Coinbase provider - CallbackRouteError

Provider type

Coinbase

Environment

 System:
    OS: Windows 10 10.0.19045
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 9.29 GB / 15.56 GB
  Binaries:
    Node: 22.12.0 - C:\Program Files\nodejs\node.EXE      
    Yarn: 1.22.22 - ~\.bun\bin\yarn.EXE
    npm: 10.9.0 - C:\Program Files\nodejs\npm.CMD
    bun: 1.1.42 - ~\.bun\bin\bun.EXE
  Browsers:
    Edge: Chromium (131.0.2903.99)
    Internet Explorer: 11.0.19041.4355
  npmPackages:
    @auth/prisma-adapter: ^2.7.4 => 2.7.4
    next: 15.1.2 => 15.1.2
    next-auth: ^5.0.0-beta.25 => 5.0.0-beta.25
    react: ^19.0.0 => 19.0.0

Reproduction URL

https://github.com/wilkinnovo/auth-example

Describe the issue

Coinbase app API may have changed. It is not sending the correct content type in the response when sending request to https://api.coinbase.com/v2/user . Content-Type appears to be: 'content-type': 'application/protobuf'. making the call to .json() give error as follows:  

[auth][error] CallbackRouteError: Read more at https://errors.authjs.dev#callbackrouteerror
[auth][cause]: SyntaxError: Unexpected token '�', "
�

$a851b4"... is not valid JSON
at JSON.parse ()
at parseJSONFromBytes (node:internal/deps/undici/undici:5731:19)
at successSteps (node:internal/deps/undici/undici:5712:27)
at fullyReadBody (node:internal/deps/undici/undici:4609:9)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async consumeBody (node:internal/deps/undici/undici:5721:7)
.....

How to reproduce

Clone the repo and run the application with the credentials from coinbase and prisma DB url string.

Expected behavior

Respond with JSON data as follows:

curl https://api.coinbase.com/v2/user /
-H 'Authorization: Bearer 6915ab99857fec1e6f2f6c078583756d0c09d7207750baea28dfbc3d4b0f2cb80'

Example response:

{
"data": {
"id": "9da7a204-544e-5fd1-9a12-61176c5d4cd8",
"name": "User One",
"username": "user1",
"profile_location": null,
"profile_bio": null,
"profile_url": "https://coinbase.com/user1",
"avatar_url": "https://images.coinbase.com/avatar?h=vR%2FY8igBoPwuwGren5JMwvDNGpURAY%2F0nRIOgH%2FY2Qh%2BQ6nomR3qusA%2Bh6o2%0Af9rH&s=128",
"resource": "user",
"resource_path": "/v2/user"
}
}

Start by cloning the linked auth-example repository and reproducing the Coinbase callback with the listed credentials and environment. Inspect the request to https://api.coinbase.com/v2/user and its response content type, then determine whether the callback can receive the expected JSON or whether the behavior is external to the provider.