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From https://en.coronasmitte.dk/rules-and-regulations/entry-into-denmark/categorization-of-countries
If you live in Netherlands, that is an orange country (yes I know, but now also according to the Danish classification) you need:
The tests could be PCR or quick antigen tests.
The test after arrival is free. You can find a list of testing sites at https://en.coronasmitte.dk/rules-and-regulations/entry-into-denmark/legal-requirements-upon-entry/new-mandatory-testing-and-isolation-requirements# under the heading "Where can one be tested?"
All requirements are void if you are fully vaccinated more than two weeks ago or was previously infected.
Note that the country classifications can change every week.