diff --git a/.jshintrc b/.jshintrc
new file mode 100755
index 00000000..103efe8d
--- /dev/null
+++ b/.jshintrc
@@ -0,0 +1,17 @@
+{
+  "browser": false,
+  "node": true,
+  "globals": {
+    "require": true
+  },
+  "predef": {
+  },
+  "eqeqeq": true,
+  "quotmark": true,
+  "smarttabs": true,
+  "trailing": true,
+  "undef": true,
+  "unused": "vars",
+  "eqnull": true,
+  "strict": false
+}
diff --git a/src/core/Grid.js b/src/core/Grid.js
index c31b5ebf..9d5282b2 100644
--- a/src/core/Grid.js
+++ b/src/core/Grid.js
@@ -38,8 +38,7 @@ function Grid(width, height, matrix) {
  */
 Grid.prototype._buildNodes = function(width, height, matrix) {
     var i, j,
-        nodes = new Array(height),
-        row;
+        nodes = new Array(height);
 
     for (i = 0; i < height; ++i) {
         nodes[i] = new Array(width);
@@ -219,8 +218,7 @@ Grid.prototype.clone = function() {
         thisNodes = this.nodes,
 
         newGrid = new Grid(width, height),
-        newNodes = new Array(height),
-        row;
+        newNodes = new Array(height);
 
     for (i = 0; i < height; ++i) {
         newNodes[i] = new Array(width);
diff --git a/src/core/Util.js b/src/core/Util.js
index 615f5dd8..339b6c3a 100644
--- a/src/core/Util.js
+++ b/src/core/Util.js
@@ -142,7 +142,7 @@ function smoothenPath(grid, path) {
         sx, sy,                 // current start coordinate
         ex, ey,                 // current end coordinate
         newPath,
-        i, j, coord, line, testCoord, blocked;
+        i, j, coord, line, testCoord, blocked, lastValidCoord;
 
     sx = x0;
     sy = y0;
diff --git a/src/finders/IDAStarFinder.js b/src/finders/IDAStarFinder.js
index e40beafd..8880859c 100644
--- a/src/finders/IDAStarFinder.js
+++ b/src/finders/IDAStarFinder.js
@@ -1,4 +1,3 @@
-var Util       = require('../core/Util');
 var Heuristic  = require('../core/Heuristic');
 var Node       = require('../core/Node');
 var DiagonalMovement = require('../core/DiagonalMovement');
@@ -112,7 +111,7 @@ IDAStarFinder.prototype.findPath = function(startX, startY, endX, endY, grid) {
             return f;
         }
 
-        if(node == end) {
+        if(node === end) {
             route[depth] = [node.x, node.y];
             return node;
         }
diff --git a/src/finders/JPFAlwaysMoveDiagonally.js b/src/finders/JPFAlwaysMoveDiagonally.js
index 6a1621ea..01e45f7f 100644
--- a/src/finders/JPFAlwaysMoveDiagonally.js
+++ b/src/finders/JPFAlwaysMoveDiagonally.js
@@ -79,7 +79,7 @@ JPFAlwaysMoveDiagonally.prototype._findNeighbors = function(node) {
     var parent = node.parent,
         x = node.x, y = node.y,
         grid = this.grid,
-        px, py, nx, ny, dx, dy,
+        px, py, dx, dy,
         neighbors = [], neighborNodes, neighborNode, i, l;
 
     // directed pruning: can ignore most neighbors, unless forced.
diff --git a/src/finders/JPFMoveDiagonallyIfAtMostOneObstacle.js b/src/finders/JPFMoveDiagonallyIfAtMostOneObstacle.js
index a89adaae..f6976404 100644
--- a/src/finders/JPFMoveDiagonallyIfAtMostOneObstacle.js
+++ b/src/finders/JPFMoveDiagonallyIfAtMostOneObstacle.js
@@ -85,7 +85,7 @@ JPFMoveDiagonallyIfAtMostOneObstacle.prototype._findNeighbors = function(node) {
     var parent = node.parent,
         x = node.x, y = node.y,
         grid = this.grid,
-        px, py, nx, ny, dx, dy,
+        px, py, dx, dy,
         neighbors = [], neighborNodes, neighborNode, i, l;
 
     // directed pruning: can ignore most neighbors, unless forced.
diff --git a/src/finders/JPFMoveDiagonallyIfNoObstacles.js b/src/finders/JPFMoveDiagonallyIfNoObstacles.js
index b22360dd..760cf3a8 100644
--- a/src/finders/JPFMoveDiagonallyIfNoObstacles.js
+++ b/src/finders/JPFMoveDiagonallyIfNoObstacles.js
@@ -89,7 +89,7 @@ JPFMoveDiagonallyIfNoObstacles.prototype._findNeighbors = function(node) {
     var parent = node.parent,
         x = node.x, y = node.y,
         grid = this.grid,
-        px, py, nx, ny, dx, dy,
+        px, py, dx, dy,
         neighbors = [], neighborNodes, neighborNode, i, l;
 
     // directed pruning: can ignore most neighbors, unless forced.
diff --git a/src/finders/JPFNeverMoveDiagonally.js b/src/finders/JPFNeverMoveDiagonally.js
index a006556e..c9991790 100644
--- a/src/finders/JPFNeverMoveDiagonally.js
+++ b/src/finders/JPFNeverMoveDiagonally.js
@@ -55,7 +55,7 @@ JPFNeverMoveDiagonally.prototype._jump = function(x, y, px, py) {
         }
     }
     else {
-        throw new Error("Only horizontal and vertical movements are allowed");
+        throw new Error('Only horizontal and vertical movements are allowed');
     }
 
     return this._jump(x + dx, y + dy, x, y);
@@ -71,7 +71,7 @@ JPFNeverMoveDiagonally.prototype._findNeighbors = function(node) {
     var parent = node.parent,
         x = node.x, y = node.y,
         grid = this.grid,
-        px, py, nx, ny, dx, dy,
+        px, py, dx, dy,
         neighbors = [], neighborNodes, neighborNode, i, l;
 
     // directed pruning: can ignore most neighbors, unless forced.
diff --git a/src/finders/JumpPointFinderBase.js b/src/finders/JumpPointFinderBase.js
index 18396ed9..bcad4cea 100644
--- a/src/finders/JumpPointFinderBase.js
+++ b/src/finders/JumpPointFinderBase.js
@@ -4,7 +4,6 @@
 var Heap       = require('heap');
 var Util       = require('../core/Util');
 var Heuristic  = require('../core/Heuristic');
-var DiagonalMovement = require('../core/DiagonalMovement');
 
 /**
  * Base class for the Jump Point Search algorithm
@@ -73,8 +72,8 @@ JumpPointFinderBase.prototype._identifySuccessors = function(node) {
         neighbors, neighbor,
         jumpPoint, i, l,
         x = node.x, y = node.y,
-        jx, jy, dx, dy, d, ng, jumpNode,
-        abs = Math.abs, max = Math.max;
+        jx, jy, d, ng, jumpNode,
+        abs = Math.abs;
 
     neighbors = this._findNeighbors(node);
     for(i = 0, l = neighbors.length; i < l; ++i) {