diff --git a/crates/matrix-sdk-crypto-js/Cargo.toml b/crates/matrix-sdk-crypto-js/Cargo.toml
index 7efccb75b..6080b04ca 100644
--- a/crates/matrix-sdk-crypto-js/Cargo.toml
+++ b/crates/matrix-sdk-crypto-js/Cargo.toml
@@ -22,21 +22,20 @@ wasm-opt = ['-Oz']
 crate-type = ["cdylib"]
 
 [features]
-default = ["js"]
+default = []
 qrcode = ["matrix-sdk-crypto/qrcode"]
-backups_v1 = ["matrix-sdk-crypto/backups_v1"]
 docsrs = []
 js = []
-nodejs = []
+nodejs = ["napi", "napi-derive"]
 
 [dependencies]
 matrix-sdk-crypto = { version = "0.5.0", path = "../matrix-sdk-crypto" }
-http = "0.2.6"
-serde_json = "1.0.79"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 ruma = { version = "0.6.2", features = ["client-api-c", "rand", "unstable-msc2676", "unstable-msc2677"] }
 vodozemac = "0.2.0"
+napi = { version = "2.4.3", default-features = false, features = ["napi4"], optional = true }
+napi-derive = { version = "2.4.1", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 ruma = { version = "0.6.2", features = ["client-api-c", "js", "rand", "unstable-msc2676", "unstable-msc2677"] }
@@ -44,4 +43,9 @@ vodozemac = { version = "0.2.0", features = ["js"] }
 wasm-bindgen = "0.2.80"
 wasm-bindgen-futures = "0.4.30"
 js-sys = "0.3.49"
-anyhow = "1.0"
\ No newline at end of file
+serde_json = "1.0.79"
+http = "0.2.6"
+anyhow = "1.0"
+
+[target.'cfg(not(target_arch = "wasm32"))'.build-dependencies]
+napi-build = "2.0.0"
\ No newline at end of file
diff --git a/crates/matrix-sdk-crypto-js/build.rs b/crates/matrix-sdk-crypto-js/build.rs
new file mode 100644
index 000000000..46bfd15de
--- /dev/null
+++ b/crates/matrix-sdk-crypto-js/build.rs
@@ -0,0 +1,7 @@
+#[cfg(feature = "nodejs")]
+fn main() {
+    napi_build::setup();
+}
+
+#[cfg(not(feature = "nodejs"))]
+fn main() {}
diff --git a/crates/matrix-sdk-crypto-js/nodejs/Makefile b/crates/matrix-sdk-crypto-js/nodejs/Makefile
new file mode 100644
index 000000000..2bdfdad2c
--- /dev/null
+++ b/crates/matrix-sdk-crypto-js/nodejs/Makefile
@@ -0,0 +1,5 @@
+build:
+	cd .. && napi build --platform --release --features nodejs
+
+test:
+	echo 'nop'
diff --git a/crates/matrix-sdk-crypto-js/package.json b/crates/matrix-sdk-crypto-js/package.json
new file mode 100644
index 000000000..be38b651c
--- /dev/null
+++ b/crates/matrix-sdk-crypto-js/package.json
@@ -0,0 +1,27 @@
+{
+  "name": "matrix-sdk-crypto",
+  "version": "0.5.0",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "napi": {
+    "name": "matrix-sdk-crypto",
+    "triples": {
+      "additional": [
+        "aarch64-apple-darwin"
+      ]
+    }
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "@napi-rs/cli": "^2.9.0",
+    "ava": "^4.2.0"
+  },
+  "engines": {
+    "node": ">= 10"
+  },
+  "scripts": {
+    "artifacts": "napi artifacts",
+    "build": "napi build --platform --release",
+    "test": "ava"
+  }
+}
diff --git a/crates/matrix-sdk-crypto-js/src/errors.rs b/crates/matrix-sdk-crypto-js/src/errors.rs
new file mode 100644
index 000000000..cec0d369a
--- /dev/null
+++ b/crates/matrix-sdk-crypto-js/src/errors.rs
@@ -0,0 +1,16 @@
+#[cfg(feature = "js")]
+pub type Error = wasm_bindgen::JsError;
+
+#[cfg(feature = "nodejs")]
+#[derive(Debug)]
+pub struct Error(napi::Error);
+
+#[cfg(feature = "nodejs")]
+impl<E> From<E> for Error
+where
+    E: std::error::Error,
+{
+    fn from(error: E) -> Self {
+        Self(napi::Error::from_reason(error.to_string()))
+    }
+}
diff --git a/crates/matrix-sdk-crypto-js/src/lib.rs b/crates/matrix-sdk-crypto-js/src/lib.rs
index acc9d95bc..765a32557 100644
--- a/crates/matrix-sdk-crypto-js/src/lib.rs
+++ b/crates/matrix-sdk-crypto-js/src/lib.rs
@@ -15,11 +15,19 @@
 #![doc = include_str!("../README.md")]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![warn(missing_docs, missing_debug_implementations)]
+
+#[cfg(all(not(feature = "js"), not(feature = "nodejs")))]
+compile_error!("One of the following features must be enabled: `js` or `nodejs`");
+
+#[cfg(all(feature = "js", feature = "nodejs"))]
+compile_error!("The `js` and `nodejs` features are mutually exclusive.");
+
 #[cfg(all(feature = "js", not(target_arch = "wasm32")))]
 compile_error!(
     "The `js` feature must be enabled only for the `wasm32` target (either `wasm32-unknown-unknown` or `wasm32-wasi`)."
 );
 
+//mod errors;
 pub mod events;
 mod future;
 pub mod identifiers;
@@ -36,6 +44,7 @@ use wasm_bindgen::{convert::RefFromWasmAbi, prelude::*};
 /// https://github.com/rustwasm/wasm-bindgen/issues/2231#issuecomment-656293288.
 ///
 /// The returned value is a likely to be `wasm_bindgen::__ref::Ref<T>`.
+#[cfg(feature = "js")]
 fn downcast<T>(value: &JsValue, classname: &str) -> Result<T::Anchor, JsError>
 where
     T: RefFromWasmAbi<Abi = u32>,