JSON Web Tokens are often times used for authentication delegation from one system to another. They can be decoded for debugging purposes. While most tooling supports decoding base64, JWTs are...
...of type Base64url, which is slightly different and needs to be accounted for. This assumes you already have the JWT in hand, e.g. after scraping it out of an HTTP...
...life as web developers we are constantly faced with technical problems that can be solved with a variety of (sometimes vastly different) technologies. Choosing the right tool for the tasks...
...is crucial for our mid- and long term success. Our technology radar card documents what we're currently investigating either to replace or introduce to our stack of tools. Start...
...Chrome to check if the problem disappears. Keep in mind though that running outdated software, especially web browsers, is in most cases not a good idea. Please verify periodically if...
...you still need to run the old version or if an even more recently updated version fixes the problems introduced in your version. Here's how to get old versions...
Detecting if a Javascript is running under Selenium WebDriver is super-painful. It's much easier to detect the current Rails environment instead. You might be better of checking against...
...the name of the current Rails environment. To do this, store the environment name in a data-environment of your . E.g., in your application layout: <html data-environment=<%= Rails.env %>>
...Before merging back: reinstate reverted features in a temporary branch, then merge that branch. Scenario Consider your team has been working on several features in a branch, made many changes...
...fix them, if necessary. Maybe tests were added that expect the removed functionality as a side-effect. Merge the master into your branch regularly, especially when you have multiple teams...
tl;dr When browsers start to adapt proposals from Open UI, it might not be necessary to use any 3rd party libraries to have nice components and controls in web...
...applications e.g. selects. It would require only a minimum of CSS and Javascript to get them working and looking good. The purpose of the Open UI, a W3C Community Group...
Sometimes the need arises for SSL in local development. We have guides for different webservers, this one is for puma. make sure mkcert is installed create an SSL certificate for...
...bundle exec rails s Accept the certificate in your browser See also Creating a self-signed certificate for local HTTPS development
...window manager that provides neat features like automatic layouting of windows, good multi-display support with per display workspaces and more. Since it is only a window manager, you will...
...menus, automatic updates etc. Fortunately, you can run Awesome within MATE, by following these steps (tested on Ubuntu MATE 16.04): Awesome + MATE Create the following file at /usr/share/xsessions/Xsession.desktop: [Desktop Entry...
...type of network card is used for a given network interface on a linux system, e.g. because the system has multiple network cards, try and match the driver to the...
...interface name: $ ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback...
Canonical does not ship Ubuntu 24.04+ Vagrant images due to HashiCorps switch to the Business Source License (BSL). There is currently no open source fork of Vagrant. Alternatives
...cloud-image/ubuntu-24.04 which can be used. Caveats The images are unmodified but unofficial. Sharing via the /vagrant folder is not possible. Use SSH/SFTP instead...
...git rebase -i main. What it does: Opens an interactive rebase UI to choose squash/edit/fixup for each commit of your branch until the first commit (the base). Keeps your branch...
...s base intact (no rebasing onto main). Lets you squash, reorder, edit, or drop commits. Info This is not the same as git rebase -i main, which would rebase your...
To set a cookie in your test browser for cucumber tests, you need to know which driver you are using. Use the step below according to your driver.
...to "([^\"]+)"$/ do |key, value| headers = {} Rack::Utils.set_cookie_header!(headers, key, value) cookie_string = headers['Set-Cookie'] Capybara.current_session.driver.browser.set_cookie(cookie_string) end Note that Rack::Utils is only used to...
Select2 is a fantastic library for advanced dropdown boxes, but it depends on jQuery. Alternatives Tom Select There is a selectize.js fork called Tom Select. It is well tested, comes...
...with Bootstrap 3, Bootstrap 4 and Bootstrap 5 styles and is easy to use. You might miss some advanced features. Known issues: Dynamic opt-groups in AJAX requests are not...
...function can be a new instance method of all arrays (by patching Array.prototype) or a stand-alone function that takes an array argument. Write a JavaScript function mySelect that works...
...function can be a new instance method of all arrays (by patching Array.prototype) or a stand-alone function that takes an array argument. Did you learn how this works?
...ae]y => grey or gray => but NOT graay or graey [0-9] matches a SINGLE digit in the range from 0 to 9 [0-9a-fA-F] hexadecimal digit...
...with caution. Mostly you'll want to use it for small expressions, e.g. for nested sub-regexes. For more details have a look at the card on quantifier modes.
...a RubyMine plugin that enables you to review and process merge requests within RubyMine! Setup Open RubyMine settings (Ctrl + Alt + S) > Plugins > Search for "GitLab" > Install (You might need to...
...re-open settings afterwards.) In the RubyMine settings > Version Control > GitLab > Connect your GitLab account with "+" Working with merge requests From the Actions menu (Ctrl + Shift + A), choose "View merge...
Somewhat regularly, you will need to filter a list down to some items and then map them to another value. You can of course chain map and compact, or select/filter...
...if i.even? }.compact => [4, 8, 12] or >> [1, 2, 3, 4, 5, 6].select(&:even?).map { |i| i * 2 } => [4, 8, 12] you can just do...
When you have string contents (e.g. a generated binary stream, or data from a remote source) that you want to store as a file using Carrierwave, here is a simple...
While you could write your string to a file and pass that file to Carrierwave, why even bother? You already have your string (or stream). However, a plain StringIO...
Native promises have no methods to inspect their state. You can use the promiseState function below to check whether a promise is fulfilled, rejected or still pending: promiseState(promise, function...
// `state` now either "pending", "fulfilled" or "rejected" }); Note that the callback passed to promiseState will be called asynchronously in the next microtask. Usage example: Tests Note Since this card...
...browser's HTTPS handling works as expected (which might be compromised e.g. due to security products or enterprise proxy servers...
Starting Terminator with split screens is quite simple: Just store a layout and start Terminator with the --layout option. However, if you want to run custom commands in your terminals...
...command exits. You accomplish this by tweaking bash to run a command before actually starting. Pimp your .bashrc Add this to the end of .bashrc: # hack to keep a bash...
Git log offers useful options for filtering. This card provides a short overview. By message Only commits that include a specific string in their commit message git log --grep="tracker...
By file Only commits that introduced changes to a specific file git log -- foo.rb bar.rb Note In case the file was renamed or moved the --follow option can be...
...to run JS tests. Given a Vue project that uses Jest (via vue-cli-service) with the following package.json: { "scripts": { "test": "vue-cli-service test:unit --testMatch='**/tests/**/*.test.js' --watch...
...allows us to run Jest tests with yarn test. The only downside of this setup is that debugger statements are ignored with the CLI approach - there are no Browser Devtools...
Git is our version control system. Goals Understand why we use git. Learn how to work with your local repository: Create a local repository (git init) Commit changes (git add...
See the history (git log) See changes (git diff) Work with branches Create new ones: git switch --create or git checkout -b. Switch to existing branches: git switch...