npm install --save detect-node
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.