Between 8:00 - 9:00 am ET on 10/25 we need to take our site down to make updates. We recommend logging out before 8:00am ET and not using your account during this time. Thank you for your patience while we make these important updates.

API Code error 0 :401 Unauthorized

Regular Participant

API Code error 0 :401 Unauthorized

When I paste this url in my browser and put my username and password in it doesn't work. I've tried every username and password that I have and nothing. The reason I put this url in my browser is my API Code gives my 0 :401 Unauthorized on my web page.


The URL you are trying to access is complete. Try accessing:{YOUR_USERNAME}/

Also, make sure that the username that you provide in the pop-up is your api-key, followed by a '%', and then your constant contact login name like such:


 Also, if you are doing this for testing purposes, I recommend using RESTClient.

Dan H

Support Engineer, Constant Contact

Developer Portal

View API documentation, code samples, get your API key.

Visit Page