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Gavin Sykes
Gavin Sykes

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Build a Modern API with Slim 4 - Add your First Route

Now that we have our application up and running, we need to make it actually look our for calls on certain routes, as it stands it won't actually do that as we haven't told it what to look out for.

As mentioned way back in the introduction, we will be creating a bookstore API, so let's first of all create a /books endpoint. This all goes in our src/routes folder:



$app->group('/books', function($app) {
  $app->get('', function($request, $response, $args) {
    // Code will go here
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And in our index file we add, between creating the app and adding the 3 middlewares:

$app = AppFactory::create();

require __DIR__ . '/../src/routes/books.php';

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Wait, so, what have we actually done here? Well firstly we've included our books file in our index, as without that it will never even attempt to run it, then in our books file we've added a group called books, inside which we've added a GET endpoint with an empty endpoint, this has enabled the endpoint. Had we done, say, $app->get('all' ... then it would be

However, this isn't what our final books file will look like. Ideally we want this file to just handle the routing and add any associated middlewares (JSON validation for example which won't be on every route). We need to make use of our controllers directory for this.

Top comments (3)

divinefavour377 profile image

Hello Gavin
I'm a Slim developer, and I was following up on your series. It's really nice and helpful, but it's not complete.

Please will you be completing the series or you are done with it?

gavinsykes profile image
Gavin Sykes

Hi Divine, sorry it's taken so long to come back, things got kind of interrupted and there's even been a lot of changes as to how I plan to complete this series. Thanks for commenting though! It's taken Dev until now to actually show me the comment for some reason.

I do indeed plan to complete it, I just cannot say for certain when or which parts people will want to prioritise.

jgdoncel profile image

Hi there!
Excellent piece. Hope you find time to complete it.