diff --git a/Cargo.lock b/Cargo.lock
index f5db06d..12f4cf7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -284,6 +284,7 @@ version = "0.1.0"
 dependencies = [
  "actix-web",
  "anyhow",
+ "serde",
  "tokio",
 ]
 
@@ -895,6 +896,20 @@ name = "serde"
 version = "1.0.183"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32ac8da02677876d532745a130fc9d8e6edfa81a269b107c5b00829b91d8eb3c"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.183"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aafe972d60b0b9bee71a91b92fee2d4fb3c9d7e8f6b179aa99f27203d99a4816"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.28",
+]
 
 [[package]]
 name = "serde_json"
diff --git a/Cargo.toml b/Cargo.toml
index 53d9a6b..84e421f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,4 @@ license = "MIT"
 tokio = { version = "1.29", features = ["macros", "rt-multi-thread", "sync"] }
 anyhow = "1.0"
 actix-web = "4"
+serde = { version = "1.0.183", features = ["derive"] }
diff --git a/src/api.rs b/src/api.rs
index 2dc9644..b183263 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -1,5 +1,6 @@
 use actix_web::{post, web, App, HttpResponse, HttpServer, Responder};
 use anyhow::Result;
+use serde::Deserialize;
 use tokio::sync::{mpsc, oneshot};
 
 use crate::call::Call;
@@ -8,11 +9,27 @@ struct ApiState {
     tx: mpsc::Sender<(Call, oneshot::Sender<Result<()>>)>,
 }
 
+#[derive(Debug, Deserialize)]
+struct AuthenticateData {
+    username: String,
+    password: String,
+}
+
 #[post("/authenticate")]
-async fn authenticate(data: web::Data<ApiState>) -> impl Responder {
+async fn authenticate(
+    data: web::Data<ApiState>,
+    body: web::Json<AuthenticateData>,
+) -> impl Responder {
     let (tx, rx) = oneshot::channel();
 
-    if let Err(_) = data.tx.send((Call::Authenticate, tx)).await {
+    if let Err(_) = data
+        .tx
+        .send((
+            Call::Authenticate(body.username.clone(), body.password.clone()),
+            tx,
+        ))
+        .await
+    {
         return HttpResponse::InternalServerError().finish();
     }
 
@@ -22,11 +39,24 @@ async fn authenticate(data: web::Data<ApiState>) -> impl Responder {
     }
 }
 
+#[derive(Debug, Deserialize)]
+struct RegisterData {
+    username: String,
+    password: String,
+}
+
 #[post("/register")]
-async fn register(data: web::Data<ApiState>) -> impl Responder {
+async fn register(data: web::Data<ApiState>, body: web::Json<RegisterData>) -> impl Responder {
     let (tx, rx) = oneshot::channel();
 
-    if let Err(_) = data.tx.send((Call::Register, tx)).await {
+    if let Err(_) = data
+        .tx
+        .send((
+            Call::Register(body.username.clone(), body.password.clone()),
+            tx,
+        ))
+        .await
+    {
         return HttpResponse::InternalServerError().finish();
     }
 
diff --git a/src/call.rs b/src/call.rs
index c629791..f6af7fa 100644
--- a/src/call.rs
+++ b/src/call.rs
@@ -3,9 +3,9 @@ use tokio::sync::{mpsc, oneshot};
 
 #[derive(Debug)]
 pub enum Call {
-    Register,
-    Authenticate,
-    Delete,
+    Register(String, String),
+    Authenticate(String, String),
+    Delete(String),
 }
 
 async fn worker(mut rx: mpsc::Receiver<(Call, oneshot::Sender<Result<()>>)>) -> Result<()> {