diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 00000000..a6c57f5f
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1 @@
+*.json
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 00000000..17350214
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,34 @@
+{
+    "env": {
+        "node": true,
+        "browser": true,
+        "mocha": true,
+        "commonjs": true
+    },
+
+    "extends": "eslint:recommended",
+
+    "rules": {
+        "indent": [
+            "error",
+            4,
+            { SwitchCase: 1 }
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "single"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ],
+        "strict": 2,
+        "no-unused-vars": 2,
+        "no-cond-assign": 2,
+        "camelcase": 1
+    }
+}
diff --git a/.npmignore b/.npmignore
index 9daeafb9..8cd94105 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1 +1,2 @@
 test
+.eslint*
diff --git a/lib/html-to-dom-client.js b/lib/html-to-dom-client.js
index 2ead30e0..f6ed615d 100644
--- a/lib/html-to-dom-client.js
+++ b/lib/html-to-dom-client.js
@@ -43,7 +43,8 @@ function formatDOM(nodes, parentNode) {
         };
 
         // set the next node for the previous node (if applicable)
-        if (prevNode = result[i - 1]) {
+        prevNode = result[i - 1];
+        if (prevNode) {
             prevNode.next = nodeObj;
         }
 
diff --git a/package.json b/package.json
index 01f90ff1..a812919b 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "author": "Mark <mark@remarkablemark.org>",
   "main": "index.js",
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "lint": "eslint index.js \"lib/**\" \"test/**\""
   },
   "repository": {
     "type": "git",
@@ -26,6 +27,7 @@
     "htmlparser2": "^3.9.1"
   },
   "devDependencies": {
+    "eslint": "^3.3.1",
     "jsdomify": "^2.1.0",
     "mocha": "^3.0.2",
     "react": "^15.3.0",
diff --git a/test/helpers.js b/test/helpers.js
index ac21dba0..aa766877 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -30,9 +30,9 @@ describe('test helper', function() {
             var obj1;
             var obj2;
 
-            var obj1 = { foo: 'bar', baz: ['qux', 42, null], obj: {} };
+            obj1 = { foo: 'bar', baz: ['qux', 42, null], obj: {} };
             obj1.ref = obj1.obj;
-            var obj2 = { obj: {}, baz: ['qux', 42, null], foo: 'bar' };
+            obj2 = { obj: {}, baz: ['qux', 42, null], foo: 'bar' };
             obj2.ref = obj2.obj;
             deepEqualCircular(obj1, obj2);
         });
diff --git a/test/helpers/index.js b/test/helpers/index.js
index d9905bea..e6cd4ba8 100644
--- a/test/helpers/index.js
+++ b/test/helpers/index.js
@@ -4,6 +4,7 @@
  * Module dependencies.
  */
 var assert = require('assert');
+var util = require('util');
 
 /**
  * Test for deep equality between objects that have circular references.
diff --git a/test/utilities.js b/test/utilities.js
index 52c45387..c19bca18 100644
--- a/test/utilities.js
+++ b/test/utilities.js
@@ -30,7 +30,7 @@ describe('utilties', function() {
             [undefined, null, 1337, {}, []].forEach(function(parameter) {
                 assert.throws(function() { camelCase(parameter); });
             });
-        })
+        });
     });
 
     describe('`invertObject` helper', function() {
@@ -40,7 +40,7 @@ describe('utilties', function() {
             [undefined, null, 'foo', 1337].forEach(function(parameter) {
                 assert.throws(function() { invertObject(parameter); });
             });
-        })
+        });
 
         it('swaps key with value for object', function() {
             assert.deepEqual(
@@ -67,7 +67,7 @@ describe('utilties', function() {
 
         it('uses override if valid', function() {
             assert.deepEqual(
-                invertObject({ foo: 'bar', baz: 'qux' }, function(key, value) {
+                invertObject({ foo: 'bar', baz: 'qux' }, function(key) {
                     if (key === 'foo') {
                         return ['key', 'value'];
                     }
@@ -78,7 +78,7 @@ describe('utilties', function() {
 
         it('does not use override if invalid', function() {
             assert.deepEqual(
-                invertObject({ foo: 'bar', baz: 'qux' }, function(key, value) {
+                invertObject({ foo: 'bar', baz: 'qux' }, function(key) {
                     if (key === 'foo') {
                         return ['key'];
                     } else if (key === 'baz') {