This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

The Headers.entries() method returns an iterator allowing to go through all key/value pairs contained in this object. The both the key and value of each pairs are ByteString objects.

Note: This method is available in Web Workers.



Return value

Returns an iterator.


// Create a test Headers object
var myHeaders = new Headers();
myHeaders.append('Content-Type', 'text/xml');
myHeaders.append('Vary', 'Accept-Language');

// Display the key/value pairs
for (var pair of myHeaders.entries()) {
   console.log(pair[0]+ ': '+ pair[1]);

The result is:

content-type: text/xml
vary: Accept-Language


Specification Status Comment
The definition of 'Headers.entries() (as iterator<>)' in that specification.
Living Standard Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 44 (44) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? 44.0 (44) (Yes) ? ? ?

See also

Document Tags and Contributors

 Contributors to this page: teoli
 Last updated by: teoli,