Check for current Node Version

Question

I need to programmatically access the current node version running in a library I am writing. Can\'t seem to find this in the docs.

Answer 1

I had the similar issue with my codebase. I wanted to know the current NodeJs version I am going to use to run my server at runtime. For that, I wrote a code which can be run before starting the Server using npm run start script. Found below code helpful from this question.

'use strict';
const semver = require('semver');
const engines = require('./package').engines;
const nodeVersion = engines.node;

// Compare installed NodeJs version with required NodeJs version.
if (!semver.satisfies(process.version, nodeVersion)) {
  console.log(`NodeJS Version Check: Required node version ${nodeVersion} NOT SATISFIED with current version ${process.version}.`);
  process.exit(1);
} else {
  console.log(`NodeJS Version Check: Required node version ${nodeVersion} SATISFIED with current version ${process.version}.`);
}

My package.json looks like this:

{
  "name": "echo-server",
  "version": "1.0.0",
  "engines": {
    "node": "8.5.0",
    "npm": "5.3.0"
  },
  "description": "",
  "main": "index.js",
  "scripts": {
    "check-version" : "node checkVersion.js",
    "start-server" : "node app.js"
    "start" : "npm run check-version && npm run start-server",
    "test": "npm run check-version && echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bluebird": "^3.5.1",
    "express": "^4.16.3",
    "good-guy-http": "^1.10.3",
    "semver": "^5.5.0"
  }
}

Do run npm install command before you run npm run start command to run your project.