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CORS and 401 Unauthorized Issues on Appwrite Cloud (Frontend SDK)

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Jonas @ Christ's Seeds
14 Jul, 2025, 02:13

I'm developing a frontend app using the Appwrite Web SDK on http://localhost:3000, and I'm encountering two issues when trying to register or log in users:

CORS Error: Requests to https://cloud.appwrite.io/v1/account are being blocked with the error: "No 'Access-Control-Allow-Origin' header is present..." I cannot add http://localhost:3000 as a CORS origin in the Appwrite Cloud Console (platform settings > Web App).

401 Unauthorized: Even when using the official Appwrite SDK (account.create() and account.createSession()), the requests fail with 401 Unauthorized and TypeError: Failed to fetch.

I'm not using any API keys or manual fetch() calls—only the SDK. It appears the issue is related to the Cloud-hosted Appwrite environment not allowing custom local origins.

Can you confirm if local dev origins like http://localhost:3000 are supported in Appwrite Cloud? If not, what is the recommended workaround for local development?

TL;DR
Frontend developers using Appwrite Web SDK are facing CORS error and 401 Unauthorized issues on http://localhost:3000. They cannot add localhost as a CORS origin in the Appwrite Cloud Console and requests are failing due to the Appwrite environment not allowing custom local origins. A workaround would be to use a tool like ngrok for local development.
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