Headers: keys() method

The Headers.keys() method returns an iterator allowing to go through all keys contained in this object. The keys are String objects.

Note: This feature is available in Web Workers

Syntax

js
keys()

Parameters

None.

Return value

Returns an iterator.

Examples

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

// Display the keys
for (const key of myHeaders.keys()) {
  console.log(key);
}

The result is:

content-type
vary

Browser compatibility

BCD tables only load in the browser

See also