Encountering an error while executing a RapidAPI call with async/await

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1

I’m facing an error when I attempt to perform a GET request through RapidAPI. The error message reads as follows:

Uncaught (in promise) ReferenceError: Cannot access 'fetchDetails' before initialization

Here’s the code I’m working with:

const API_KEY = import.meta.env.VITE_API_KEY;
const API_URL = "https://some-api-url.com/data?format=json";
const API_HOST = "some-api-url.com";

const fetchDetails = async (url, host) => {
  const result = await fetch(url, {
    method: "GET",
    headers: {
      'Accept': 'application/json',
      'x-api-host': host,
      'x-api-key': API_KEY
    }
  });

  if (!result.ok) {
    throw new Error(`HTTP error! status: ${result.status}`);
  }

  return await result.json();
};

const executeApiCalls = async () => {
  const data = await fetchDetails(API_URL, API_HOST);
  console.log(data);
};

executeApiCalls();
2

Hi Alice45,

The error you're encountering, "Cannot access 'fetchDetails' before initialization", typically occurs when you try to use the function before it's fully defined and available in the scope. Let's resolve this step-by-step to ensure efficient functioning of your asynchronous call using RapidAPI:

  1. Ensure that the function fetchDetails is properly declared before it's called. In your code, the order already looks correct.
  2. Make sure there're no additional scopes where fetchDetails might be unintentionally referenced before its declaration, which could lead to this error.
  3. Verify that the imported values like API_KEY in your environment variables are correctly accessed using import.meta.env. Any errors in fetching these can cause undefined behaviors.

The code seems logically correct, but ensure the environment is perfectly set. If the problem persists, try this in a new file or comment out other parts of your broader codebase that might influence execution flow.

By following these steps, your async/await structure should work flawlessly, optimizing your API call process efficiently.

3

Error messages like "Cannot access 'fetchDetails' before initialization" suggest that your JavaScript code is attempting to reference a variable or function before it's been properly defined. Here's a breakdown of what you should check:

  1. Variable Declaration Order: Your function fetchDetails is indeed correctly placed before you call it in executeApiCalls, indicating that the error might require a closer look.
  2. Variable Scope and Hoisting: Double-check to ensure that no scopes unintentionally overlap or cause a hoisting issue. Try running a test to call another dummy function with similar scope to pinpoint any shadows or conflicts.
  3. Environment Configuration: Confirm that your environment variable API_KEY is being accessed correctly. Improper or undefined configurations can sometimes lead to misleading errors.

If these steps don’t resolve the problem, consider stripping down the code to its essentials and gradually adding parts back, which might help isolate where the issue arises.

You might also try running the code outside of any module-specific environments (e.g., bundlers like Vite) to see if the problem lies with how modules are handled or imported.

Lastly, ensure that you have no additional code executing elsewhere that might cause the function to be invoked before declaration via inadvertent hoisting or scoping assumptions.

4

Hi Alice45,

The error message "Cannot access 'fetchDetails' before initialization" you’re encountering suggests a potential scoping issue. Here’s how you can resolve it efficiently:

  1. Check Function Declaration: Ensure fetchDetails is always declared before any reference. Your existing structure seems correct, but double-check for any unexpected scopes possibly redefining or redeclaring it.
  2. Environment Variable Verification: Confirm that API_KEY is properly set in your environment file and accessible via import.meta.env. A missing or undefined value can sometimes cause peculiar errors.
  3. Code Isolation: Comment out other parts of your code to isolate this function within a new minimal environment. Gradually reintroduce other code components to pinpoint the source of the issue.

Create a simple example by using a basic method to call another static function first, ensuring no scoping issues appear:

const testFunction = async () => { 
  console.log('Test function executed');
};

testFunction();

If the function calls correctly, reintroduce your fetchDetails and revisit the usage flow. Running the code in a standalone environment outside of any specific module bundler like Vite might also help identify if it's a module-related issue.

Implement these steps, and you should see improved PHP API call workflows.