diff --git a/.editorconfig b/.editorconfig
index b01b0fa..1cf8dfb 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -3,8 +3,7 @@
 # Top-most EditorConfig file
 root = true
 
-# Python files
-[*.py]
+[*.{rs,py}]
 indent_style = space
 indent_size = 4
 end_of_line = lf
@@ -12,7 +11,7 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[*.{rs,js}]
+[*.js]
 indent_style = space
 indent_size = 2
 end_of_line = lf
diff --git a/ainu-utils-js/Cargo.toml b/ainu-utils-js/Cargo.toml
index d7ff8ac..4aaf8d0 100644
--- a/ainu-utils-js/Cargo.toml
+++ b/ainu-utils-js/Cargo.toml
@@ -13,3 +13,5 @@ crate-type = ["cdylib", "rlib"]
 ainu-utils = { path = "../ainu-utils" }
 wasm-bindgen = "0.2.114"
 js-sys = "0.3"
+serde = { version = "1.0.228", features = ["derive"] }
+serde-wasm-bindgen = "0.6.5"
diff --git a/ainu-utils-js/src/lib.rs b/ainu-utils-js/src/lib.rs
index 18cdae5..bff1c7b 100644
--- a/ainu-utils-js/src/lib.rs
+++ b/ainu-utils-js/src/lib.rs
@@ -1,19 +1,38 @@
-use ainu_utils::{kana, numbers, syllables, tokenizer};
-use js_sys::Reflect;
+use ainu_utils::{
+    kana, numbers, syllables,
+    tokens::{self, TokenizeOptions},
+};
+use serde::Deserialize;
 use wasm_bindgen::prelude::*;
 
+#[derive(Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct TokenizeOptionsJs {
+    keep_whitespace: Option<bool>,
+}
+
+impl From<TokenizeOptionsJs> for TokenizeOptions {
+    fn from(value: TokenizeOptionsJs) -> Self {
+        let defaults = TokenizeOptions::default();
+        Self {
+            keep_whitespace: value.keep_whitespace.unwrap_or(defaults.keep_whitespace),
+        }
+    }
+}
+
 #[wasm_bindgen]
-pub fn tokenize(text: &str, options: JsValue) -> Vec<String> {
-    let keep_whitespace = Reflect::get(&options, &JsValue::from_str("keepWhitespace"))
-        .ok()
-        .and_then(|v| v.as_bool())
-        .unwrap_or(false);
-    tokenizer::tokenize(text, keep_whitespace)
+pub fn tokenize(text: &str, options: Option<JsValue>) -> Result<Vec<String>, JsError> {
+    let tokenize_options: TokenizeOptions = options
+        .map(serde_wasm_bindgen::from_value::<TokenizeOptionsJs>)
+        .transpose()?
+        .map(Into::into)
+        .unwrap_or_default();
+    Ok(tokens::tokenize(text, &tokenize_options))
 }
 
 #[wasm_bindgen]
 pub fn syllabicate(text: &str) -> Vec<String> {
-    syllables::parse(text)
+    syllables::syllabicate(text)
 }
 
 #[wasm_bindgen(js_name = transliterateToKana)]
diff --git a/ainu-utils-js/tests/index.spec.js b/ainu-utils-js/tests/index.spec.js
index 5b934ff..8d65ad0 100644
--- a/ainu-utils-js/tests/index.spec.js
+++ b/ainu-utils-js/tests/index.spec.js
@@ -1,11 +1,17 @@
-import { test, expect } from "vitest";
+import { test, expect, describe } from "vitest";
 import { tokenize, transliterateToKana } from "../dist/index.js";
 
-test("tokenize", () => {
-  const tokens = tokenize("irankarapte. e=iwanke ya?", { keepWhitespace: false });
-  expect(tokens).toEqual(["irankarapte", ".", "e=", "iwanke", "ya", "?"]);
-});
+describe("tokenize", () => {
+  test("defaults", () => {
+    const tokens = tokenize("irankarapte. e=iwanke ya?");
+    expect(tokens).toEqual(["irankarapte", ".", "e=", "iwanke", "ya", "?"]);
+  });
 
