diff --git a/README.md b/README.md
index fe23119..115ce0d 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ $ npm install add-dependencies [-g]
 
 ### Usage
 
-Run:
+Run (for `nodejs` see Example):
 
 ```sh
 $ add-dependencies [package_file] <dependencies> [target] [--no-overwrite]
@@ -46,3 +46,31 @@ or with `npx`:
 ```sh
 $ npx add-dependencies /home/user/project/package.json moment@2.0.0 react@16.8 redux eslint --dev
 ```
+
+or via nodejs
+
+```js
+const npmAdd = require('add-dependencies');
+```
+OR
+
+```js
+// Note: to use import you must have `"type": "module"` in your projects package.json
+import npmAdd from 'add-dependencies';
+```
+
+THEN
+
+```js
+const dependencies = [
+    'package1',
+    'package2',
+    'package3',
+];
+const target = npmAdd.CONSTANTS.DEPENDENCIES;
+const overwrite = false;
+const packageFilePath = 'package.json';
+new npmAdd(dependencies, target, overwrite, packageFilePath)
+    .run()
+    .then(() => console.log('completed'));
+```
\ No newline at end of file
diff --git a/cli-index.js b/cli-index.js
new file mode 100644
index 0000000..c4b8d38
--- /dev/null
+++ b/cli-index.js
@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+
+const AddDependencies = require('./lib/AddDependencies');
+
+console.log(
+  '\x1b[33m%s\x1b[0m',
+  'This script adds dependencies (latest or specified versions) to the package.json file skipping the installation process.'
+);
+
+const app = new AddDependencies();
+
+app.run().catch((error) => {
+  console.error('\x1b[31m%s\x1b[0m', error);
+  process.exit(1);
+});
\ No newline at end of file
diff --git a/index.js b/index.js
index 1e8cf44..335aa32 100755
--- a/index.js
+++ b/index.js
@@ -1,11 +1,3 @@
 #!/usr/bin/env node
-const AddDependencies = require('./lib/AddDependencies');
 
-console.log('\x1b[33m%s\x1b[0m', 'This script adds dependencies (latest or specified versions) to the package.json file skipping the installation process.');
-
-const app = new AddDependencies();
-
-app.addDependencies().then(app.saveToPackage.bind(app)).catch((error) => {
-  console.error('\x1b[31m%s\x1b[0m', error);
-  process.exit(1);
-});
+module.exports = require('./lib/AddDependencies');
\ No newline at end of file
diff --git a/lib/AddDependencies.js b/lib/AddDependencies.js
index 8b78554..5f41b22 100644
--- a/lib/AddDependencies.js
+++ b/lib/AddDependencies.js
@@ -3,12 +3,17 @@ const semver = require('semver');
 const Files = require('./Files');
 
 class AddDependencies {
-  constructor() {
+  constructor(
+    dependencies = [],
+    target = 'dependencies',
+    overwrite = true,
+    packageFilePath = './package.json'
+  ) {
     this.result = {};
-    this.dependencies = [];
-    this.target = 'dependencies';
-    this.overwrite = true;
-    this.packageFilePath = './package.json';
+    this.dependencies = dependencies;
+    this.target = target;
+    this.overwrite = overwrite;
+    this.packageFilePath = packageFilePath;
   }
 
   addDependencies() {
@@ -59,7 +64,20 @@ class AddDependencies {
     return Promise.all(this.dependencies.map((dep) => this.runNpmShow(dep)));
   }
 
+  run() {
+    return this.addDependencies().then(() => this.saveToPackage());
+  }
+
   runNpmShow(dep) {
+    if (!dep) {
+      console.error(
+        '\x1b[31m%s\x1b[0m',
+        `No Dependency Provided to runNpmShow()`
+      );
+
+      return new Promise((resolve) => resolve());
+    }
+
     const depSplit = dep.split('@');
     const [depName, depVersion] = dep.charAt(0) !== '@' ? depSplit : [`@${depSplit[1]}`, depSplit[2]];
 
@@ -158,6 +176,15 @@ class AddDependencies {
       process.exit(1);
     });
   }
+
+  static get CONSTANTS() {
+    return {
+      DEPENDENCIES: 'dependencies',
+      DEV_DEPENDENCIES: 'devDependencies',
+      PEER_DEPENDENCIES: 'peerDependencies',
+      OPTIONAL_DEPENDENCIES: 'optionalDependencies',
+    };
+  }
 }
 
 module.exports = AddDependencies;
diff --git a/package.json b/package.json
index 6fa9dc1..f6b4f05 100644
--- a/package.json
+++ b/package.json
@@ -23,10 +23,10 @@
   "license": "MIT",
   "preferGlobal": true,
   "bin": {
-    "add-dependencies": "index.js"
+    "add-dependencies": "cli-index.js"
   },
   "dependencies": {
     "npm-run": "^5.0.1",
     "semver": "^6.3.0"
   }
-}
+}
\ No newline at end of file