diff --git a/server/middleware/validatePackageName.js b/server/middleware/validatePackageName.js
index ca89025..b32405d 100644
--- a/server/middleware/validatePackageName.js
+++ b/server/middleware/validatePackageName.js
@@ -4,10 +4,11 @@ const validateNpmPackageName = require("validate-npm-package-name");
  * Reject requests for invalid npm package names.
  */
 function validatePackageName(req, res, next) {
-  const nameErrors = validateNpmPackageName(req.packageName).errors;
+  const errors = validateNpmPackageName(req.packageName).errors;
+
+  if (errors) {
+    const reason = errors.join(", ");
 
-  if (nameErrors) {
-    const reason = nameErrors.join(", ");
     return res
       .status(403)
       .type("text")
diff --git a/server/utils/createPackageURL.js b/server/utils/createPackageURL.js
index d9eceb8..8616f43 100644
--- a/server/utils/createPackageURL.js
+++ b/server/utils/createPackageURL.js
@@ -1,8 +1,10 @@
 function createPackageURL(packageName, version, pathname, search) {
   let url = `/${packageName}`;
+
   if (version != null) url += `@${version}`;
   if (pathname) url += pathname;
   if (search) url += search;
+
   return url;
 }
 
diff --git a/server/utils/getPackage.js b/server/utils/getPackage.js
index 4d60054..d410441 100644
--- a/server/utils/getPackage.js
+++ b/server/utils/getPackage.js
@@ -32,15 +32,15 @@ const fetchMutex = createMutex((packageConfig, callback) => {
         callback(error);
       }
     } else {
-      lockfile.check(outputDir).then(isLocked => {
-        if (isLocked) {
+      lockfile.check(outputDir).then(locked => {
+        if (locked) {
           // Another process on this same machine has locked the
           // directory. We need to wait for it to be unlocked
           // before we callback.
           const timer = setInterval(() => {
             lockfile.check(outputDir).then(
-              isLocked => {
-                if (!isLocked) {
+              locked => {
+                if (!locked) {
                   clearInterval(timer);
                   callback(null, outputDir);
                 }
diff --git a/server/utils/incrementCounter.js b/server/utils/incrementCounter.js
index cec400c..0868061 100644
--- a/server/utils/incrementCounter.js
+++ b/server/utils/incrementCounter.js
@@ -1,6 +1,6 @@
 const db = require("./redis");
 
-function incrementCounter(counter, key, by) {
+function incrementCounter(counter, key, by = 1) {
   return new Promise((resolve, reject) => {
     db.hincrby(counter, key, by, (error, value) => {
       if (error) {
diff --git a/server/utils/renderPage.js b/server/utils/renderPage.js
index c62a827..a5ae2df 100644
--- a/server/utils/renderPage.js
+++ b/server/utils/renderPage.js
@@ -7,6 +7,7 @@ function renderPage(page, props) {
   const html = ReactDOMServer.renderToStaticMarkup(
     React.createElement(page, props)
   );
+
   return doctype + html;
 }