+  test("keep whitespace", () => {
+    const tokens = tokenize("irankarapte. e=iwanke ya?", { keepWhitespace: true });
+    expect(tokens).toEqual(["irankarapte", ".", " ", "e=", "iwanke", " ", "ya", "?"]);
+  });
+});
 
 test("transliterateToKana", () => {
   const tokens = transliterateToKana("irankarapte. e=iwanke ya?");
diff --git a/ainu-utils-python/src/lib.rs b/ainu-utils-python/src/lib.rs
index ffb6010..e2487a2 100644
--- a/ainu-utils-python/src/lib.rs
+++ b/ainu-utils-python/src/lib.rs
@@ -1,11 +1,16 @@
 extern crate ainu_utils as ainu_utils_rust;
 
+use ainu_utils_rust::tokens::TokenizeOptions;
 use pyo3::prelude::*;
 
 #[pyfunction]
-#[pyo3(signature = (text, *, keep_whitespace = false))]
-fn tokenize(text: &str, keep_whitespace: bool) -> Vec<String> {
-    ainu_utils_rust::tokenizer::tokenize(text, keep_whitespace)
+#[pyo3(signature = (text, *, keep_whitespace = None))]
+fn tokenize(text: &str, keep_whitespace: Option<bool>) -> Vec<String> {
+    let tokenize_options_default = TokenizeOptions::default();
+    let tokenize_options = TokenizeOptions {
+        keep_whitespace: keep_whitespace.unwrap_or(tokenize_options_default.keep_whitespace),
+    };
+    ainu_utils_rust::tokens::tokenize(text, &tokenize_options)
 }
 
 #[pyfunction]
@@ -20,7 +25,7 @@ fn number_to_words(input: i32) -> String {
 
 #[pyfunction]
 fn syllabicate(text: &str) -> Vec<String> {
-    ainu_utils_rust::syllables::parse(text)
+    ainu_utils_rust::syllables::syllabicate(text)
 }
 
 #[pymodule]
diff --git a/ainu-utils-python/tests/test_tokenize.py b/ainu-utils-python/tests/test_tokenize.py
index c5e4828..e94e64e 100644
--- a/ainu-utils-python/tests/test_tokenize.py
+++ b/ainu-utils-python/tests/test_tokenize.py
@@ -2,7 +2,7 @@
 
 
 def test_tokenize():
-    result = ainu_utils.tokenize("irankarapte. e=iwanke ya?", keep_whitespace=False)
+    result = ainu_utils.tokenize("irankarapte. e=iwanke ya?")
     assert result == ["irankarapte", ".", "e=", "iwanke", "ya", "?"]
 
 
diff --git a/ainu-utils/src/lib.rs b/ainu-utils/src/lib.rs
index 48183e6..792b77f 100644
--- a/ainu-utils/src/lib.rs
+++ b/ainu-utils/src/lib.rs
@@ -2,4 +2,4 @@ pub mod kana;
 pub mod numbers;
 pub mod phoneme;
 pub mod syllables;
-pub mod tokenizer;
+pub mod tokens;
diff --git a/ainu-utils/src/syllables/syllables.rs b/ainu-utils/src/syllables/syllables.rs
index 15db401..318a2c2 100644
--- a/ainu-utils/src/syllables/syllables.rs
+++ b/ainu-utils/src/syllables/syllables.rs
@@ -1,6 +1,6 @@
 use crate::phoneme::Phoneme;
 
-pub fn parse(input: &str) -> Vec<String> {
+pub fn syllabicate(input: &str) -> Vec<String> {
     let chars: Vec<char> = input.chars().collect();
 
     let mut syllables = vec![];
diff --git a/ainu-utils/src/syllables/syllables_test.rs b/ainu-utils/src/syllables/syllables_test.rs
index 02bb6a5..8a6f078 100644
--- a/ainu-utils/src/syllables/syllables_test.rs
+++ b/ainu-utils/src/syllables/syllables_test.rs
@@ -1,22 +1,23 @@
-use super::syllables::parse;
+use super::syllables::syllabicate;
 
