2.23.13. Node.js
For business hosting only
Node.js is only available on businesshosting and is included in the price of the tariff. At change of tariff to regular sites on Node.js will stop working.How Node.js works on hosting
- Or the path to the socket (taken from the page Node.js settings).
- Either the path from the environment variable
process.env.PORT
(contains the path to the socket).
- The request goes to the public server on port 80 or 443.
- Based on the hostname, redirects to the socket of the desired site.
- The application receives data over the socket, processes it, and returns a response.
Application launch order
- Openup site settings.
- Place application files in root directory site - download the files of the finished project or install using npm.
- Add a script with the command
start
inpackage.json
- Clickon "Restart" in Node.js settings.
General information
npm
Warning!
- npm is installed in the hosting account after installing Node.js as a web server or changing its version in site settings.
- For correct operation of Node.js to the file
.bashrc
lines with NVM configuration are automatically added. - If node and npm are not visible in the console — make sure that the files exist in the hosting account
.bashrc
and.bash_profile
and they are error free.
npm - Node.js package manager.
Commands:
npm -v
— view the current version of npm.npm install package
(илиnpm i package
) — install the package. After installation, a subdirectory will appearnode_modules
where the installed module will be located.npm uninstall package
- package removal.
package.json
package.json
— configuration file and npm package management.
Options:
name
(mandatory) — the name of the application in small Latin letters without spaces, symbols can be used to separate words-
and_
.description
— application description.dependencies
— section with information about all packages used by the application.
Team npm init
- creates a file from scratch. All necessary data is requested before creation. At the end, you need to familiarize yourself with the contents of the future file and if everything is in order, enter yes
. Note You can just click on all the questions Enter, then a file with standard content will be created.
Node.js settings
App status
- "App status" - the current status of the Node.js service:
- "Running" - the service is up and running.
- "Stopped" — not started (for example, due to the lack of
package.json
) or stopped due to an error.
- "Command to run" — the presence of a script with a command
start
in filepackage.json
:- "Present" - found.
- "Missing" — not found.
- "Force restart" - service restart. Warning! You need to click after any file changes.
- "Forced stop" - stopping the service. The button is displayed only when the application is running.
Main settings
- The path to the socket.
- The name of an environment variable containing the path to the socket. Note Pushed to every application when it starts.
- Sample code that should be in an application to listen for site traffic.
App start
Block "App start" - contains the command to be added to package.json
to run the application (./index.js
in the command - the path to the main application file, the file name can be anything):
Your package.json
Block "Your package.json" - shows the current content of the file package.json
of root directory site (updated when opening or reloading the settings page):
If syntax errors are found in the file in the block, a notification will be displayed "File contains errors"... The presence of an error notification while the application is running means that the application was launched before the error appeared in the file.
App logs
Block "App logs" - displaying application logs in real time. Includes information that the application writes to the console while it is running.
Application examples
Hello, World!
- Create in root directory site two files:
- Configuration file
package.json
:{ "name": "node", "version": "1.0.0", "scripts": { "start": "node ./index.js" } }
- Application file
index.js
:const HTTP = require('http'); const WebServer = HTTP.createServer((req, res) => { res.statusCode = 200; res.setHeader('Content-Type', 'text/plain'); res.end('Hello, World!'); }); WebServer.listen(process.env.PORT, () => { console.log(`Server is running.`); });
- Clickon "Restart" in Node.js settings.
- Open the site in a browser. If everything is ok, you will see the text "Hello, World!".
Using npm and express framework
- Connect to hosting via SSH.
- Go to root directory site with a command of the form:
cd example.com/www
Where
example.com
- Name of the site,www
- its subdomain. - Initialize npm and install the express framework with the command:
npm init && npm i express
- Create in root directory site application file
index.js
:const express = require("express"); const app = express(); app.get("/", function(request, response){ response.end("Hello from Express!"); }); app.listen(process.env.PORT);
- Edit the file
package.json
and add a launch command of the form to it:"scripts": { "start": "node ./index.js" }
Observe JSON syntax when adding a command!
The command needs to be added not just to the end of the file, and following the standard JSON format syntax:- Section
scripts
should not be duplicated. If it is already in the file, add the commandstart
there. - There must be a comma at the end of the previous line at the same nesting level.
- The nesting order of the parentheses must be correct.
- Clickon "Restart" in Node.js settings.
- Open the site in a browser. If everything is ok, you will see the text "Hello from Express!".