How to wait for page to load in Cypress

March 15th, 2023
| v10.0.0
5 min read
How to wait for page to load in Cypress

Cypress test can be pretty fast. Sometimes even faster than the application we are testing. If you find yourself in a situation where Cypress runs faster than you application loads, this blogpost is for you.

Page load event

If you found this post via Google search, you might have started your search, because you saw a message that says: "Timed out after waiting 60000ms for your remote page to load."

Page timeout error in Cypress

This message appears when your page does not trigger the load event. But what actually is that?

According to MDN docs, load event is something that your browser triggers once has downloaded all page assets.

So what does that mean?

Whenever you enter an URL into your browser and hit enter, your browser is going to make a GET api call to that address. Similarly to when you do API testing with Postman or with Cypress. Instead of getting a JSON-structured object, you are going to get an HTML document.

A simplified version of the document that is return will look like this:

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Browser will take a look into the document and will request all files linked to it. Notice we have style.css and app.js files. Browser will download them and once it’s done with this, it will trigger the load event that Cypress waits for.

This is pretty much the best point at which we can say that application is ready. Realistically, many sites have dynamic .js files that starts calling APIs that load resources from a server, or animate elements on page. These may cause the application to still be in "loading" mode. There’s no telling how many resources these .js files will load or how long it will take to load them. While the load event is a good checkpoint, in case of modern web applications, it is rarely last thing that happens on a page.

If you see an error that Cypress could not load your page, chances are that this download is not happening, or something is blocking it. This may be an issue on your side, so you can treat this as a bug that needs to be fixed.

I recently saw the mentioned error happen on demo site from Sauce labs. The reason for this problem was how service worker was configured. It caused the load event to never happen. This is not a problem with all service workers, but it caused some trouble for me. The final solution was to stub the service worker API call, essentially disabling the service worker. I added the following intercept and restarted the browser.

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Waiting for network calls

Another way of ensuring that a page is loaded is to wait for a network call. For example, when you have a to-do app that will load all the to-dos when it’s opened, you can use a network call intercept that will wait for that network call to happen:

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Since cy.wait() will wait for not only the request to happen, but also the response, it can be a reliable way of making sure that your page is properly loaded.

If you have multiple API calls, you can intercept them all and make your test wait for them by passing an array of aliases to cy.wait() command like this:

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Another way of waiting for multiple requests is to use cy.get('@alias.all') syntax. This way you can wait for all requests to happen.

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There are two small gotchas though. cy.get() will wait only for 4000 ms for the request to happen, as it listens to defaultCommandTimeout option instead of responseTimeout as it does with cy.wait(). If your requests take longer to load, you need to change the timeout on cy.get() command. Also, cy.get() will only wait for the request to trigger, but will not actually wait for the response. Cypress’ built-in retry-ability can help us though, because we can check the last request status code by referencing the last request:

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Waiting for DOM

Another way of making sure that the application is fully loaded is to take a look into the DOM. This way we can actually assure that we don’t end up doing something we would not expect from a real user.

For example, in real world you would probably not interact with an app while there’s still a "loading" animation still overlaid on page. You can add a guard for your test to make sure the loader disappears before you interact with the page.

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Negative assertions can be a little tricky, and depending on the page speed or way of how the .loader animator works, we might want to add .should('be.visible') before we assert on the element’s non-existence.

To flip this, we can instead just use cy.get() for the element we want to first interact with. If that takes longer time to appear, a timeout can be added. You can read more about timeouts and waiting in one of my previous blogposts.

Default timeout

Sometimes, keeping things simple is the best wait. Every cy.visit() will wait for 60 seconds for the load event to be fired. This is quite a long time, since real users usually don’t have such patience. If the cy.visit() command fails, you should probably fix the application itself and use this timeout as a performance benchmark. Alternatively, you can lower the timeout by changing the pageLoadTimeout option in your configuration. Read about different timeouts in Cypress docs.


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