 #[test]
-fn it_parses() {
-    assert_eq!(parse("pirka"), ["pir", "ka"]);
-    assert_eq!(parse("cikappo"), ["ci", "kap", "po"]);
-    assert_eq!(parse("aep"), ["a", "ep"]);
+fn it_syllabicates() {
+    assert_eq!(syllabicate("pirka"), ["pir", "ka"]);
+    assert_eq!(syllabicate("cikappo"), ["ci", "kap", "po"]);
+    assert_eq!(syllabicate("aep"), ["a", "ep"]);
     assert_eq!(
-        parse("eyaykosiramsuypa"),
+        syllabicate("eyaykosiramsuypa"),
         ["e", "yay", "ko", "si", "ram", "suy", "pa"]
     );
     assert_eq!(
-        parse("eci=koyayrayke p ne na!"),
-        ["e", "ci", "=", "ko", "yay", "ray", "ke", " ", "p", " ", "ne", " ", "na", "!"]
+        syllabicate("eci=koyayrayke p ne na!"),
+        [
+            "e", "ci", "=", "ko", "yay", "ray", "ke", " ", "p", " ", "ne", " ", "na", "!"
+        ]
     )
 }
 
-
 #[test]
 fn it_handles_accent_symbols_as_well() {
-    assert_eq!(parse("káni"), ["ká", "ni"])
-}
\ No newline at end of file
+    assert_eq!(syllabicate("káni"), ["ká", "ni"])
+}
diff --git a/ainu-utils/src/tokenizer/mod.rs b/ainu-utils/src/tokenizer/mod.rs
deleted file mode 100644
index 25a3310..0000000
--- a/ainu-utils/src/tokenizer/mod.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-mod tokenizer;
-mod unfix;
-
-pub use self::tokenizer::*;
-
-#[cfg(test)]
-mod tokenizer_test;
-
-#[cfg(test)]
-mod unfix_test;
diff --git a/ainu-utils/src/tokens/mod.rs b/ainu-utils/src/tokens/mod.rs
new file mode 100644
index 0000000..b99e174
--- /dev/null
+++ b/ainu-utils/src/tokens/mod.rs
@@ -0,0 +1,10 @@
+mod tokenize;
+mod unfix;
+
+pub use self::tokenize::*;
+
+#[cfg(test)]
+mod tokenize_test;
+
+#[cfg(test)]
+mod unfix_test;
diff --git a/ainu-utils/src/tokenizer/tokenizer.rs b/ainu-utils/src/tokens/tokenize.rs
similarity index 75%
rename from ainu-utils/src/tokenizer/tokenizer.rs
rename to ainu-utils/src/tokens/tokenize.rs
index 6fb29a2..f294108 100644
--- a/ainu-utils/src/tokenizer/tokenizer.rs
+++ b/ainu-utils/src/tokens/tokenize.rs
@@ -1,6 +1,11 @@
-use crate::tokenizer::unfix::unfix;
+use super::unfix::unfix;
 
-pub fn tokenize(text: &str, keep_whitespace: bool) -> Vec<String> {
+#[derive(Default)]
+pub struct TokenizeOptions {
+    pub keep_whitespace: bool,
+}
+
+pub fn tokenize(text: &str, options: &TokenizeOptions) -> Vec<String> {
     let mut words = Vec::new();
     let mut word = String::new();
 
@@ -21,7 +26,7 @@ pub fn tokenize(text: &str, keep_whitespace: bool) -> Vec<String> {
                 words.push(c.to_string());
             }
 
