Added node code

.npmignore

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+.generate
+disposable.go
+domains.txt
+README.md

disposable.js

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+'use strict';
+
+var domainMap = {};
+for (let d of require('./domains')) {
+    domainMap[d] = null;
+}
+
+module.exports = {
+    validate: (domain, callback) => {
+        if (!callback) {
+            return domainMap.hasOwnProperty(domain);
+        }
+        callback(null, domainMap.hasOwnProperty(domain));
+    }
+}

package.json

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+{
+  "name": "disposable-email",
+  "version": "0.1.0",
+  "description": "Disposable email domains",
+  "main": "disposable.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/andreis/disposable.git"
+  },
+  "keywords": [
+    "email",
+    "disposable",
+    "temporary",
+    "validation",
+    "mail"
+  ],
+  "author": "Andrei Simionescu <ansimionescu@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/andreis/disposable/issues"
+  },
+  "homepage": "https://github.com/andreis/disposable#readme"
+}