diff --git a/api/core.py b/api/core.py
index abaac92..e2e7fbe 100644
--- a/api/core.py
+++ b/api/core.py
@@ -50,6 +50,9 @@ async def get_users(discord_id: int, incoming_request: fastapi.Request):
     if not user:
         return await errors.error(404, 'Discord user not found in the API database.', 'Check the `discord_id` parameter.')
 
+    # turn the ObjectId into a string
+    user['_id'] = str(user['_id'])
+
     return user
 
 async def new_user_webhook(user: dict) -> None:
@@ -90,6 +93,8 @@ async def create_user(incoming_request: fastapi.Request):
     user = await manager.create(discord_id)
     await new_user_webhook(user)
 
+    user['_id'] = str(user['_id'])
+
     return user
 
 @router.put('/users')
diff --git a/api/main.py b/api/main.py
index c7f95e3..9e6fd9e 100644
--- a/api/main.py
+++ b/api/main.py
@@ -5,7 +5,9 @@ import pydantic
 
 from rich import print
 from dotenv import load_dotenv
+
 from bson.objectid import ObjectId
+
 from slowapi.errors import RateLimitExceeded
 from slowapi.middleware import SlowAPIMiddleware
 from fastapi.middleware.cors import CORSMiddleware