-            if c.is_whitespace() && keep_whitespace {
+            if c.is_whitespace() && options.keep_whitespace {
                 words.push(c.to_string());
             }
         }
diff --git a/ainu-utils/src/tokenizer/tokenizer_test.rs b/ainu-utils/src/tokens/tokenize_test.rs
similarity index 78%
rename from ainu-utils/src/tokenizer/tokenizer_test.rs
rename to ainu-utils/src/tokens/tokenize_test.rs
index 08e737e..ead2022 100644
--- a/ainu-utils/src/tokenizer/tokenizer_test.rs
+++ b/ainu-utils/src/tokens/tokenize_test.rs
@@ -1,9 +1,11 @@
-use super::tokenizer::tokenize;
+use crate::tokens::TokenizeOptions;
+
+use super::tokenize::tokenize;
 
 #[test]
 fn test_tokenize() {
     let text = "irankarapte! eyami yak a=ye aeywankep ku=kar wa k=an.";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
 
     assert_eq!(
         tokens,
@@ -28,7 +30,7 @@ fn test_tokenize() {
 #[test]
 fn test_tokenize_suffix() {
     let text = "soyenpa=an wa sinot=an ro!";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
 
     assert_eq!(
         tokens,
@@ -39,7 +41,7 @@ fn test_tokenize_suffix() {
 #[test]
 fn test_sentence_does_not_end_with_period() {
     let text = "a=nukar hike i=yaykohaytare i=yaypokaste wa iki pe";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
 
     assert_eq!(
         tokens,
@@ -61,7 +63,7 @@ fn test_sentence_does_not_end_with_period() {
 #[test]
 fn test_sentence_ending_with_a_fixed_word() {
     let text = "neno a=ye itak pirka a=ye itak i=koynu wa ... i=konu wa i=kore";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
 
     assert_eq!(
         tokens,
@@ -75,7 +77,7 @@ fn test_sentence_ending_with_a_fixed_word() {
 #[test]
 fn test_parse_numbers() {
     let text = "1000 yen ku=kor";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
 
     assert_eq!(tokens, vec!["1000", "yen", "ku=", "kor"]);
 }
@@ -83,14 +85,14 @@ fn test_parse_numbers() {
 #[test]
 fn test_handles_hyphen_within_word() {
     let text = "cep-koyki wa e";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
     assert_eq!(tokens, vec!["cep-koyki", "wa", "e"]);
 }
 
 #[test]
 fn test_handles_double_prefixes() {
     let text = "niwen seta ne kusu a=e=kupa na.";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
     assert_eq!(
         tokens,
         vec!["niwen", "seta", "ne", "kusu", "a=", "e=", "kupa", "na", "."]
@@ -100,11 +102,11 @@ fn test_handles_double_prefixes() {
 #[test]
 fn test_handles_glottal_stop() {
     let text = "ku=kor irwak'utari";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
     assert_eq!(tokens, vec!["ku=", "kor", "irwak'utari"]);
 
     let text = "'ku=kor rusuy!' sekor hawean";
-    let tokens = tokenize(text, false);
+    let tokens = tokenize(text, &Default::default());
     assert_eq!(
         tokens,
         vec!["'", "ku=", "kor", "rusuy", "!", "'", "sekor", "hawean"]
@@ -114,7 +116,10 @@ fn test_handles_glottal_stop() {
 #[test]
 fn test_keep_whitespace() {
     let text = "irankarapte. tanto sirpirka ne.";
-    let tokens = tokenize(text, true);
+    let options = TokenizeOptions {
+        keep_whitespace: true,
+    };
+    let tokens = tokenize(text, &options);
     assert_eq!(
         tokens,
         vec![
diff --git a/ainu-utils/src/tokenizer/unfix.rs b/ainu-utils/src/tokens/unfix.rs
similarity index 100%
rename from ainu-utils/src/tokenizer/unfix.rs
rename to ainu-utils/src/tokens/unfix.rs
diff --git a/ainu-utils/src/tokenizer/unfix_test.rs b/ainu-utils/src/tokens/unfix_test.rs
similarity index 100%
rename from ainu-utils/src/tokenizer/unfix_test.rs
rename to ainu-utils/src/tokens/unfix_test.rs