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Fixing Google Drive “The API developer key is invalid” (Google Picker Error)

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✅ Fixing Google Drive “The API developer key is invalid” (Google Picker Error)

This error comes from Google Picker, not Google Drive.
Google Picker requires a valid API Key, and if the API Key is missing, incorrect, or restricted, you will see:

The API developer key is invalid

To fix this, follow the instructions below.


🔧 Step-by-Step Setup Guide (Google Drive + Google Picker)

1️⃣ Enable Required Google APIs

Go to Google Cloud → APIs & Services → Library
Enable these APIs:

  • Google Drive API

  • Google Picker API

  • (Optional) Google People API


2️⃣ Create Required Credentials

Go to Google Cloud → APIs & Services → Credentials

You must create three items:

A. API Key

Used by Google Picker popup.

B. OAuth Client ID

Used to log in with Google Drive.

C. OAuth Client Secret

Also used for OAuth login.


3️⃣ Configure the OAuth Redirect URI

Copy the redirect URL from your Stackposts settings, for example:

https://yourdomain.com/google/callback

Paste it into:

Google Cloud → Credentials → OAuth Client → Authorized redirect URIs


4️⃣ Configure the API Key (IMPORTANT)

Your API Key must be:

  • Active

  • Not restricted incorrectly

  • Allowed to use Google Picker + Drive API

If you want to restrict it, use:

Application restrictions:
→ HTTP referrers (websites)

Allowed domains:

https://yourdomain.com/*

🎉 After Completing These Steps

Google Drive will login correctly using OAuth,
and Google Picker popup will work using your API Key,
so the error:

“The API developer key is invalid”

will disappear.

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