diff --git a/src/util/api.ts b/src/util/api.ts
new file mode 100644
index 0000000..43536d3
--- /dev/null
+++ b/src/util/api.ts
@@ -0,0 +1,76 @@
+// This file contains types and functions related to interacting with the API.
+const URL = "https://shitpost.se";
+
+export interface NewPost {
+  content: string;
+  token: string;
+}
+
+interface Votes {
+  up: number;
+  down: number;
+}
+
+export interface Post extends NewPost {
+  id: string;
+  createdAt: string;
+  votes: Votes;
+}
+
+// This is what the login and registration responses look like
+export interface AuthResponse {
+  username: string;
+  token: string;
+}
+
+export async function getPosts(): Promise<Post[]> {
+  const res = await fetch("/api/posts");
+  const data = await res.json();
+  return data;
+}
+
+export async function getPost(id: string): Promise<Post> {
+  const res = await fetch(`/api/posts/${id}`);
+  const data = await res.json();
+  return data;
+}
+
+export async function createPost(post: NewPost): Promise<void> {
+  await fetch("/api/posts", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(post),
+  });
+}
+
+// Send the registration request to the server
+export async function submitRegistration(
+  username: string,
+  password: string,
+  captcha: string
+): Promise<AuthResponse | undefined> {
+  const response = await fetch("/api/register", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ username, password, captcha }),
+  });
+
+  if (response.ok) return await response.json();
+}
+
+// Send the login request to the server
+export async function submitLogin(
+  username: string,
+  password: string
+): Promise<AuthResponse | undefined> {
+  if (username == "" || password == "") return;
+  const response = await fetch("/api/login", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ username, password }),
+  });
+
+  if (response.ok) return await response.json();
+}