Google Calendar Credentials Generation Guide

How to generate Google Calendar ID and Google Calendar JSON for Calendar

Step 1: Open Google Cloud Console

• Visit: https://console.cloud.google.com
• Sign in with your Google Account.

Step 2: Create or Select a Project

• At the top menu, click the project dropdown.
• Click “New Project” if you don’t have one.
• Enter a Project name, then click Create.

Step 3: Enable Google Calendar API

• In the left sidebar, go to APIs & Services > Library
• Search for “Google Calendar API”
• Click it, then press Enable

Step 4: Create Service Account Credentials

• Go to APIs & Services > Credentials
• Click + Create Credentials > Service account
• Fill in:
• Name (e.g., calendar-service)
• Description (optional)
• Click Create and Continue
• (Optional) On the “Grant access” step, just click Done

Step 5: Download the JSON Key File

• After creating the service account, you’ll see it listed.
• Click the service account name
• Go to the Keys tab
• Click Add Key > Create new key
• Choose JSON → Click Create
• A .json file will download automatically. Keep it safe.
• This JSON contains:
  • client_email (important!)
  • private_key
  • Other OAuth credentials.

Step 6: Create a New Google Calendar

• Go to https://calendar.google.com
• On the left, click the + icon next to “Other calendars”
• Choose Create new calendar
• Set:
  • Name (e.g., API Events)
  • Description (optional)
• Click Create calendar

Step 7: Share Calendar Access with Service Account

• Select your new calendar in the left sidebar
• Click the Settings icon ⚙️ > Settings
• Scroll to “Share with specific people or groups”
• Click + Add people and groups
• Paste the client_email from your JSON file (e.g., calendar-api@your-project.iam.gserviceaccount.com)
• Set permission to: Make changes and manage sharing
• Click Send
• Now, your service account has write access to the calendar.

Step 8: Get the Calendar ID

• Still in Calendar Settings
• Scroll to the “Integrate calendar” section
• Copy the Calendar ID — it looks like:
• yourcalendar@gmail.com
• or abc123@group.calendar.google.com