Midjourney API Error 401: Unauthorized Fix Guide

Midjourney does not offer an official public REST API. To programmatically generate images, developers rely on Discord bot integrations, self-hosted Discord command automations, or third-party API wrappers (such as ImagineAPI).

When your application receives an HTTP 401 Unauthorized response code, it means the receiving server has rejected your connection request because the authentication credentials provided are missing, expired, or improperly formatted. Use this step-by-step troubleshooting guide to resolve Midjourney-related 401 errors.

1. Format the Authorization Header Correctly

The most common cause of a 401 error is a syntax mistake in your HTTP request headers. Different integration methods require specific formatting for authorization keys.

1. Open your code or API development tool (such as Postman).
2. Locate the headers of your outgoing request.
3. Verify that the key is named exactly Authorization.
4. Check the value formatting:
5. For third-party APIs: Ensure you have included the prefix Bearer followed by a space and your API key (e.g., Authorization: Bearer your_api_key_here).
6. For Discord User Token automations: Some wrappers require the raw token without the Bearer prefix. Check your wrapper's documentation to see if it expects Authorization: your_token or Authorization: Bot your_token.
7. Remove any accidental white spaces, quotation marks, or trailing slashes from the token string.

2. Refresh and Replace Expired Discord Tokens

If you are using a Discord user token (often retrieved via browser developer tools to automate Midjourney commands), these tokens expire or invalidate frequently due to security measures.

1. Check for password changes: If you recently changed your Discord password, Discord automatically invalidates all existing user tokens. You must extract your new token.
2. Extract a fresh token:
3. Log in to Discord in your web browser.
4. Press F12 (or Cmd + Option + I on Mac) to open Developer Tools.
5. Go to the Network tab and trigger any action (like sending a message or viewing a channel).
6. Look for a request named /science or /messages.
7. Under the Request Headers section, find the authorization field and copy the long alphanumeric string.
8. Paste this new token into your environment variables or config file and restart your application.

3. Verify Third-Party API Subscription Status

If you use a commercial third-party gateway to access Midjourney, a 401 error often points to billing or account suspensions rather than code syntax.

1. Log in to the administrative dashboard of your third-party Midjourney API provider.
2. Check your billing dashboard to confirm your subscription is active and has not expired due to a failed payment.
3. Look at your usage limits. Some providers return a 401 Unauthorized or 403 Forbidden once your monthly generation limit or credit balance reaches zero.
4. Generate a completely new API token from your provider's developer console, replace the old one in your code, and test the connection again.

4. Bypass Cloudflare and IP Rate Blocks

Discord and API wrapper gateways utilize robust Web Application Firewalls (WAF) like Cloudflare to block automated traffic. If Cloudflare flags your server's IP address, it may reject your API requests with a 401 or 403 error page.

1. Inspect the response body: Look at the raw HTML returned with the 401 code. If you see a "Cloudflare" or "Just a moment" challenge page, your IP has been flagged.
2. Implement a proxy: Route your requests through a high-quality residential proxy or a virtual private server (VPS) with a clean IP address.
3. Rotate user agents: Ensure your wrapper sends a realistic user-agent header that mimics a standard web browser, as bare backend requests (like those from Node.js or Python requests) are easily flagged.

5. Update Outdated API Wrappers

Midjourney regularly updates its Discord slash command schema. When this occurs, older third-party SDKs and wrapper libraries can send outdated payloads, causing Discord to reject the connection with a 401/400 error range.

1. Open your terminal or command prompt.
2. Run the update command for your package manager to fetch the latest version of your Midjourney integration library (e.g., npm update midjourney or pip install --upgrade midjourney-api-wrapper).
3. Review the library's GitHub repository or release notes to check if recent Discord API changes require a patch or an update to your environment variables.

When to escalate

If you have verified your headers, confirmed your tokens are active, and updated your SDK, but still receive a 401 error, the issue lies with the authentication provider.

• If using a third-party API: Contact that provider's support team directly or check their status page for systemic authentication server outages.
• If using self-hosted Discord bots: Check if your bot has been quarantined or rate-limited by Discord's Trust & Safety team. You may need to create a new Discord application token inside the Discord Developer Portal.