Use result of HTTPS GET request [Node.js] [duplicate]

Answer 1

You could write a promise-based wrapper for your function:

function getMyFile() {
  var https = require('https');

  return new Promise((resolve, reject) => {
      https.get('URL_I_am_targeting/file.json', (res) => {
        var { statusCode } = res;
        var contentType = res.headers['content-type'];

        let error;

        if (statusCode !== 200) {
          error = new Error('Request Failed.\n' +
            `Status Code: ${statusCode}`);
        } else if (!/^application\/json/.test(contentType)) {
          error = new Error('Invalid content-type.\n' +
            `Expected application/json but received ${contentType}`);
        }

        if (error) {
          console.error(error.message);
          // consume response data to free up memory
          res.resume();
        }

        res.setEncoding('utf8');
        let rawData = '';

        res.on('data', (chunk) => {
          rawData += chunk;
        });

        res.on('end', () => {
          try {
            const parsedData = JSON.parse(rawData);
            resolve(parsedData);
          } catch (e) {
            reject(e.message);
          }
        });
      }).on('error', (e) => {
        reject(`Got error: ${e.message}`);
      });

    });
  }

So that, you can use the function like this:

getMyFile()
  .then(response => {
    // handle success response here
  })
  .catch(error => {
    // handle error here
  });

Answer 2

function getMyFile() {
  return new Promise((resolve,reject)=>{
    //your logic and data manipulations here and finally resolve the variable
    
  resolve(parsedData)
  })
}

call it like this

getMyFile().then((parsedData)=>{
    //parsedData is the returned value u needed
}).catch((error)=>{
    //if any error handle it
})