diff --git a/server/scanner/AbsMetadataFileScanner.js b/server/scanner/AbsMetadataFileScanner.js
index d9d077c0..037726f6 100644
--- a/server/scanner/AbsMetadataFileScanner.js
+++ b/server/scanner/AbsMetadataFileScanner.js
@@ -55,7 +55,7 @@ class AbsMetadataFileScanner {
           bookMetadata.chapters = abMetadata.chapters
         }
         for (const key in abMetadata.metadata) {
-          if (abMetadata.metadata[key] === undefined) continue
+          if (abMetadata.metadata[key] === undefined || abMetadata.metadata[key] === null) continue
           bookMetadata[key] = abMetadata.metadata[key]
         }
       }
diff --git a/server/scanner/LibraryItemScanData.js b/server/scanner/LibraryItemScanData.js
index c272127f..576280c8 100644
--- a/server/scanner/LibraryItemScanData.js
+++ b/server/scanner/LibraryItemScanData.js
@@ -309,7 +309,7 @@ class LibraryItemScanData {
    * @param {Object} bookMetadata 
    */
   setBookMetadataFromFilenames(bookMetadata) {
-    const keysToMap = ['title', 'subtitle', 'publishedYear']
+    const keysToMap = ['title', 'subtitle', 'publishedYear', 'asin']
     for (const key in this.mediaMetadata) {
       if (keysToMap.includes(key) && this.mediaMetadata[key]) {
         bookMetadata[key] = this.mediaMetadata[key]
diff --git a/server/utils/scandir.js b/server/utils/scandir.js
index df6639e0..21c28b8c 100644
--- a/server/utils/scandir.js
+++ b/server/utils/scandir.js
@@ -8,6 +8,7 @@ const parseNameString = require('./parsers/parseNameString')
  * @typedef LibraryItemFilenameMetadata
  * @property {string} title
  * @property {string} subtitle Book mediaType only
+ * @property {string} asin Book mediaType only
  * @property {string[]} authors Book mediaType only
  * @property {string[]} narrators Book mediaType only
  * @property {string} seriesName Book mediaType only
@@ -237,14 +238,17 @@ function getBookDataFromDir(relPath, parseSubtitle = false) {
   author = (splitDir.length > 0) ? splitDir.pop() : null // There could be many more directories, but only the top 3 are used for naming /author/series/title/
 
   // The  may contain various other pieces of metadata, these functions extract it.
+  var [folder, asin] = getASIN(folder)
   var [folder, narrators] = getNarrator(folder)
   var [folder, sequence] = series ? getSequence(folder) : [folder, null]
   var [folder, publishedYear] = getPublishedYear(folder)
   var [title, subtitle] = parseSubtitle ? getSubtitle(folder) : [folder, null]
 
+
   return {
     title,
     subtitle,
+    asin,
     authors: parseNameString.parse(author)?.names || [],
     narrators: parseNameString.parse(narrators)?.names || [],
     seriesName: series,
@@ -254,27 +258,36 @@ function getBookDataFromDir(relPath, parseSubtitle = false) {
 }
 module.exports.getBookDataFromDir = getBookDataFromDir
 
+/**
+ * Extract narrator from folder name
+ * 
+ * @param {string} folder 
+ * @returns {[string, string]} [folder, narrator]
+ */
 function getNarrator(folder) {
   let pattern = /^(?<title>.*) \{(?<narrators>.*)\}$/
   let match = folder.match(pattern)
   return match ? [match.groups.title, match.groups.narrators] : [folder, null]
 }
 
+/**
+ * Extract series sequence from folder name
+ * 
+ * @example
+ * 'Book 2 - Title - Subtitle'
+ * 'Title - Subtitle - Vol 12'
+ * 'Title - volume 9 - Subtitle'
+ * 'Vol. 3 Title Here - Subtitle'
+ * '1980 - Book 2 - Title'
+ * 'Volume 12. Title - Subtitle'
+ * '100 - Book Title'
+ * '6. Title'
+ * '0.5 - Book Title'
+ * 
+ * @param {string} folder 
+ * @returns {[string, string]} [folder, sequence]
+ */
 function getSequence(folder) {
-  // Valid ways of including a volume number:
-  // [
-  //     'Book 2 - Title - Subtitle',
-  //     'Title - Subtitle - Vol 12',
-  //     'Title - volume 9 - Subtitle',
-  //     'Vol. 3 Title Here - Subtitle',
-  //     '1980 - Book 2 - Title',
-  //     'Volume 12. Title - Subtitle',
-  //     '100 - Book Title',
-  //     '2 - Book Title',
-  //     '6. Title',
-  //     '0.5 - Book Title'
-  // ]
-
   // Matches a valid volume string. Also matches a book whose title starts with a 1 to 3 digit number. Will handle that later.
   let pattern = /^(?<volumeLabel>vol\.? |volume |book )?(?<sequence>\d{0,3}(?:\.\d{1,2})?)(?<trailingDot>\.?)(?: (?<suffix>.*))?$/i
 
@@ -295,6 +308,12 @@ function getSequence(folder) {
   return [folder, volumeNumber]
 }
 
+/**
+ * Extract published year from folder name
+ * 
+ * @param {string} folder 
+ * @returns {[string, string]} [folder, publishedYear]
+ */
 function getPublishedYear(folder) {
   var publishedYear = null
 
@@ -308,12 +327,36 @@ function getPublishedYear(folder) {
   return [folder, publishedYear]
 }
 
+/**
+ * Extract subtitle from folder name
+ * 
+ * @param {string} folder 
+ * @returns {[string, string]} [folder, subtitle]
+ */
 function getSubtitle(folder) {
   // Subtitle is everything after " - "
   var splitTitle = folder.split(' - ')
   return [splitTitle.shift(), splitTitle.join(' - ')]
 }
 
+/**
+ * Extract asin from folder name
+ * 
+ * @param {string} folder 
+ * @returns {[string, string]} [folder, asin]
+ */
+function getASIN(folder) {
+  let asin = null
+
+  let pattern = /(?: |^)\[([A-Z0-9]{10})](?= |$)/ // Matches "[B0015T963C]"
+  const match = folder.match(pattern)
+  if (match) {
+    asin = match[1]
+    folder = folder.replace(match[0], '')
+  }
+  return [folder.trim(), asin]
+}
+
 /**
  * 
  * @param {string} relPath