Meta Conversions API Testing Guide

How to Test with Facebook Click ID (fbclid)

To properly test the Meta Conversions API with click tracking:

1. Simulate coming from a Facebook ad by adding ?fbclid=test_click_id_123 to any URL on this site
2. Example: Try this test link
3. When you click this link, our script will automatically create the proper _fbc cookie
4. After the cookie is set, complete a conversion action like registration or purchase
5. Verify in the diagnostic endpoint that the fbc value is being sent properly

Check Your Current Cookies

Your current _fbc cookie value:

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Test Diagnostic Endpoint

Use our diagnostic endpoint to test if the Conversions API is receiving your fbc value:

fbc Cookie Format

The _fbc cookie follows this format:

fb.{subdomain_index}.{creation_time}.{fbclid}

Example: fb.1.1554763741205.AbCdEfGhIjKlMnOpQrStUvWxYz1234567890

Common Issues

• Missing _fbc cookie - Make sure to simulate a click with ?fbclid= parameter
• Incorrect format - The _fbc cookie must follow the exact format shown above
• Cookie parsing - Make sure the server-side code is correctly extracting the _fbc cookie
• Not passing to API - Verify the fbc field is included in the event data