app-metadata | Vaadin

Manage page meta tags for SEO

[ This description is mirrored from at on 2019-05-10 ]

Demo and API docs


app-metadata is a singleton element used to manage page meta-data for Search Engine Optimization (SEO). It will add and remove <meta> elements to the page <head> section based on the JSON object passed to it.

In order to make use of the meta data manager, it is best to request it's availability in the app element.


  is: 'my-app',
  attached: function() {
    // this will create the singleton element if it has not been created yet

After the app-metadata has been made available, elements can update the meta by firing bubbling app-metadata events.

Example:'app-metadata', {
  title: 'This is the page title',
  description: 'This is the page description',
  keywords: 'these,are,keywords'

Alternatively, create an instance of the app-metadata element and set it's data property.


var meta = document.createElement('app-metadata'); = {
  title: 'This is the page title',
  description: 'This is the page description',
  keywords: 'these,are,keywords'


To demonstrate this approach does work I've created a very simple test site using the polymer-cli and added some content with the meta html headers set for each view using this <app-metadata> element.

Here's the meta data set for the main view:'app-metadata', {
    title: 'Why use Agile Project Management?',
    description: 'How Agile Project Management Methodologies help compared to the old Waterfall approach to Project Management',
    keywords: 'scrum, scrum master, agile, training, certification, professional, certified, CSM, PSM'

This view has been successfully indexed by Google and appears correctly in the search results:



Link to this version
ImportedReleased 13 August 2016MIT License
Framework Support
Polymer 1.0+
Browser Independent
Install with
bower install --save CaptainCodeman/app-metadata"#0.0.6"
Run the above Bower command in your project folder. If you have any issues installing, please contact the author.
Release notes - Version 0.0.6


  • polymer#Polymer/polymer#^1.4.0