Blog
Articles, tutorials and news about KVK data and API integrations.
Dutch Legal Entity Types in KVK Data: BV, VOF and Sole Trader Explained for Developers
Understand how to use the rechtsvorm (legal entity type) field from KVK data in your application. Learn the differences between BV, VOF, sole trader and foundation, and why it matters for invoicing, credit risk and KYC.
KVK API with C# and .NET: Querying Dutch Business Data in Your .NET Application
Integrate the KVKBase API into your C# or .NET project. Code examples for HttpClient, dependency injection, error handling and caching — production-ready.
KVK API with Java and Spring Boot: Querying Dutch Business Data in Your Java Application
Integrate the KVKBase API into your Java Spring Boot project. Code examples for RestClient, exception handling, caching and a reusable service class, suited for enterprise Java developers.
Freelancer Verification via the KVK API: Check If a Dutch Contractor Is Registered
Working with Dutch freelancers? Use the KVKBase API to verify KVK registration status before paying invoices or starting contracts — automate compliance in minutes.
KVK API with Go: Querying Dutch Company Data in Golang
Integrate the KVKBase API into your Go project. Includes code examples for HTTP clients, structs, error handling, and a reusable client library — suitable for both beginners and experienced Go developers.
Automating B2B Customer Onboarding with KVK Data
Speed up your B2B onboarding by automatically fetching company details via the KVKBase API. From KVK number to a fully populated customer profile in seconds.
E-Invoicing 2026: How KVK Data Prevents Errors in Your Invoice Workflow
Mandatory e-invoicing is coming for more Dutch businesses. Use KVK data via the KVKBase API to automatically validate invoice details and prevent costly mistakes.
KVK Data for KYC: How to Verify Business Customers Quickly
How to use KVK data in your KYC process. From business identification to UBO verification and Wwft compliance. Includes API examples.
Monitoring Dutch Company Status with the KVK API: Detecting Bankruptcies and Changes
Automatically detect when a customer or supplier goes bankrupt, deregisters, or changes address. Use the KVKBase API to monitor company status in real time and reduce financial risk.
KVK API with PHP and Laravel: Fetch Dutch Company Data in Your Webshop or SaaS
Integrate the KVKBase API into your PHP or Laravel project. Code examples for Guzzle, WooCommerce, and Laravel — including form auto-fill and error handling.
Newly Registered Companies as a Sales Channel: Finding Leads with KVK Data
Learn how to use Dutch Trade Register data to find and qualify B2B leads from newly registered businesses. Filter by industry, legal form, and region.
KVK API with Node.js and TypeScript: The Complete Developer Guide
Integrate the KVKBase API into your Node.js or TypeScript project. Code examples for Express, Next.js, and NestJS — including type definitions and error handling.
KVK API for Webshops: Automated Business Data with the Easiest KVK API
Use the easy KVK API from KVKBase in your webshop for KVK number lookup, VAT number validation and Dutch business data API. Integrate the KVK lookup API and VIES validation API effortlessly.
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.