App - Expressjs — ContextQMD

<h2 id="app">Application</h2>

The app object conventionally denotes the Express application. Create it by calling the top-level express() function exported by the Express module:

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.send('hello world')
})

app.listen(3000)

The app object has methods for

Routing HTTP requests; see for example, app.METHOD and app.param.
Configuring middleware; see app.route.
Rendering HTML views; see app.render.
Registering a template engine; see app.engine.

It also has settings (properties) that affect how the application behaves; for more information, see Application settings.

<div class="doc-box doc-info" markdown="1"> The Express application object can be referred from the [request object](#req) and the [response object](#res) as `req.app`, and `res.app`, respectively. </div> <h3 id='app.properties'>Properties</h3> <section markdown="1"> {% include api/en/5x/app-locals.md %} </section> <section markdown="1"> {% include api/en/5x/app-mountpath.md %} </section> <section markdown="1"> {% include api/en/5x/app-router.md %} </section> <h3 id='app.events'>Events</h3> <section markdown="1"> {% include api/en/5x/app-onmount.md %} </section> <h3 id='app.methods'>Methods</h3> <section markdown="1"> {% include api/en/5x/app-all.md %} </section> <section markdown="1"> {% include api/en/5x/app-delete-method.md %} </section> <section markdown="1"> {% include api/en/5x/app-disable.md %} </section> <section markdown="1"> {% include api/en/5x/app-disabled.md %} </section> <section markdown="1"> {% include api/en/5x/app-enable.md %} </section> <section markdown="1"> {% include api/en/5x/app-enabled.md %} </section> <section markdown="1"> {% include api/en/5x/app-engine.md %} </section> <section markdown="1"> {% include api/en/5x/app-get.md %} </section> <section markdown="1"> {% include api/en/5x/app-get-method.md %} </section> <section markdown="1"> {% include api/en/5x/app-listen.md %} </section> <section markdown="1"> {% include api/en/5x/app-METHOD.md %} </section> <section markdown="1"> {% include api/en/5x/app-param.md %} </section> <section markdown="1"> {% include api/en/5x/app-path.md %} </section> <section markdown="1"> {% include api/en/5x/app-post-method.md %} </section> <section markdown="1"> {% include api/en/5x/app-put-method.md %} </section> <section markdown="1"> {% include api/en/5x/app-render.md %} </section> <section markdown="1"> {% include api/en/5x/app-route.md %} </section> <section markdown="1"> {% include api/en/5x/app-set.md %} </section> <section markdown="1"> {% include api/en/5x/app-use.md %} </section>