diff --git a/Cargo.lock b/Cargo.lock
index 9f13680..1bb22a3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,12 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
+[[package]]
+name = "anyhow"
+version = "1.0.99"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0674a1ddeecb70197781e945de4b3b8ffb61fa939a5597bcf48503737663100"
+
 [[package]]
 name = "arrayvec"
 version = "0.7.6"
@@ -477,6 +483,7 @@ dependencies = [
 name = "droplet"
 version = "0.7.0"
 dependencies = [
+ "anyhow",
  "boa_engine",
  "dyn-clone",
  "flate2",
@@ -925,6 +932,7 @@ version = "3.0.0-beta.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca1763658b41abbdf10caaa63b74e58f4ec62d52b889a558e0af6f3638cc9426"
 dependencies = [
+ "anyhow",
  "bitflags",
  "ctor",
  "futures-core",
diff --git a/Cargo.toml b/Cargo.toml
index 5db0834..d6f1f3b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,11 +9,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 # Default enable napi4 feature, see https://nodejs.org/api/n-api.html#node-api-version-matrix
-napi = { version = "3.0.0-beta.11", default-features = false, features = [
-    "napi6",
-    "async",
-    "web_stream",
-] }
+napi = { version = "3.0.0-beta.11", default-features = false, features = ["napi6", "async", "web_stream", "error_anyhow"] }
 napi-derive = "3.0.0-beta.11"
 hex = "0.4.3"
 md5 = "0.7.0"
@@ -30,6 +26,7 @@ rhai = "1.22.2"
 mlua = { version = "0.11.2", features = ["luajit"] }
 boa_engine = "0.20.0"
 serde_json = "1.0.143"
+anyhow = "1.0.99"
 
 [package.metadata.patch]
 crates = ["rawzip"]
diff --git a/src/lib.rs b/src/lib.rs
index 7e07735..a3f390e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,10 +1,14 @@
-#![deny(clippy::all)]
+#![deny(clippy::unwrap_used)]
+#![deny(clippy::expect_used)]
+#![deny(clippy::panic)]
 #![feature(trait_alias)]
 
+use std::{any, io};
+
 pub mod manifest;
+pub mod script;
 pub mod ssl;
 pub mod version;
-pub mod script;
 
 #[macro_use]
-extern crate napi_derive;
+extern crate napi_derive;
\ No newline at end of file
diff --git a/src/manifest.rs b/src/manifest.rs
index b077906..1b83c99 100644
--- a/src/manifest.rs
+++ b/src/manifest.rs
@@ -35,7 +35,7 @@ pub fn generate_manifest<'a>(
   progress_sfn: ThreadsafeFunction<i32>,
   log_sfn: ThreadsafeFunction<String>,
   callback_sfn: ThreadsafeFunction<String>,
-) -> Result<()> {
+) -> anyhow::Result<()> {
   let backend: &mut Box<dyn VersionBackend + Send> = droplet_handler
     .create_backend_for_path(dir)
     .ok_or(napi::Error::from_reason(
@@ -49,83 +49,94 @@ pub fn generate_manifest<'a>(
     unsafe { std::mem::transmute(backend) };
 
   thread::spawn(move || {
-    let files = backend.list_files();
+    let callback_borrow = &callback_sfn;
 
-    // Filepath to chunk data
-    let mut chunks: HashMap<String, ChunkData> = HashMap::new();
+    let mut inner = move || -> Result<()> {
+      let files = backend.list_files()?;
 
-    let total: i32 = files.len() as i32;
-    let mut i: i32 = 0;
+      // Filepath to chunk data
+      let mut chunks: HashMap<String, ChunkData> = HashMap::new();
 
-    let mut buf = [0u8; 1024 * 16];
+      let total: i32 = files.len() as i32;
+      let mut i: i32 = 0;
 
-    for version_file in files {
-      let mut reader = backend.reader(&version_file, 0, 0).unwrap();
+      let mut buf = [0u8; 1024 * 16];
 
-      let mut chunk_data = ChunkData {
-        permissions: version_file.permission,
-        ids: Vec::new(),
-        checksums: Vec::new(),
-        lengths: Vec::new(),
-      };
+      for version_file in files {
+        let mut reader = backend.reader(&version_file, 0, 0)?;
 
