To see the value of a variable, use the 11ty log filter which calls console.log. This writes to the terminal window where the Eleventy server is running, not to the DevTools console.

For example:

{% set temp = myVariable | log %}

TODO: Do you have to use an assignment in order to TODO: avoid rendering something to the browser?

To render the content of an array or object within a page, use the Nunjucks dump filter which calls JSON.stringify.

For example:

{{ myVariable | dump }}