Encountering an issue accessing a property retrieved from a fetch request in TypeScript

I am currently dealing with the property success defined in the API (reCAPTCHA).

/**
   * The structure of response from the veirfy API is
   * {
   *  "success": true|false,
   *  "challenge_ts": timestamp,  // timestamp of the challenge load (ISO format yyyy-MM-dd'T'HH:mm:ssZZ)
   *  "hostname": string,         // the hostname of the site where the reCAPTCHA was solved
   *  "error-codes": [...]        // optional
    }
   */

I attempted to use optional chaining below to solve this issue, but it proved unsuccessful. I also tried using an interface at different stages, but could not resolve the problem that way either.

Here is the code snippet:

import fetch from "node-fetch"
//...
try {
const response = await fetch(
  `https://www.google.com/recaptcha/api/siteverify?secret=${process.env.GOOGLE_RECAPTCHA_SECRETKEY}&response=${captcha}`,
  {
    headers: {
      "Content-Type": "application/x-www-form-urlencoded; charset=utf-8",
    },
    method: "POST",
  }
);

const captchaValidation = await response.json();
if(captchaValidation?.success) // error: Property 'success' does not exist on type '{}'

} catch (error) {}

How can I access that property successfully?

Answer №1

It appears that .json does not handle types correctly and returns Promis<never<. You can refer to the .json method

I have a suggestion where you declare the Captcha types and inform TypeScript that this type is correct

export interface CaptchaResponse {
  success: boolean;
  challenge_ts: string;
  hostname: string;     
  error-codes?: any[];
}


....
const rawResponse = await response.json();
// the next line simply states - believe me, it is of this type. It will not perform type checking
const typedResponse = rawResponse as CaptchaResponse;
if(typedResponse.success)

....

Answer №2

To ensure TypeScript recognizes the expected response structure, define an interface specifying the required properties. For example:

export interface APIResponse {
  success: boolean;
  challenge_ts: string;
  hostname: string;     
  error-codes?: any[];
}

Once the interface is defined, assign the response data to a variable of that type like this:

const captchaValidation: APIResponse = await response.json();

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