-      let mut chunk_index = 0;
-      loop {
-        let mut length = 0;
-        let mut buffer: Vec<u8> = Vec::new();
-        let mut file_empty = false;
+        let mut chunk_data = ChunkData {
+          permissions: version_file.permission,
+          ids: Vec::new(),
+          checksums: Vec::new(),
+          lengths: Vec::new(),
+        };
 
+        let mut chunk_index = 0;
         loop {
-          let read = reader.read(&mut buf).unwrap();
+          let mut length = 0;
+          let mut buffer: Vec<u8> = Vec::new();
+          let mut file_empty = false;
 
-          length += read;
+          loop {
+            let read = reader.read(&mut buf)?;
 
-          // If we're out of data, add this chunk and then move onto the next file
-          if read == 0 {
-            file_empty = true;
-            break;
+            length += read;
+
+            // If we're out of data, add this chunk and then move onto the next file
+            if read == 0 {
+              file_empty = true;
+              break;
+            }
+
+            buffer.extend_from_slice(&buf[0..read]);
+
+            if length >= CHUNK_SIZE {
+              break;
+            }
           }
 
-          buffer.extend_from_slice(&buf[0..read]);
+          let chunk_id = Uuid::new_v4();
+          let checksum = md5::compute(buffer).0;
+          let checksum_string = hex::encode(checksum);
 
-          if length >= CHUNK_SIZE {
+          chunk_data.ids.push(chunk_id.to_string());
+          chunk_data.checksums.push(checksum_string);
+          chunk_data.lengths.push(length);
+
+          let log_str = format!(
+            "Processed chunk {} for {}",
+            chunk_index, &version_file.relative_filename
+          );
+
+          log_sfn.call(Ok(log_str), ThreadsafeFunctionCallMode::Blocking);
+
+          chunk_index += 1;
+
+          if file_empty {
             break;
           }
         }
 
-        let chunk_id = Uuid::new_v4();
-        let checksum = md5::compute(buffer).0;
-        let checksum_string = hex::encode(checksum);
+        chunks.insert(version_file.relative_filename, chunk_data);
 
-        chunk_data.ids.push(chunk_id.to_string());
-        chunk_data.checksums.push(checksum_string);
-        chunk_data.lengths.push(length);
-
-        let log_str = format!(
-          "Processed chunk {} for {}",
-          chunk_index, &version_file.relative_filename
-        );
-
-        log_sfn.call(Ok(log_str), ThreadsafeFunctionCallMode::Blocking);
-
-        chunk_index += 1;
-
-        if file_empty {
-          break;
-        }
+        i += 1;
+        let progress = i * 100 / total;
+        progress_sfn.call(Ok(progress), ThreadsafeFunctionCallMode::Blocking);
       }
 
-      chunks.insert(version_file.relative_filename, chunk_data);
+      callback_borrow.call(
+        Ok(json!(chunks).to_string()),
+        ThreadsafeFunctionCallMode::Blocking,
+      );
 
-      i += 1;
-      let progress = i * 100 / total;
-      progress_sfn.call(Ok(progress), ThreadsafeFunctionCallMode::Blocking);
+      Ok(())
+    };
+
+    let result = inner();
+    if let Err(generate_err) = result {
+      callback_borrow.call(Err(generate_err), ThreadsafeFunctionCallMode::Blocking);
     }
-
-    callback_sfn.call(
-      Ok(json!(chunks).to_string()),
-      ThreadsafeFunctionCallMode::Blocking,
-    );
   });
 
   Ok(())
diff --git a/src/ssl.rs b/src/ssl.rs
index e1e4294..206b7e3 100644
--- a/src/ssl.rs
+++ b/src/ssl.rs
@@ -1,3 +1,4 @@
+use anyhow::anyhow;
 use napi::Error;
 use rcgen::{
   CertificateParams, DistinguishedName, IsCa, KeyPair, KeyUsagePurpose, PublicKeyData,
@@ -10,7 +11,7 @@ use x509_parser::parse_x509_certificate;
 use x509_parser::pem::Pem;
 
