diff --git a/bower.json b/bower.json
index 331b065ca..ffd5637f6 100644
--- a/bower.json
+++ b/bower.json
@@ -22,7 +22,8 @@
     "mousetrap": "1.4.6",
     "zeroclipboard": "~1.3.5",
     "ng-idle": "*",
-    "underscore": "~1.7.0"
+    "underscore": "~1.7.0",
+    "assert": "~0.1.0"
   },
   "resolutions": {
     "angular": "=1.2.19"
diff --git a/js/log.js b/js/log.js
index 8a83b9a2e..52930efe2 100644
--- a/js/log.js
+++ b/js/log.js
@@ -1,5 +1,22 @@
 var config = require('../config');
+var _ = require('underscore');
 
+/**
+ * @desc
+ * A simple logger that wraps the <tt>console.log</tt> methods when available.
+ *
+ * Usage:
+ * <pre>
+ *   log = new Logger('copay');
+ *   log.setLevel('info');
+ *   log.debug('Message!'); // won't show
+ *   log.setLevel('debug');
+ *   log.debug('Message!', 1); // will show '[debug] copay: Message!, 1'
+ * </pre>
+ *
+ * @param {string} name - a name for the logger. This will show up on every log call
+ * @constructor
+ */
 var Logger = function(name) {
   this.name = name || 'log';
   this.level = 2;
@@ -14,15 +31,15 @@ var levels = {
   'fatal': 5
 };
 
-Object.keys(levels).forEach(function(level) {
-  Logger.prototype[level] = function() {
-    if (levels[level] >= levels[this.level]) {
-      var str = '[' + level + '] ' + this.name + ': ' + arguments[0],
+_.each(levels, function(level, levelName) {
+  Logger.prototype[levelName] = function() {
+    if (level >= levels[this.level]) {
+      var str = '[' + levelName + '] ' + this.name + ': ' + arguments[0],
         extraArgs,
       extraArgs = [].slice.call(arguments, 1);
-      if (console[level]) {
+      if (console[levelName]) {
         extraArgs.unshift(str);
-        console[level].apply(console, extraArgs);
+        console[levelName].apply(console, extraArgs);
       } else {
         if (extraArgs.length) {
           str += JSON.stringify(extraArgs);
@@ -33,9 +50,54 @@ Object.keys(levels).forEach(function(level) {
   };
 });
 
+/**
+ * @desc
+ * Sets the level of a logger. A level can be any bewteen: 'debug', 'info', 'log',
+ * 'warn', 'error', and 'fatal'. That order matters: if a logger's level is set to
+ * 'warn', calling <tt>level.debug</tt> won't have any effect.
+ *
+ * @param {number} level - the name of the logging level
+ */
 Logger.prototype.setLevel = function(level) {
   this.level = level;
-}
+};
+
+/**
+ * @class Logger
+ * @method debug
+ * @desc Log messages at the debug level.
+ * @param {*} args - the arguments to be logged.
+ */
+/**
+ * @class Logger
+ * @method info
+ * @desc Log messages at the info level.
+ * @param {*} args - the arguments to be logged.
+ */
+/**
+ * @class Logger
+ * @method log
+ * @desc Log messages at an intermediary level called 'log'.
+ * @param {*} args - the arguments to be logged.
+ */
+/**
+ * @class Logger
+ * @method warn
+ * @desc Log messages at the warn level.
+ * @param {*} args - the arguments to be logged.
+ */
+/**
+ * @class Logger
+ * @method error
+ * @desc Log messages at the error level.
+ * @param {*} args - the arguments to be logged.
+ */
+/**
+ * @class Logger
+ * @method fatal
+ * @desc Log messages at the fatal level.
+ * @param {*} args - the arguments to be logged.
+ */
 
 var logger = new Logger('copay');
 logger.setLevel(config.logLevel);
diff --git a/karma.conf.js b/karma.conf.js
index bc467f9bb..ba13832ef 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -28,6 +28,7 @@ module.exports = function(config) {
       'lib/angular-route/angular-route.min.js',
       'lib/angular-foundation/mm-foundation.min.js',
       'lib/angular-foundation/mm-foundation-tpls.min.js',
+      'lib/assert/assert.js',
       'lib/bitcore.js',
       'lib/underscore/underscore.js',
       'lib/crypto-js/rollups/sha256.js',
diff --git a/package.json b/package.json
index c970b0737..10ffd2da7 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   },
   "version": "0.4.7",
   "dependencies": {
+    "assert": "^1.1.2",
     "browser-request": "^0.3.2",
     "mocha": "^1.18.2",
     "mocha-lcov-reporter": "0.0.1",
diff --git a/util/build.js b/util/build.js
index c3b8b7bd6..d585219d6 100644
--- a/util/build.js
+++ b/util/build.js
@@ -46,11 +46,18 @@ var createBundle = function(opts) {
   b.require('underscore', {
     expose: 'underscore'
   });
+  b.require('assert', {
+    expose: 'assert'
+  });
 
   b.require('./copay', {
     expose: 'copay'
   });
   b.require('./version');
+
+  b.require('./js/log', {
+    expose: '../js/log'
+  });
   //  b.external('bitcore');
   b.require('./js/models/core/WalletFactory', {
     expose: '../js/models/core/WalletFactory'