[HELP] get error "TypeError: Cannot read properties of undefined (reading 'replace')"

[hapnan]

hi, I get an error when I want to do startRegistration(), even though all the data has been placed correctly

I put the code below

const resp = await fetch(
      "http://localhost:3000/api/registration?nim=${data.nim}",
      {
        method: "GET",
        headers: {
          "Content-Type": "application/json",
        },
      },
    );

    let attResp: RegistrationResponseJSON;
    try {
      attResp = await startRegistration(await resp.json());
      console.log("Registration Response :", JSON.stringify(attResp));
    } catch (error) {
      if (error instanceof Error) {
        if (error.name == "InvalidStateError") {
          console.log(
            "Error: Authenticator was probably already registered by user",
          );
        } else {
          console.log(error);
        }
      }
      throw error;
    }

[wparad]

What is the value of await resp.json() here?

[hapnan]

response of generateRegistrationOptions()