 #[napi]
-pub fn generate_root_ca() -> Result<Vec<String>, Error> {
+pub fn generate_root_ca() -> anyhow::Result<Vec<String>> {
   let mut params = CertificateParams::default();
 
   let mut name = DistinguishedName::new();
@@ -22,7 +23,7 @@ pub fn generate_root_ca() -> Result<Vec<String>, Error> {
   params.not_before = OffsetDateTime::now_utc();
   params.not_after = OffsetDateTime::now_utc()
     .checked_add(Duration::days(365 * 1000))
-    .unwrap();
+    .ok_or(anyhow!("failed to calculate end date"))?;
 
   params.is_ca = IsCa::Ca(rcgen::BasicConstraints::Unconstrained);
 
@@ -32,9 +33,8 @@ pub fn generate_root_ca() -> Result<Vec<String>, Error> {
     KeyUsagePurpose::DigitalSignature,
   ];
 
-  let key_pair = KeyPair::generate().map_err(|e| napi::Error::from_reason(e.to_string()))?;
-  let certificate = CertificateParams::self_signed(params, &key_pair)
-    .map_err(|e| napi::Error::from_reason(e.to_string()))?;
+  let key_pair = KeyPair::generate()?;
+  let certificate = CertificateParams::self_signed(params, &key_pair)?;
 
   // Returns certificate, then private key
   Ok(vec![certificate.pem(), key_pair.serialize_pem()])
@@ -46,13 +46,10 @@ pub fn generate_client_certificate(
   _client_name: String,
   root_ca: String,
   root_ca_private: String,
-) -> Result<Vec<String>, Error> {
-  let root_key_pair =
-    KeyPair::from_pem(&root_ca_private).map_err(|e| napi::Error::from_reason(e.to_string()))?;
-  let certificate_params = CertificateParams::from_ca_cert_pem(&root_ca)
-    .map_err(|e| napi::Error::from_reason(e.to_string()))?;
-  let root_ca = CertificateParams::self_signed(certificate_params, &root_key_pair)
-    .map_err(|e| napi::Error::from_reason(e.to_string()))?;
+) -> anyhow::Result<Vec<String>> {
+  let root_key_pair = KeyPair::from_pem(&root_ca_private)?;
+  let certificate_params = CertificateParams::from_ca_cert_pem(&root_ca)?;
+  let root_ca = CertificateParams::self_signed(certificate_params, &root_key_pair)?;
 
   let mut params = CertificateParams::default();
 
@@ -66,28 +63,24 @@ pub fn generate_client_certificate(
     KeyUsagePurpose::DataEncipherment,
   ];
 
-  let key_pair = KeyPair::generate_for(&rcgen::PKCS_ECDSA_P384_SHA384)
-    .map_err(|e| napi::Error::from_reason(e.to_string()))?;
-  let certificate = CertificateParams::signed_by(params, &key_pair, &root_ca, &root_key_pair)
-    .map_err(|e| napi::Error::from_reason(e.to_string()))?;
+  let key_pair = KeyPair::generate_for(&rcgen::PKCS_ECDSA_P384_SHA384)?;
+  let certificate = CertificateParams::signed_by(params, &key_pair, &root_ca, &root_key_pair)?;
 
   // Returns certificate, then private key
   Ok(vec![certificate.pem(), key_pair.serialize_pem()])
 }
 
 #[napi]
-pub fn verify_client_certificate(client_cert: String, root_ca: String) -> Result<bool, Error> {
+pub fn verify_client_certificate(client_cert: String, root_ca: String) -> anyhow::Result<bool> {
   let root_ca = Pem::iter_from_buffer(root_ca.as_bytes())
     .next()
-    .unwrap()
-    .unwrap();
-  let root_ca = root_ca.parse_x509().unwrap();
+    .ok_or(anyhow!("no certificates in root ca"))??;
+  let root_ca = root_ca.parse_x509()?;
 
   let client_cert = Pem::iter_from_buffer(client_cert.as_bytes())
     .next()
-    .unwrap()
-    .unwrap();
-  let client_cert = client_cert.parse_x509().unwrap();
+    .ok_or(anyhow!("No client certs in chain."))??;
+  let client_cert = client_cert.parse_x509()?;
 
   let valid = root_ca
     .verify_signature(Some(client_cert.public_key()))
@@ -97,31 +90,33 @@ pub fn verify_client_certificate(client_cert: String, root_ca: String) -> Result
 }
 
