diff --git a/deps/scrapbox.ts b/deps/scrapbox.ts
index 7abfa7f..42a59ec 100644
--- a/deps/scrapbox.ts
+++ b/deps/scrapbox.ts
@@ -3,10 +3,12 @@ export type {
   ExportedData,
   GuestUser,
   ImportedData,
+  MemberProject,
   MemberUser,
   NotFoundError,
   NotLoggedInError,
   NotMemberError,
+  NotMemberProject,
   NotPrivilegeError,
   Page,
   Scrapbox,
diff --git a/rest/project.ts b/rest/project.ts
new file mode 100644
index 0000000..8886e0a
--- /dev/null
+++ b/rest/project.ts
@@ -0,0 +1,61 @@
+export async function getProjectId(project: string) {
+  const res = await fetch(`https://scrapbox.io/api/projects/${project}`);
+  const json = (await res.json()) as MemberProject;
+  return json.id;
+}
+
+import type {
+  MemberProject,
+  NotFoundError,
+  NotLoggedInError,
+  NotMemberError,
+  NotMemberProject,
+} from "../deps/scrapbox.ts";
+import { cookie, makeCustomError, Result, tryToErrorLike } from "./utils.ts";
+
+export interface ProjectInit {
+  /** connect.sid */ sid: string;
+}
+/** get the project information
+ *
+ * @param project project name to get
+ * @param init connect.sid etc.
+ */
+export async function getProject(
+  project: string,
+  init?: ProjectInit,
+): Promise<
+  Result<
+    MemberProject | NotMemberProject,
+    NotFoundError | NotMemberError | NotLoggedInError
+  >
+> {
+  const path = `https://scrapbox.io/api/projects/${project}`;
+  const res = await fetch(
+    path,
+    init?.sid
+      ? {
+        headers: {
+          Cookie: cookie(init.sid),
+        },
+      }
+      : undefined,
+  );
+
+  if (!res.ok) {
+    const value = tryToErrorLike(await res.json()) as
+      | false
+      | NotFoundError
+      | NotMemberError
+      | NotLoggedInError;
+    if (!value) {
+      throw makeCustomError(
+        "UnexpectedError",
+        `Unexpected error has occuerd when fetching "${path}"`,
+      );
+    }
+    return { ok: false, value };
+  }
+  const value = (await res.json()) as MemberProject | NotMemberProject;
+  return { ok: true, value };
+}