diff --git a/vidyut-prakriya/src/wasm.rs b/vidyut-prakriya/src/wasm.rs
index 5809b25..f88b75e 100644
--- a/vidyut-prakriya/src/wasm.rs
+++ b/vidyut-prakriya/src/wasm.rs
@@ -152,7 +152,15 @@ struct KrdantaArgs {
 #[derive(Serialize, Deserialize)]
 struct PratipadikaArgs {
     basic: Option<String>,
+    nyap: Option<String>,
     krdanta: Option<KrdantaArgs>,
+    taddhitanta: Option<TaddhitantaArgsInner>,
+}
+
+#[derive(Serialize, Deserialize)]
+struct TaddhitantaArgsInner {
+    stem: String,
+    taddhita: Taddhita,
 }
 
 #[derive(Serialize, Deserialize)]
@@ -173,6 +181,12 @@ struct TinantaArgs {
     pada: Option<DhatuPada>,
 }
 
+#[derive(Serialize, Deserialize)]
+struct TaddhitantaArgs {
+    pratipadika: PratipadikaArgs,
+    taddhita: Taddhita,
+}
+
 /// Shorthand for result type
 pub type Result<T> = std::result::Result<T, Error>;
 
@@ -212,12 +226,31 @@ impl SubantaArgs {
         let pratipadika = match self.pratipadika {
             PratipadikaArgs {
                 basic: Some(basic),
+                nyap: None,
                 krdanta: None,
+                taddhitanta: None,
             } => Pratipadika::basic(Slp1String::from(basic).expect("ok")),
             PratipadikaArgs {
                 basic: None,
+                nyap: Some(nyap),
+                krdanta: None,
+                taddhitanta: None,
+            } => Pratipadika::nyap(Slp1String::from(nyap).expect("ok")),
+            PratipadikaArgs {
+                basic: None,
+                nyap: None,
                 krdanta: Some(krt),
+                taddhitanta: None,
             } => Pratipadika::Krdanta(Box::new(krt.into_rust()?)),
+            PratipadikaArgs {
+                basic: None,
+                nyap: None,
+                krdanta: None,
+                taddhitanta: Some(tad),
+            } => {
+                let base = Pratipadika::basic(Slp1String::from(tad.stem).expect("ok"));
+                Pratipadika::Taddhitanta(Box::new(Taddhitanta::new(base, tad.taddhita)))
+            }
             // TODO: improve error handling, remove placeholder
             _ => Pratipadika::basic(Slp1String::from("doza").expect("ok")),
         };
@@ -245,6 +278,33 @@ impl TinantaArgs {
     }
 }
 
+impl TaddhitantaArgs {
+    fn into_rust(self) -> Result<Taddhitanta> {
+        let pratipadika = match self.pratipadika {
+            PratipadikaArgs {
+                basic: Some(basic),
+                nyap: None,
+                krdanta: None,
+                taddhitanta: None,
+            } => Pratipadika::basic(Slp1String::from(basic).expect("ok")),
+            PratipadikaArgs {
+                basic: None,
+                nyap: Some(nyap),
+                krdanta: None,
+                taddhitanta: None,
+            } => Pratipadika::nyap(Slp1String::from(nyap).expect("ok")),
+            PratipadikaArgs {
+                basic: None,
+                nyap: None,
+                krdanta: Some(krt),
+                taddhitanta: None,
+            } => Pratipadika::Krdanta(Box::new(krt.into_rust()?)),
+            _ => Pratipadika::basic(Slp1String::from("doza").expect("ok")),
+        };
+        Ok(Taddhitanta::new(pratipadika, self.taddhita))
+    }
+}
+
 /// WebAssembly API for vidyut-prakriya.
 ///
 /// Within reason, we have tried to mimic a native JavaScript API. At some point, we wish to
@@ -343,4 +403,23 @@ impl Vidyut {
             }
         }
     }
+
+    /// Wrapper for `Vyakarana::derive_taddhitantas`.
+    #[allow(non_snake_case)]
+    pub fn deriveTaddhitantas(&self, val: JsValue) -> JsValue {
+        let v = Vyakarana::new();
+        let js_args: TaddhitantaArgs = serde_wasm_bindgen::from_value(val).unwrap();
+
+        match js_args.into_rust() {
+            Ok(args) => {
+                let prakriyas = v.derive_taddhitantas(&args);
+                let web_prakriyas = to_web_prakriyas(&prakriyas);
+                serde_wasm_bindgen::to_value(&web_prakriyas).expect("wasm")
+            }
+            Err(_) => {
+                error(&format!("[vidyut] Derivation error"));
+                serde_wasm_bindgen::to_value(&Vec::<WebPrakriya>::new()).expect("wasm")
+            }
+        }
+    }
 }