This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The Report interface of the Reporting API represents a single report.

Reports can be accessed in a number of ways:

  • Via the ReportingObserver.takeRecords() method — this returns all reports in an observer's report queue, and then empties the queue.
  • Via the reports parameter of the callback function passed into the ReportingObserver() constructor upon creation of a new observer instance. This contains the list of reports currently contained in the observer's report queue.
  • By sending requests to the endpoints defined via the Report-To HTTP header.


Report.body Read only
The body of the report, which is a ReportBody object containing the detailed report information.
Report.type Read only
The type of report generated, e.g. deprecation or intervention.
Report.url Read only
The URL of the document that generated the report.


This interface has no methods defined on it.


This interface has no events that fire on it.


In our deprecation_report.html example, we create a simple reporting observer to observe usage of deprecated features on our web page:

let options = {
  types: ['deprecation'],
  buffered: true

let observer = new ReportingObserver(function(reports, observer) {
  reportBtn.onclick = () => displayReports(reports);
}, options);

We then tell it to start observing reports using ReportingObserver.observe(); this tells the observer to start collecting reports in its report queue, and runs the callback function specified inside the constructor:


Because of the event handler we set up inside the ReportingObserver() constructor, we can now click the button to display the report details.

image of a jolly bearded man with various stats displayed below it about a deprecated feature

The report details are displayed via the displayReports() fuction, which takes the observer callback's reports parameter as its parameter:

function displayReports(reports) {
  const outputElem = document.querySelector('.output');
  const list = document.createElement('ul');

  for(let i = 0; i < reports.length; i++) {
    let listItem = document.createElement('li');
    let textNode = document.createTextNode('Report ' + (i + 1) + ', type: ' + reports[i].type);
    let innerList = document.createElement('ul');

    for (let key in reports[i].body) {
      let innerListItem = document.createElement('li');
      let keyValue = reports[i].body[key];
      innerListItem.textContent = key + ': ' + keyValue;

The reports parameter contains an array of all the reports in the observer's report queue. We loop over each report using a basic for loop, then iterate over each entry of in the report's body using a structure, displaying each key/value pair inside a list item.


Specification Status Comment
Reporting API
The definition of 'Report' in that specification.
Editor's Draft

Browser compatibility

No compatibility data found. Please contribute data for "api.Report" (depth: 1) to the MDN compatibility data repository.

See also