrl); // '/admin'
  console.dir(req.path); // '/new'
  next();
});
```

```typescript
import { type Request, type Response, type NextFunction } from 'express';


// GET 'http://www.example.com/admin/new?sort=desc'
app.use('/admin', (req: Request, res: Response, next: NextFunction) => {
  console.dir(req.originalUrl); // '/admin/new?sort=desc'
  console.dir(req.baseUrl); // '/admin'
  console.dir(req.path); // '/new'
  next();
});
```

--------------------------------

### Install tedious module via bun

Source: https://expressjs.com/es/guide/database-integration

Install the tedious package using bun.

```bash
bun add tedious
```

--------------------------------

### Install tedious module via pnpm

Source: https://expressjs.com/es/guide/database-integration

Install the tedious package using pnpm.

```bash
pnpm add tedious
```

--------------------------------

### Install tedious module via yarn

Source: https://expressjs.com/es/guide/database-integration

Install the tedious package using yarn.

```bash
yarn add tedious
```

--------------------------------

### Instalar response-time con yarn

Source: https://expressjs.com/es/resources/middleware/response-time

Comando para instalar el paquete usando yarn.

```bash
yarn add response-time
```

--------------------------------

### Install tedious module via npm

Source: https://expressjs.com/es/guide/database-integration

Install the tedious package using npm.

```bash
npm install tedious
```

--------------------------------

### Instalar Express con yarn

Source: https://expressjs.com/es/starter/installing

Instala Express y lo guarda en las dependencias del proyecto usando yarn.

```bash
yarn add express
```

--------------------------------

### Install Redis module via pnpm

Source: https://expressjs.com/es/guide/database-integration

Install the redis package using pnpm.

```bash
pnpm add redis
```

--------------------------------

### Instalar Express temporalmente con npm

Source: https://expressjs.com/es/starter/installing

Instala Express sin añadirlo a la lista de dependencias usando npm.

```bash
npm install express --no-save
```

--------------------------------

### Install Redis module via yarn

Source: https://expressjs.com/es/guide/database-integration

Install the redis package using yarn.

```bash
yarn add redis
```

--------------------------------

### Instalar connect-timeout

Source: https://expressjs.com/es/resources/middleware/timeout

Comandos para instalar el paquete connect-timeout utilizando diferentes gestores de paquetes.

```bash
npm install connect-timeout
```

```bash
yarn add connect-timeout
```

```bash
pnpm add connect-timeout
```

```bash
bun add connect-timeout
```

--------------------------------

### Install Redis module via npm

Source: https://expressjs.com/es/guide/database-integration

Install the redis package using npm.

```bash
npm install redis
```

--------------------------------

### Redis ESM Example

Source: https://expressjs.com/es/guide/database-integration

Example usage of the redis client using ESM syntax.

```javascript
import redis from 'redis';


const client = redis.createClient();


client.on('error', (err) => {
  console.log(`Error ${err}`);
});


client.set('string key', 'string val', redis.print);
client.hset('hash key', 'hashtest 1', 'some value', redis.print);
client.hset(['hash key', 'hashtest 2', 'some other value'], redis.print);


client.hkeys('hash key', (err, replies) => {
  console.log(`${replies.length} replies:`);


  replies.forEach((reply, i) => {
    console.log(`    ${i}: ${reply}`);
  });


  client.quit();
});
```
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