Unable to store loop information fetched from api into a JSON file

I'm currently facing an issue with my code where I am trying to save the results from looping through an API into a JSON file using writeFileSync. Here is the code snippet in question:

function processRarity(limit) {
    var resultJson = [];
    for (var i = limit; i < limit + 100; i++) {
      const everything = async () => {
        const response = await fetch(
          "https://api-v2-mainnet.paras.id/token/asac.near::" + i
        );
        var json = await response.json();
        return json;
      };
      everything().then((res) => {
        console.log(res);
        resultJson = res;
      });
    }
    fs.writeFileSync(`${basePath}/results.json`, JSON.stringify(resultJson, null, 2));
}

However, when I check the resulting JSON file, all I see is an empty array:

[]

Answer №1

It is important to remember to await the calls to everything() in your code.

Additionally, make sure you are appending to resultJson instead of overwriting it within each iteration of the loop.

const everything = async (i) => {
    const response = await fetch(
        "https://api-v2-mainnet.paras.id/token/asac.near::" + i
    );
    var json = await response.json();
    return json;
};


async function processRarity(limit) {
    var resultJson = [];
    for (var i = limit; i < limit + 100; i++) {
        let res = await everything(i);
        console.log(res);
        resultJson.push(res);
    }
    fs.writeFileSync(`${basePath}/results.json`, JSON.stringify(resultJson, null, 2));
}

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