XMLHttpRequest: responseText property
Note: This feature is available in Web Workers, except for Service Workers.
  The read-only XMLHttpRequest property
  responseText returns the text received from a server
  following a request being sent.
Value
  A string which contains either the textual data received using the
  XMLHttpRequest or "" if the request failed or if no content has been received yet.
  While handling an asynchronous request, the value of responseText always
  has the current content received from the server, even if it's incomplete because the
  data has not been completely received yet.
  You know the entire content has been received when the value of
  readyState becomes
  XMLHttpRequest.DONE (4), and
  status becomes 200 ("OK").
Exceptions
- InvalidStateError- DOMException
- 
    Thrown if the XMLHttpRequest.responseTypeis not set to either the empty string or"text". Since theresponseTextproperty is only valid for text content, any other value is an error condition.
Examples
const xhr = new XMLHttpRequest();
xhr.open("GET", "/server", true);
// If specified, responseType must be empty string or "text"
xhr.responseType = "text";
xhr.onload = () => {
  if (xhr.readyState === xhr.DONE) {
    if (xhr.status === 200) {
      console.log(xhr.response);
      console.log(xhr.responseText);
    }
  }
};
xhr.send(null);
Specifications
| Specification | 
|---|
| XMLHttpRequest Standard # the-responsetext-attribute | 
Browser compatibility
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