detect-node

Install

npm install --save detect-node

Usage:

var isNode = require('detect-node');

if (isNode) {
  console.log("Running under Node.JS");
} else {
  alert("Hello from browser (or whatever not-a-node env)");
}

The check is performed as:

module.exports = false;

// Only Node.JS has a process variable that is of [[Class]] process
try {
 module.exports = Object.prototype.toString.call(global.process) === '[object process]' 
} catch(e) {}

Thanks to Ingvar Stepanyan for the initial idea. This check is both the most reliable I could find and it does not use process env directly, which would cause browserify to include it into the build.

Similar packages

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is-node

is-node is a package similar to detect-node that provides a simple check to see if the code is running in Node.js. It compares to detect-node by offering the same basic functionality but may have different implementation details or additional features.

is-node-process

is-node-process is another package that serves the same purpose as detect-node. It checks if the current process is a Node.js process. The difference may lie in the specific method of detection and any additional checks or features it provides.