Guides
Short explanations for anyone building with data about Dutch companies.
Getting the company domain from an email address
From [email protected] to voorbeeld.nl, and why you skip gmail.com and ziggo.nl. With a function you can copy as is.
KVK number, branch number and RSIN
Three numbers from the Dutch Business Register, and when to store which. Plus how to store a KVK number without losing digits.
Storing unknown: why null is not 0
Yes, no and we don't know are three answers. How to store them in your database and your code, so unknown does not quietly turn into no.
What's new
New fields and other changes to the API and the app are in the changelog.