diff --git a/apps/server/src/routes/api/note_map.ts b/apps/server/src/routes/api/note_map.ts
index 684227009..f621c7b2f 100644
--- a/apps/server/src/routes/api/note_map.ts
+++ b/apps/server/src/routes/api/note_map.ts
@@ -116,7 +116,7 @@ function getLinkMap(req: Request) {
         }).notes;
     }
 
-    const noteIds = new Set(unfilteredNotes.filter((note) => ignoreExcludeFromNoteMap || !note.isLabelTruthy("excludeFromNoteMap")).map((note) => note.noteId));
+    const noteIds = new Set<string>(unfilteredNotes.filter((note) => ignoreExcludeFromNoteMap || !note.isLabelTruthy("excludeFromNoteMap")).map((note) => note.noteId));
 
     if (mapRootNote.type === "search") {
         noteIds.delete(mapRootNote.noteId);
diff --git a/apps/server/src/routes/api/notes.ts b/apps/server/src/routes/api/notes.ts
index f8e152320..40a955be9 100644
--- a/apps/server/src/routes/api/notes.ts
+++ b/apps/server/src/routes/api/notes.ts
@@ -118,7 +118,7 @@ function createNote(req: Request) {
         throw new ValidationError("Missing or incorrect type for target branch ID.");
     }
 
-    const { note, branch } = noteService.createNewNoteWithTarget(target, targetBranchId, params);
+    const { note, branch } = noteService.createNewNoteWithTarget(target, String(targetBranchId), params);
 
     return {
         note,
diff --git a/apps/server/src/routes/route_api.ts b/apps/server/src/routes/route_api.ts
index c2c1ef2d7..5a4f490c8 100644
--- a/apps/server/src/routes/route_api.ts
+++ b/apps/server/src/routes/route_api.ts
@@ -1,4 +1,4 @@
-import express from "express";
+import express, { type RequestHandler } from "express";
 import multer from "multer";
 import log from "../services/log.js";
 import cls from "../services/cls.js";
@@ -166,7 +166,7 @@ function handleException(e: unknown | Error, method: HttpMethod, path: string, r
 
 }
 
-export function createUploadMiddleware() {
+export function createUploadMiddleware(): RequestHandler {
     const multerOptions: multer.Options = {
         fileFilter: (req: express.Request, file, cb) => {
             // UTF-8 file names are not well decoded by multer/busboy, so we handle the conversion on our side.
diff --git a/apps/server/src/routes/session_parser.ts b/apps/server/src/routes/session_parser.ts
index b036657a2..240341ef7 100644
--- a/apps/server/src/routes/session_parser.ts
+++ b/apps/server/src/routes/session_parser.ts
@@ -3,6 +3,7 @@ import session, { Store } from "express-session";
 import sessionSecret from "../services/session_secret.js";
 import config from "../services/config.js";
 import log from "../services/log.js";
+import type express from "express";
 
 class SQLiteSessionStore extends Store {
 
@@ -51,7 +52,7 @@ class SQLiteSessionStore extends Store {
 
 }
 
-const sessionParser = session({
+const sessionParser: express.RequestHandler = session({
     secret: sessionSecret,
     resave: false, // true forces the session to be saved back to the session store, even if the session was never modified during the request.
     saveUninitialized: false, // true forces a session that is "uninitialized" to be saved to the store. A session is uninitialized when it is new but not modified.
diff --git a/apps/server/src/services/script.ts b/apps/server/src/services/script.ts
index 50bbb9fd5..aedab83bf 100644
--- a/apps/server/src/services/script.ts
+++ b/apps/server/src/services/script.ts
@@ -5,7 +5,7 @@ import becca from "../becca/becca.js";
 import type BNote from "../becca/entities/bnote.js";
 import type { ApiParams } from "./backend_script_api_interface.js";
 
-interface Bundle {
+export interface Bundle {
     note?: BNote;
     noteId?: string;
     script: string;