response.json

{
  "publicKey": {
    "attestation": null,
    "authenticatorSelection": {
      "authenticatorAttachment": null,
      "requireResidentKey": false,
      "residentKey": "discouraged",
      "userVerification": "discouraged"
    },
    "challenge": "gZplrGz5QfN-uiTIKrUpthij8i-C1NoFx1d2kKH0QDk",
    "excludeCredentials": [],
    "pubKeyCredParams": [
      {
        "alg": -7,
        "type": "public-key"
      },
      {
        "alg": -8,
        "type": "public-key"
      },
      {
        "alg": -35,
        "type": "public-key"
      },
      {
        "alg": -36,
        "type": "public-key"
      },
      {
        "alg": -37,
        "type": "public-key"
      },
      {
        "alg": -257,
        "type": "public-key"
      },
      {
        "alg": -47,
        "type": "public-key"
      }
    ],
    "rp": {
      "id": "localhost",
      "name": "My WebAuthn Server"
    },
    "timeout": null,
    "user": {
      "displayName": "Test User",
      "id": "6D_Hbdf3Wdg",
      "name": "test_user"
    }
  }
}