 #[napi]
-pub fn sign_nonce(private_key: String, nonce: String) -> Result<String, Error> {
+pub fn sign_nonce(private_key: String, nonce: String) -> anyhow::Result<String> {
   let rng = SystemRandom::new();
 
-  let key_pair = KeyPair::from_pem(&private_key).unwrap();
+  let key_pair = KeyPair::from_pem(&private_key)?;
 
   let key_pair = EcdsaKeyPair::from_pkcs8(
     &ring::signature::ECDSA_P384_SHA384_FIXED_SIGNING,
     &key_pair.serialize_der(),
     &rng,
   )
-  .unwrap();
+  .map_err(|e| napi::Error::from_reason(e.to_string()))?;
 
-  let signature = key_pair.sign(&rng, nonce.as_bytes()).unwrap();
+  let signature = key_pair
+    .sign(&rng, nonce.as_bytes())
+    .map_err(|e| napi::Error::from_reason(e.to_string()))?;
   let hex_signature = hex::encode(signature);
 
   Ok(hex_signature)
 }
 
 #[napi]
-pub fn verify_nonce(public_cert: String, nonce: String, signature: String) -> Result<bool, Error> {
-  let (_, pem) = x509_parser::pem::parse_x509_pem(public_cert.as_bytes()).unwrap();
-  let (_, spki) = parse_x509_certificate(&pem.contents).unwrap();
-  let public_key = SubjectPublicKeyInfo::from_der(spki.public_key().raw).unwrap();
+pub fn verify_nonce(public_cert: String, nonce: String, signature: String) -> anyhow::Result<bool> {
+  let (_, pem) = x509_parser::pem::parse_x509_pem(public_cert.as_bytes())?;
+  let (_, spki) = parse_x509_certificate(&pem.contents)?;
+  let public_key = SubjectPublicKeyInfo::from_der(spki.public_key().raw)?;
 
-  let raw_signature = hex::decode(signature).unwrap();
+  let raw_signature = hex::decode(signature)?;
 
   let valid = ring::signature::ECDSA_P384_SHA384_FIXED
     .verify(
diff --git a/src/version/backends.rs b/src/version/backends.rs
index e921ca3..6c5f8c0 100644
--- a/src/version/backends.rs
+++ b/src/version/backends.rs
@@ -7,26 +7,29 @@ use std::{
   sync::Arc,
 };
 
+use anyhow::anyhow;
 use flate2::read::DeflateDecoder;
 use rawzip::{
-  CompressionMethod, FileReader, ZipArchive, ZipArchiveEntryWayfinder, ZipEntry,
-  ZipVerifier, RECOMMENDED_BUFFER_SIZE,
+  CompressionMethod, FileReader, ZipArchive, ZipArchiveEntryWayfinder, ZipEntry, ZipVerifier,
+  RECOMMENDED_BUFFER_SIZE,
 };
 
 use crate::version::types::{MinimumFileObject, VersionBackend, VersionFile};
 
-pub fn _list_files(vec: &mut Vec<PathBuf>, path: &Path) {
-  if metadata(path).unwrap().is_dir() {
-    let paths = fs::read_dir(path).unwrap();
+pub fn _list_files(vec: &mut Vec<PathBuf>, path: &Path) -> napi::Result<()> {
+  if metadata(path)?.is_dir() {
+    let paths = fs::read_dir(path)?;
     for path_result in paths {
-      let full_path = path_result.unwrap().path();
-      if metadata(&full_path).unwrap().is_dir() {
-        _list_files(vec, &full_path);
+      let full_path = path_result?.path();
+      if metadata(&full_path)?.is_dir() {
+        _list_files(vec, &full_path)?;
       } else {
         vec.push(full_path);
       }
     }
-  }
+  };
+
+  Ok(())
 }
 
