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108 lines
2.0 KiB
Markdown
108 lines
2.0 KiB
Markdown
---
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title: Node.js
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homepage: https://nodejs.org
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tagline: |
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Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.
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---
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To update or switch versions, run `webi node@<tag>`. \
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(you can use `@lts` for long-term support, `@beta` for pre-releases, or `@x.y.z`
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for a specific version)
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## Cheat Sheet
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> Node is great for simple, snappy HTTP(S) servers, and for stitching APIs
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> together with minimal fuss or muss.
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Installing node via webi will:
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- pick a compatible version from the
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[Node Releases API](https://nodejs.org/dist/index.tab)
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- download and unpack to `$HOME/.local/opt/node/`
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- update your `PATH` in `$HOME/.config/envman/PATH.env`
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- run `npm config set scripts-prepend-node-path=true`
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- (prevents conflicts with other installed node versions)
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- absolutely leave system file permissions alone
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- (no dreaded `sudo npm` permission errors)
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### Hello World
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```sh
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node -e 'console.log("Hello, World!")'
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> Hello, World!
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```
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### A Simple Web Server
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`server.js`:
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```sh
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var http = require('http');
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var app = function (req, res) {
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res.end('Hello, World!');
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};
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http.createServer(app).listen(8080, function () {
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console.info('Listening on', this.address());
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});
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```
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```sh
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node server.js
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```
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### Generate a Secure Random Key
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This generates a hex-encoded 128-bit random key.
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```sh
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node -p 'crypto.randomBytes(16).toString("hex")'
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```
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This generates a url-safe base64 256-bit random key.
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```sh
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node -p 'crypto.randomBytes(32).toString("base64")
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.replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "")'
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```
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### An Express App
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```sh
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mkdir my-server
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pushd my-server/
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npm init
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npm install --save express
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```
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`app.js`:
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```js
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'use strict';
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var express = require('express');
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var app = express();
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app.use('/', function (req, res, next) {
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res.end('Hello, World!');
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});
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module.exports = app;
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```
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`server.js`:
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```js
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'use strict';
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var http = require('http');
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var app = require('./app.js');
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http.createServer(app).listen(8080, function () {
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console.info('Listening on', this.address());
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});
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```
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```sh
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npm start
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```
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