Blog
Articles, tutorials and news about KVK data and API integrations.
The Easiest KVK API (makkelijke kvk api) for Dutch Developers: KVK nummer opzoeken, BTW nummer validatie en bedrijfsgegevens API Nederland
Discover the makkelijke kvk api by KVKBase — the easiest KVK API for KVK nummer opzoeken, BTW nummer validatie and bedrijfsgegevens API Nederland. Includes KVK lookup API and VIES validation in one simple REST API or embeddable widget.
KVK API in Python: Easy KVK API (makkelijke kvk api) for KVK nummer opzoeken, BTW nummer validatie & bedrijfsgegevens API Nederland
Learn how to use the easy KVK API (makkelijke kvk api) in Python for KVK nummer opzoeken, BTW nummer validatie, and accessing bedrijfsgegevens API Nederland. Step-by-step guide with code examples, VIES validatie API (KVK lookup API), and the KVKBase widget.
SBI Codes Explained: How to Classify Dutch Businesses by Industry
Learn what SBI codes are, how to retrieve them from KVK data, and how to use them for lead filtering, compliance, and market analysis.
Lead Scoring with KVK Data: Qualify Leads Automatically
Learn how to use Dutch Chamber of Commerce data to automatically score and qualify B2B leads. Focus your sales team on the leads that matter most.
How to Look Up Dutch Company Data from Outside the Netherlands
A complete guide to accessing KVK (Chamber of Commerce) data, validating Dutch VAT numbers, and integrating Dutch business data into your international application.
Dutch Business Registration: What Developers Need to Know
Complete overview of the Dutch Trade Register for developers. KVK numbers, legal forms, SBI codes, and branch numbers explained.
ERP Integration with KVK Data: Exact Online, AFAS, and More
Guide to connecting KVK data to ERP systems like Exact Online and AFAS. Field mapping, automated customer creation, and synchronization strategies.
Prefill Dutch Business Details in Checkout Forms
Learn how to automatically fill in company name, address, and VAT number from a KVK number in your checkout or registration form.
Dutch VAT Number Validation: A Developer's Guide to VIES and BTW
How to validate Dutch BTW numbers using the VIES API, common formats, and integration patterns for KYC and invoicing workflows.
How to Auto-Complete Dutch Business Addresses with KVK Data
Build a business address autocomplete using KVK data. Covers debounced search, dropdown UI, field population, and combining with postal code APIs.
Batch Enrichment: Keep Your CRM's Dutch Company Data Up to Date
How to use KVKBase's batch lookup API to enrich and verify Dutch company records in your CRM at scale.
Keeping Company Data Up to Date with Webhooks and Polling
How to keep company data current with polling, cache invalidation, and periodic revalidation. Practical patterns for your application.
B2B E-commerce in the Netherlands: Business Validation at Registration
Why every Dutch B2B web shop needs KVK validation. Fraud prevention, invoicing accuracy, and improving customer registration.
REST API Best Practices for Company Data Lookups
Production-ready patterns for company data APIs: caching, retries, rate limiting, circuit breakers, and response normalization.
KVK Number Validation: Rules, Format, and Common Mistakes
Technical deep-dive into the KVK number format: validation rules, difference from branch numbers, regex patterns, and common programming mistakes.
GDPR Compliance When Using Dutch Business Registry Data
Understand the GDPR implications of using KVK data. Learn the distinction between public business data and personal data, with a practical compliance checklist.
CRM Company Data Enrichment: Automate with KVK Data
Learn how to automatically enrich CRM records with up-to-date KVK data. Integration methods for HubSpot, Salesforce, and Pipedrive.
Building a KVK Number Validation Widget with JavaScript
Step-by-step tutorial for building an embeddable KVK number lookup widget with JavaScript, including event handling, accessibility, and CSS customization.
Checkout Optimization: Auto-Fill Company Data from a KVK Number
Boost your B2B checkout conversion by auto-filling company details from a KVK number. Fewer errors, faster completion, better customer experience.
KVK API vs Government API: Which Should You Choose?
Honest comparison of the official KVK API, OpenKVK, Overheid.io, and KVKBase. Find out which option best fits your project.
How to Integrate a Dutch Company Data API in Your SaaS
Step-by-step guide for integrating KVK company data into your SaaS application, with code examples, error handling, and caching best practices.
VAT Number Validation with VIES: A Programmatic Guide
Learn how to validate Dutch and European VAT numbers using the VIES API. Includes code examples, error handling, and caching strategies.
KVK Number Lookup: The Complete Guide for Developers
Learn how to look up KVK numbers, automate lookups, and integrate Dutch company data into your application. Complete guide with code examples and common pitfalls.