 #[derive(Clone)]
@@ -34,23 +37,26 @@ pub struct PathVersionBackend {
   pub base_dir: PathBuf,
 }
 impl VersionBackend for PathVersionBackend {
-  fn list_files(&mut self) -> Vec<VersionFile> {
+  fn list_files(&mut self) -> anyhow::Result<Vec<VersionFile>> {
     let mut vec = Vec::new();
-    _list_files(&mut vec, &self.base_dir);
+    _list_files(&mut vec, &self.base_dir)?;
 
     let mut results = Vec::new();
 
     for pathbuf in vec.iter() {
-      let relative = pathbuf.strip_prefix(self.base_dir.clone()).unwrap();
+      let relative = pathbuf.strip_prefix(self.base_dir.clone())?;
 
       results.push(
-        self
-          .peek_file(relative.to_str().unwrap().to_owned())
-          .unwrap(),
+        self.peek_file(
+          relative
+            .to_str()
+            .ok_or(napi::Error::from_reason("Could not parse path"))?
+            .to_owned(),
+        )?,
       );
     }
 
-    results
+    Ok(results)
   }
 
   fn reader(
@@ -58,28 +64,28 @@ impl VersionBackend for PathVersionBackend {
     file: &VersionFile,
     start: u64,
     end: u64,
-  ) -> Option<Box<dyn MinimumFileObject + 'static>> {
-    let mut file = File::open(self.base_dir.join(file.relative_filename.clone())).ok()?;
+  ) -> anyhow::Result<Box<dyn MinimumFileObject + 'static>> {
+    let mut file = File::open(self.base_dir.join(file.relative_filename.clone()))?;
 
     if start != 0 {
-      file.seek(SeekFrom::Start(start)).ok()?;
+      file.seek(SeekFrom::Start(start))?;
     }
 
     if end != 0 {
-      return Some(Box::new(file.take(end - start)));
+      return Ok(Box::new(file.take(end - start)));
     }
 
-    return Some(Box::new(file));
+    Ok(Box::new(file))
   }
 
-  fn peek_file(&mut self, sub_path: String) -> Option<VersionFile> {
+  fn peek_file(&mut self, sub_path: String) -> anyhow::Result<VersionFile> {
     let pathbuf = self.base_dir.join(sub_path.clone());
     if !pathbuf.exists() {
-      return None;
+      return Err(anyhow!("Path doesn't exist."));
     };
 
-    let file = File::open(pathbuf.clone()).unwrap();
-    let metadata = file.try_clone().unwrap().metadata().unwrap();
+    let file = File::open(pathbuf.clone())?;
+    let metadata = file.try_clone()?.metadata()?;
     let permission_object = metadata.permissions();
     let permissions = {
       let perm: u32;
@@ -94,7 +100,7 @@ impl VersionBackend for PathVersionBackend {
       perm
     };
 
-    Some(VersionFile {
+    Ok(VersionFile {
       relative_filename: sub_path,
       permission: permissions,
       size: metadata.len(),
@@ -107,11 +113,11 @@ pub struct ZipVersionBackend {
   archive: Arc<ZipArchive<FileReader>>,
 }
 impl ZipVersionBackend {
-  pub fn new(archive: File) -> Self {
-    let archive = ZipArchive::from_file(archive, &mut [0u8; RECOMMENDED_BUFFER_SIZE]).unwrap();
-    Self {
+  pub fn new(archive: File) -> anyhow::Result<Self> {
+    let archive = ZipArchive::from_file(archive, &mut [0u8; RECOMMENDED_BUFFER_SIZE])?;
+    Ok(Self {
       archive: Arc::new(archive),
-    }
+    })
   }
 
   pub fn new_entry<'archive>(
@@ -120,27 +126,26 @@ impl ZipVersionBackend {
     compression_method: CompressionMethod,
     start: u64,
     end: u64,
-  ) -> ZipFileWrapper<'archive> {
+  ) -> anyhow::Result<ZipFileWrapper<'archive>> {
     let deflater: Box<dyn Read + Send + 'archive> = match compression_method {
       CompressionMethod::Store => Box::new(entry.reader()),
       CompressionMethod::Deflate => Box::new(DeflateDecoder::new(entry.reader())),
       CompressionMethod::Deflate64 => Box::new(DeflateDecoder::new(entry.reader())),
-      _ => panic!(
-        "unsupported decompression algorithm: {:?}",
-        compression_method
-      ),
+      _ => Err(anyhow!(
+        "unsupported decompression algorithm: {compression_method:?}"
+      ))?,
     };
 
     let mut verifier = entry.verifying_reader(deflater);
     if start != 0 {
-      io::copy(&mut (&mut verifier).take(start), &mut Sink::default()).unwrap();
+      io::copy(&mut (&mut verifier).take(start), &mut Sink::default())?;
     }
 
