Speed Up Your Grails / Spring Security Development With an Auto Login Bookmarklet

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When you’re doing dev on your website, how often do you log in with the same username and password? I bet it’s 20+ of times a day when you’re actively developing.

Having to log in manually impedes development speed.

If you watch what your browser is doing when it’s interacting with a Spring Security application, you’ll see that (by default) it’s POSTing 2 parameters (j_username and j_password) to http://localhost:8080/YOURAPP/j_spring_security_check.

It’s easy to automate the login process with a little bit of vanilla javascript. Edit this javascript url to replace YOURAPP, YOURUSERNAME, and YOURPASSWORD, then make a bookmark out of it in your browser:


Any time you want to log in, just click that bookmark. You’re now fully authenticated and in the app without having to interact with the login page.

Alternatively, if you’re using Google Chrome (or Firefox), you can create a “search engine” associated with a user-defined keyword. Type the keyword in the address bar to launch it.

You can even parameterize it to log in as a variety of users.

Say that you’ve got a number of different test users in your app: “admin”, “joeuser”, “sales”, “finance”, etc. All of the test users have the same password, but different usernames with different roles. If you make the username in the javascript url a “%s”, Chrome will replace that “%s” with your “search term”.

So if your app is “superapp” and all passwords are “password”, you can use this to create a Chrome search engine that lets you login with whatever test user you want


To set it up, go into your preferences (cmd-,) and press the “Manage Search Engines” button.

Then under “Other Search Engines” click in the box to “Add a new search engine”

Name it with your app’s name (“superapp login”), set the keyword to an abbreviation of your app’s name (“sa”), and set the url to the edited javascript command to log in with your app’s url/username/password (potentially with the username as “%s” to parameterize it).

Once you save it, you can then go to your browser’s address bar (cmd-L) and type your abbreviation (“sa”) to get a new “search engine”. Then enter the username you want to log in as.

Hit enter and you’ll automatically be logged in to your app, without having to interact with your normal login page.

Automating this can help to keep you in the zone, especially if you’re using a security framework that allows deep linking.

If deep linking is enabled, the quickest way to get back to the page you’re iterating on after your session has expired (or you’ve bounced the app) is to reload the page. As it’s redirecting you to the login page, go to your address bar (cmd-L), type your keyword (ex: “sa”) and any associated username (ex: “admin”) and hit enter. You’ll be logged in before the login page displays and Spring Security will redirect you back to the page you originally requested.