Question 74596 in Javascript Question posted in
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How do tell JS that my api fetch link is NOT ok when it thinks it is? – Javascript

I’m having this issue with certain API’s, where invalid links are still "ok". Here for the ticker symbol I typed a bunch of random letters in place of an actual ticker: …ticker=AAsdfsPL… as opposed to …ticker=AAPL… The API link itself still doesn’t produce an error even though it doesn’t really fetch any data. Any way to fix this or do I need to use a different API?

const resStock = await fetch(
      `https://api.polygon.io/v3/reference/tickers?ticker=AAsdfsPL&active=true&apiKey=key`
    );
    console.log(resStock.ok); //still returns true even though link doesn't do anything.
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2

Answers


  1. 0

    You can distiguish the result whether it contains data or not

    const resStock = await fetch(
   `https://api.polygon.io/v3/reference/tickers?ticker=AAsdfsPL&active=true&apiKey=6P2qV_oNdXnkkmnd5Vb5VtQWi09OIzfU`
)

if(resStock.results){
  //do the next steps
}
else {
   // you are not getting data, so throw error if you want to 
}
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  2. 0

    In this particular case, you can check for the count property in the returned JSON to determine whether the result is valid or not:

    (async function () {
  const resStock = await fetch(
    `https://api.polygon.io/v3/reference/tickers?ticker=AAPsL&active=true&apiKey=6P2qV_oNdXnkkmnd5Vb5VtQWi09OIzfU`
  );
  let json;
  try {
    json = await resStock.json();
  } catch (e) {
    // Ignored
  }
  const isOk = json && !!json.count;
  console.log(isOk);
})();

    Documentation: https://polygon.io/docs/stocks/get_v3_reference_tickers

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