JavaScript: Fetching Stream Responses from APIs using ReadableStream

To get a stream response from an API in JavaScript, you can use the Fetch API with the ReadableStream object. Here's an example:

fetch('https://example.com/api/stream')
  .then(response => {
    const reader = response.body.getReader();
    return new ReadableStream({
      start(controller) {
        function push() {
          reader.read().then(({ done, value }) => {
            if (done) {
              controller.close();
              return;
            }
            controller.enqueue(value);
            push();
          });
        }
        push();
      }
    });
  })
  .then(stream => {
    const decoder = new TextDecoder();
    const reader = stream.getReader();
    return new Promise((resolve, reject) => {
      let data = '';
      function read() {
        reader.read().then(({ done, value }) => {
          if (done) {
            resolve(data);
            return;
          }
          data += decoder.decode(value);
          read();
        }).catch(reject);
      }
      read();
    });
  })
  .then(data => {
    console.log(data); // Do something with the stream data
  })
  .catch(error => {
    console.error(error); // Handle errors
  });

This code sends a GET request to an API endpoint that returns a stream of data. It then reads the stream using a ReadableStream object and concatenates the data into a string using a TextDecoder object. Finally, it logs the data to the console. Note that this code is for demonstration purposes only and may need to be adapted to your specific use case.