-    ZipFileWrapper {
+    Ok(ZipFileWrapper {
       reader: verifier,
       limit: (end - start) as usize,
       current: 0,
-    }
+    })
   }
 }
 
@@ -159,10 +164,8 @@ impl<'a> Read for ZipFileWrapper<'a> {
     let has_limit = self.limit != 0;
 
     // End this stream if the read is the right size
-    if has_limit {
-      if self.current >= self.limit {
-        return Ok(0);
-      }
+    if has_limit && self.current >= self.limit {
+      return Ok(0);
     }
 
     let read = self.reader.read(buf)?;
@@ -173,7 +176,7 @@ impl<'a> Read for ZipFileWrapper<'a> {
         return Ok(read - over);
       }
     }
-    return Ok(read);
+    Ok(read)
   }
 }
 //impl<'a> MinimumFileObject for ZipFileWrapper<'a> {}
@@ -182,40 +185,40 @@ impl ZipVersionBackend {
   fn find_wayfinder(
     &mut self,
     filename: &str,
-  ) -> Option<(ZipArchiveEntryWayfinder, CompressionMethod)> {
+  ) -> anyhow::Result<(ZipArchiveEntryWayfinder, CompressionMethod)> {
     let read_buffer = &mut [0u8; RECOMMENDED_BUFFER_SIZE];
     let mut entries = self.archive.entries(read_buffer);
     let entry = loop {
-      if let Some(v) = entries.next_entry().unwrap() {
-        if v.file_path().try_normalize().unwrap().as_ref() == filename {
-          break Some(v);
+      if let Some(v) = entries.next_entry()? {
+        if v.file_path().try_normalize()?.as_ref() == filename {
+          break Ok(v);
         }
       } else {
-        break None;
+        break Err(anyhow!("failed to fetch zip file header."));
       }
     }?;
 
     let wayfinder = entry.wayfinder();
 
-    Some((wayfinder, entry.compression_method()))
+    Ok((wayfinder, entry.compression_method()))
   }
 }
 impl VersionBackend for ZipVersionBackend {
-  fn list_files(&mut self) -> Vec<VersionFile> {
+  fn list_files(&mut self) -> anyhow::Result<Vec<VersionFile>> {
     let mut results = Vec::new();
     let read_buffer = &mut [0u8; RECOMMENDED_BUFFER_SIZE];
     let mut budget_iterator = self.archive.entries(read_buffer);
-    while let Some(entry) = budget_iterator.next_entry().unwrap() {
+    while let Some(entry) = budget_iterator.next_entry()? {
       if entry.is_dir() {
         continue;
       }
       results.push(VersionFile {
-        relative_filename: String::from(entry.file_path().try_normalize().unwrap()),
+        relative_filename: String::from(entry.file_path().try_normalize()?),
         permission: entry.mode().permissions(),
         size: entry.uncompressed_size_hint(),
       });
     }
-    results
+    Ok(results)
   }
 
   fn reader(
@@ -223,19 +226,21 @@ impl VersionBackend for ZipVersionBackend {
     file: &VersionFile,
     start: u64,
     end: u64,
-  ) -> Option<Box<dyn MinimumFileObject + '_>> {
+  ) -> anyhow::Result<Box<dyn MinimumFileObject + '_>> {
     let (wayfinder, compression_method) = self.find_wayfinder(&file.relative_filename)?;
-    let local_entry = self.archive.get_entry(wayfinder).unwrap();
+    let local_entry = self
+      .archive
+      .get_entry(wayfinder)?;
 
-    let wrapper = self.new_entry(local_entry, compression_method, start, end);
+    let wrapper = self.new_entry(local_entry, compression_method, start, end)?;
 
-    Some(Box::new(wrapper) as Box<dyn MinimumFileObject>)
+    Ok(Box::new(wrapper) as Box<dyn MinimumFileObject>)
   }
 
-  fn peek_file(&mut self, sub_path: String) -> Option<VersionFile> {
+  fn peek_file(&mut self, sub_path: String) -> anyhow::Result<VersionFile> {
     let (entry, _) = self.find_wayfinder(&sub_path)?;
 
