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Callbacks are optional functions that allow you to take actions in your app or send logs to your backend based on where your user is in the authentication flow.

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onEvent

A function that is called when the Stytch client makes a request. The function expects an argument of an event object, and the event object has type and data objects. 
{
  "type": "MAGIC_LINK_LOGIN_OR_CREATE",
  "data": {
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "OTP_LOGIN_OR_CREATE",
  "data": {
    "method_id": "phone-number-test-d5a3b680-e8a3-40c0-b815-ab79986666d0",
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "OTP_AUTHENTICATE",
  "data": {
    "method_id": "phone-number-test-d5a3b680-e8a3-40c0-b815-ab79986666d0",
    "user_id": "user-test-16d9ba61-97a1-4ba4-9720-b03761dc50c6",
    "user": { ...Stytch user... },
    "session_token": "mZAYn5aLEqKUlZ_Ad9U_fWr38GaAQ1oFAhT8ds245v7Q",
    "session_jwt": "example_jwt",
    "session": { ...Stytch session... },
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "CRYPTO_WALLET_AUTHENTICATE_START",
  "data": {
    "challenge": "Signing in with Project: 7_EPetPqfdEiDCJtgad6-xsXytN3Ee9tx6mdRTQK3fC7-J2PDxpP1GAvYB9Ic4E09h-K88STiRIzKSGP",
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "CRYPTO_WALLET_AUTHENTICATE",
  "data": {
    "user_id": "user-test-16d9ba61-97a1-4ba4-9720-b03761dc50c6",
    "user": { ...Stytch user... },
    "session_token": "mZAYn5aLEqKUlZ_Ad9U_fWr38GaAQ1oFAhT8ds245v7Q",
    "session_jwt": "example_jwt",
    "session": { ...Stytch session... },
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "PASSWORD_CREATE",
  "data": {
    "email_id": "email-test-81bf03a8-86e1-4d95-bd44-bb3495224953",
    "user_id": "user-test-16d9ba61-97a1-4ba4-9720-b03761dc50c6",
    "user": { ...Stytch user... },
    "session_token": "mZAYn5aLEqKUlZ_Ad9U_fWr38GaAQ1oFAhT8ds245v7Q",
    "session_jwt": "example_jwt",
    "session": { ...Stytch session... },
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "PASSWORD_AUTHENTICATE",
  "data": {
    "user_id": "user-test-16d9ba61-97a1-4ba4-9720-b03761dc50c6",
    "user": { ...Stytch user... },
    "session_token": "mZAYn5aLEqKUlZ_Ad9U_fWr38GaAQ1oFAhT8ds245v7Q",
    "session_jwt": "example_jwt",
    "session": { ...Stytch session... },
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "PASSWORD_RESET_BY_EMAIL_START",
  "data": {
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "PASSWORD_RESET_BY_EMAIL",
  "data": {
    "user_id": "user-test-16d9ba61-97a1-4ba4-9720-b03761dc50c6",
    "user": { ...Stytch user... },
    "session_token": "mZAYn5aLEqKUlZ_Ad9U_fWr38GaAQ1oFAhT8ds245v7Q",
    "session_jwt": "example_jwt",
    "session": { ...Stytch session... },
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
},
{
  "type": "PASSKEY_AUTHENTICATE",
  "data": {
    "webauthn_registration_id": "webauthn-registration-test-5c44cc6a-8af7-48d6-8da7-ea821342f5a6",
    "user_id": "user-test-16d9ba61-97a1-4ba4-9720-b03761dc50c6",
    "user": { ...Stytch user... },
    "session_token": "mZAYn5aLEqKUlZ_Ad9U_fWr38GaAQ1oFAhT8ds245v7Q",
    "session_jwt": "example_jwt",
    "session": { ...Stytch session... },
    "request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
    "status_code": 200
  }
}

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onError

A function that is called when an error occurs. The function expects an argument of an StytchError object, and the StytchError object has a message property. 
// Example of an API related error.
"message": "StytchSDKAPIError: [401] unauthorized_credentials Unauthorized credentials. See https://stytch.com/docs/api/errors/401 for more information. request_id: request-id-test-8e2a9758-713e-49a2-8b62-f9169bbabded",

// Example of a network related error.
"message": "SDKAPIUnreachableError: Failed to send magic link Unable to contact the Stytch servers. Are you online?"

// Example of a schema related error.
"message": "StytchSDKSchemaError: [400] Request does not match expected schema. email: should be string"

// Example of an error with using our SDK.
"message": "StytchSDKUsageError: Invalid call to <METHOD_NAME>"