diff --git a/README.md b/README.md
index 3c1c73f..338336d 100644
--- a/README.md
+++ b/README.md
@@ -45,11 +45,11 @@ pdf.create(html).toFile([filepath, ]function(err, res){
   console.log(res.filename);
 });
 
-pdf.create(html).toStream(function(err, stream){
+pdf.create(html).toStream(function(err, stream, res){
   stream.pipe(fs.createWriteStream('./foo.pdf'));
 });
 
-pdf.create(html).toBuffer(function(err, buffer){
+pdf.create(html).toBuffer(function(err, buffer, res){
   console.log('This is a buffer:', Buffer.isBuffer(buffer));
 });
 
@@ -132,6 +132,7 @@ config = {
   "phantomArgs": [], // array of strings used as phantomjs args e.g. ["--ignore-ssl-errors=yes"]
   "script": '/url',           // Absolute path to a custom phantomjs script, use the file in lib/scripts as example
   "timeout": 30000,           // Timeout that will cancel phantomjs, in milliseconds
+  "evaluateScript": "function () { console.log(document.title) }", // Evaluate a script in the context of the web page (console.log are collected in consoleMessages field in the JSON returned by the callback: res)
 
   // HTTP Headers that are used for requests
   "httpHeaders": {
diff --git a/bin/index.js b/bin/index.js
index d8b7661..1c0d62c 100755
--- a/bin/index.js
+++ b/bin/index.js
@@ -28,5 +28,6 @@ function htmlpdf (source, destination) {
   }
   pdf.create(html, options).toFile(destination, function (err, res) {
     if (err) throw err
+    if (res) console.log(JSON.stringify(res))
   })
 }
diff --git a/lib/pdf.js b/lib/pdf.js
index 9195e7f..abd7fe5 100644
--- a/lib/pdf.js
+++ b/lib/pdf.js
@@ -47,7 +47,8 @@ PDF.prototype.toBuffer = function PdfToBuffer (callback) {
       if (err) return callback(err)
       fs.unlink(res.filename, function unlinkPdfFile (err) {
         if (err) return callback(err)
-        callback(null, buffer)
+        delete res.filename
+        callback(null, buffer, res)
       })
     })
   })
@@ -62,13 +63,15 @@ PDF.prototype.toStream = function PdfToStream (callback) {
       return callback(err)
     }
 
+    var filename = res.filename
     stream.on('end', function () {
-      fs.unlink(res.filename, function (err) {
+      fs.unlink(filename, function (err) {
         if (err) console.log('html-pdf:', err)
       })
     })
 
-    callback(null, stream)
+    delete res.filename
+    callback(null, stream, res)
   })
 }
 
diff --git a/lib/scripts/pdf_a4_portrait.js b/lib/scripts/pdf_a4_portrait.js
index a9197c4..78f7ee6 100755
--- a/lib/scripts/pdf_a4_portrait.js
+++ b/lib/scripts/pdf_a4_portrait.js
@@ -57,6 +57,15 @@ page.onLoadFinished = function (status) {
   // The paperSize object must be set at once
   page.paperSize = definePaperSize(getContent(page), options)
 
+  // Collect console.log messages in rendered web page and custom script
+  var consoleMessages = []
+  page.onConsoleMessage = function (msg) {
+    consoleMessages.push(msg)
+  }
+
+  // Evaluate custom JavaScript
+  if (options.evaluateScript) page.evaluateJavaScript(options.evaluateScript)
+
   // Output to parent process
   var fileOptions = {
     type: options.type || 'pdf',
@@ -65,7 +74,7 @@ page.onLoadFinished = function (status) {
 
   var filename = options.filename || (options.directory || '/tmp') + '/html-pdf-' + system.pid + '.' + fileOptions.type
   page.render(filename, fileOptions)
-  system.stdout.write(JSON.stringify({filename: filename}))
+  system.stdout.write(JSON.stringify({filename: filename, consoleMessages: consoleMessages}))
 
   exit(null)
 }