-    Some(VersionFile {
+    Ok(VersionFile {
       relative_filename: sub_path,
       permission: 0,
       size: entry.uncompressed_size_hint(),
diff --git a/src/version/types.rs b/src/version/types.rs
index 37fe899..d6d5cf3 100644
--- a/src/version/types.rs
+++ b/src/version/types.rs
@@ -1,6 +1,4 @@
-use std::{
-  fmt::Debug, io::Read
-};
+use std::{fmt::Debug, io::Read};
 
 use dyn_clone::DynClone;
 use tokio::io::{self, AsyncRead};
@@ -12,7 +10,7 @@ pub struct VersionFile {
   pub size: u64,
 }
 
-pub trait MinimumFileObject: Read + Send  {}
+pub trait MinimumFileObject: Read + Send {}
 impl<T: Read + Send> MinimumFileObject for T {}
 
 // Intentionally not a generic, because of types in read_file
@@ -30,16 +28,27 @@ impl<'a> AsyncRead for ReadToAsyncRead<'a> {
   ) -> std::task::Poll<io::Result<()>> {
     let mut read_buf = [0u8; ASYNC_READ_BUFFER_SIZE];
     let read_size = ASYNC_READ_BUFFER_SIZE.min(buf.remaining());
-    let read = self.inner.read(&mut read_buf[0..read_size]).unwrap();
-    buf.put_slice(&read_buf[0..read]);
-    std::task::Poll::Ready(Ok(()))
+    match self.inner.read(&mut read_buf[0..read_size]) {
+      Ok(read) => {
+        buf.put_slice(&read_buf[0..read]);
+        std::task::Poll::Ready(Ok(()))
+      }
+      Err(err) => {
+        std::task::Poll::Ready(Err(err))
+      },
+    }
   }
 }
 
 pub trait VersionBackend: DynClone {
-  fn list_files(&mut self) -> Vec<VersionFile>;
-  fn peek_file(&mut self, sub_path: String) -> Option<VersionFile>;
-  fn reader(&mut self, file: &VersionFile, start: u64, end: u64) -> Option<Box<dyn MinimumFileObject + '_>>;
+  fn list_files(&mut self) -> anyhow::Result<Vec<VersionFile>>;
+  fn peek_file(&mut self, sub_path: String) -> anyhow::Result<VersionFile>;
+  fn reader(
+    &mut self,
+    file: &VersionFile,
+    start: u64,
+    end: u64,
+  ) -> anyhow::Result<Box<dyn MinimumFileObject + '_>>;
 }
 
-dyn_clone::clone_trait_object!(VersionBackend);
\ No newline at end of file
+dyn_clone::clone_trait_object!(VersionBackend);
diff --git a/src/version/utils.rs b/src/version/utils.rs
index 36d5b72..3bd8cf5 100644
--- a/src/version/utils.rs
+++ b/src/version/utils.rs
@@ -1,7 +1,6 @@
-use std::{
-  collections::HashMap, fs::File, path::Path
-};
+use std::{collections::HashMap, fs::File, path::Path};
 
+use anyhow::anyhow;
 use napi::{bindgen_prelude::*, sys::napi_value__, tokio_stream::StreamExt};
 use tokio_util::codec::{BytesCodec, FramedRead};
 
@@ -15,7 +14,7 @@ use crate::version::{
  */
 pub fn create_backend_constructor<'a>(
   path: &Path,
-) -> Option<Box<dyn FnOnce() -> Box<dyn VersionBackend + Send + 'a>>> {
+) -> Option<Box<dyn FnOnce() -> Result<Box<dyn VersionBackend + Send + 'a>>>> {
   if !path.exists() {
     return None;
   }
@@ -23,12 +22,14 @@ pub fn create_backend_constructor<'a>(
   let is_directory = path.is_dir();
   if is_directory {
     let base_dir = path.to_path_buf();
-    return Some(Box::new(move || Box::new(PathVersionBackend { base_dir })));
+    return Some(Box::new(move || {
+      Ok(Box::new(PathVersionBackend { base_dir }))
+    }));
   };
 
   if path.to_string_lossy().ends_with(".zip") {
-    let f = File::open(path.to_path_buf()).unwrap();
-    return Some(Box::new(|| Box::new(ZipVersionBackend::new(f))));
+    let f = File::open(path.to_path_buf()).ok()?;
+    return Some(Box::new(|| Ok(Box::new(ZipVersionBackend::new(f)?))));
   }
 
