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Yoast SEO

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Welcome to the Yoast SEO GitHub repository

While the documentation for the Yoast SEO plugin can be found on, here you can browse the source of the project, find and discuss open issues and even contribute yourself.


Here's a guide on how to install Yoast SEO in your WordPress site.

Want to contribute to Yoast SEO?


At Yoast, we make use a specific toolset to develop our code. Please ensure you have the following tools installed before contributing.

Getting started

After installing the aforementioned tools, you can use the steps below to acquire a development version of Yoast SEO. Please note that this will download the latest development version of Yoast SEO. While this version is usually stable, it is not recommended for use in a production environment.

Within your WordPress installation, navigate to wp-content/plugins and run the following commands:

git clone
cd wordpress-seo

To install all the necessary dependencies, run the following commands:

composer install
grunt build

During development, you could run grunt build:dev instead of grunt build, to save yourself downloading some dependencies that are only needed for a production environment.

Please note that if you change anything in the JavaScript or CSS, you'll have to run grunt build:js or grunt build:css, respectively.

For active development, you could run grunt watch to keep the build up-to-date and run checks right away.

For JavaScript only, a webpack development server is available. To enable the dev-server, you'll have to add this to your WordPress install's config.php:

define( 'YOAST_SEO_DEV_SERVER', true );

and you can start it by running yarn start in the wordpress-seo folder.

Another JavaScript alternative is grunt webpack:watch, this command will keep the JS files up-to-date. You'll have to refresh the page yourself since this does not run a development server.

This repository uses the Yoast grunt tasks plugin.

Testing packages

To run tests for js packages, run the following command from packages/js folder:

yarn test


This is a developer's portal for Yoast SEO and should not be used for support. Please visit the support forums.

Reporting bugs

If you find an issue, let us know here! Please follow these guidelines on how to write a good bug report.

It may help us a lot if you can provide a backtrace of the error encountered. You can use code in this gist to enable the backtrace in your website's configuration.


Anyone is welcome to contribute to Yoast SEO. Please read the guidelines for contributing to this repository.

There are various ways you can contribute: