diff --git a/frontend/Cargo.toml b/frontend/Cargo.toml
index 2f7baad..7c3cc19 100644
--- a/frontend/Cargo.toml
+++ b/frontend/Cargo.toml
@@ -25,6 +25,10 @@ console_error_panic_hook = { version = "0.1.1", optional = true }
 #
 # Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
 wee_alloc = { version = "0.4.2", optional = true }
+serde = "1.0.99"
+serde_derive = "1.0.99"
+serde_json = "1.0"
+lazy_static = "1.4.0"
 
 [dev-dependencies]
 wasm-bindgen-test = "0.2"
diff --git a/frontend/src/lib.rs b/frontend/src/lib.rs
index 80ffdf7..2a34709 100644
--- a/frontend/src/lib.rs
+++ b/frontend/src/lib.rs
@@ -1,4 +1,15 @@
+extern crate serde;
+#[macro_use]
+extern crate serde_derive;
+extern crate serde_json;
+
+#[macro_use]
+extern crate lazy_static;
+
+use std::sync::{Arc, Mutex};
+
 mod utils;
+mod types;
 
 use wasm_bindgen::prelude::*;
 
@@ -8,12 +19,20 @@ use wasm_bindgen::prelude::*;
 #[global_allocator]
 static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
 
+lazy_static! {
+    static ref STATE: Mutex<Box<types::State>> = Mutex::new(Box::new(types::State {
+        planets: Vec::new(),
+        expeditions: Vec::new(),
+    }));
+}
+
 #[wasm_bindgen]
 extern {
     fn alert(s: &str);
 }
 
 #[wasm_bindgen]
-pub fn greet(name: &str) {
-    alert(&format!("Hello, {}!", name));
+pub fn set_state(state: &str) {
+    let deserialized: types::State = serde_json::from_str(state).unwrap();
+    *STATE.lock().unwrap() = Box::new(deserialized);
 }
diff --git a/frontend/src/types.rs b/frontend/src/types.rs
new file mode 100644
index 0000000..260030b
--- /dev/null
+++ b/frontend/src/types.rs
@@ -0,0 +1,25 @@
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Expedition {
+    pub id: u64,
+    pub ship_count: u64,
+    pub origin: String,
+    pub destination: String,
+    pub owner: u64,
+    pub turns_remaining: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Planet {
+    pub ship_count: u64,
+    pub x: f64,
+    pub y: f64,
+    pub owner: Option<u32>,
+    pub name: String,
+}
+
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct State {
+    pub planets: Vec<Planet>,
+    pub expeditions: Vec<Expedition>,
+}