   None
@@ -58,10 +59,13 @@ impl<'a> DropletHandler<'a> {
     let fs_path = Path::new(&path);
     let constructor = create_backend_constructor(fs_path)?;
 
-    let existing_backend = self.backend_cache.entry(path).or_insert_with(|| {
-      let backend = constructor();
-      backend
-    });
+    let existing_backend = match self.backend_cache.entry(path) {
+      std::collections::hash_map::Entry::Occupied(occupied_entry) => occupied_entry.into_mut(),
+      std::collections::hash_map::Entry::Vacant(vacant_entry) => {
+        let backend = constructor().ok()?;
+        vacant_entry.insert(backend)
+      }
+    };
 
     Some(existing_backend)
   }
@@ -80,7 +84,7 @@ impl<'a> DropletHandler<'a> {
     let backend = self
       .create_backend_for_path(path)
       .ok_or(napi::Error::from_reason("No backend for path"))?;
-    let files = backend.list_files();
+    let files = backend.list_files()?;
     Ok(files.into_iter().map(|e| e.relative_filename).collect())
   }
 
@@ -90,11 +94,9 @@ impl<'a> DropletHandler<'a> {
       .create_backend_for_path(path)
       .ok_or(napi::Error::from_reason("No backend for path"))?;
 
-    let file = backend
-      .peek_file(sub_path)
-      .ok_or(napi::Error::from_reason("Can't find file to peek"))?;
+    let file = backend.peek_file(sub_path)?;
 
-    return Ok(file.size.try_into().unwrap());
+    Ok(file.size)
   }
 
   #[napi]
@@ -106,28 +108,24 @@ impl<'a> DropletHandler<'a> {
     env: Env,
     start: Option<BigInt>,
     end: Option<BigInt>,
-  ) -> Result<JsDropStreamable> {
+  ) -> anyhow::Result<JsDropStreamable> {
     let stream = reference.share_with(env, |handler| {
       let backend = handler
         .create_backend_for_path(path)
-        .ok_or(napi::Error::from_reason("Failed to create backend."))?;
+        .ok_or(anyhow!("Failed to create backend."))?;
       let version_file = VersionFile {
         relative_filename: sub_path,
         permission: 0, // Shouldn't matter
         size: 0,       // Shouldn't matter
       };
       // Use `?` operator for cleaner error propagation from `Option`
-      let reader = backend
-        .reader(
-          &version_file,
-          start.map(|e| e.get_u64().1).unwrap_or(0),
-          end.map(|e| e.get_u64().1).unwrap_or(0),
-        )
-        .ok_or(napi::Error::from_reason("Failed to create reader."))?;
+      let reader = backend.reader(
+        &version_file,
+        start.map(|e| e.get_u64().1).unwrap_or(0),
+        end.map(|e| e.get_u64().1).unwrap_or(0),
+      )?;
 
-      let async_reader = ReadToAsyncRead {
-        inner: reader,
-      };
+      let async_reader = ReadToAsyncRead { inner: reader };
 
       // Create a FramedRead stream with BytesCodec for chunking
       let stream = FramedRead::new(async_reader, BytesCodec::new())
@@ -137,12 +135,12 @@ impl<'a> DropletHandler<'a> {
             // Apply Result::map to transform Ok(BytesMut) to Ok(Vec<u8>)
             .map(|bytes| bytes.to_vec())
             // Apply Result::map_err to transform Err(std::io::Error) to Err(napi::Error)
-            .map_err(|e| napi::Error::from(e)) // napi::Error implements From<tokio::io::Error>
+            .map_err(napi::Error::from) // napi::Error implements From<tokio::io::Error>
         });
       // Create the napi-rs ReadableStream from the tokio_stream::Stream
       // The unwrap() here means if stream creation fails, it will panic.
       // For a production system, consider returning Result<Option<...>> and handling this.
-      Ok(ReadableStream::create_with_stream_bytes(&env, stream).unwrap())
+      ReadableStream::create_with_stream_bytes(&env, stream)
     })?;
 
     Ok(JsDropStreamable { inner: stream })