Use Case -- No Code

Add a Dutch Company Lookup to Any Website -- No Code Required

Drop a single script tag into your website and give visitors the ability to look up Dutch companies by KVK number. Works with Shopify, WordPress, Webflow, and any HTML page.

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The Problem

You need a company lookup but do not have developer resources

Many businesses need Dutch company data on their website -- for checkout forms, registration pages, or contact forms -- but do not have the engineering team to build an API integration. Agencies building client websites, Shopify merchants adding B2B checkout, and small businesses creating registration forms all face the same challenge.

Traditional API integrations require backend code, API key management, error handling, and ongoing maintenance. That is overkill when all you need is a simple form field that looks up a company when someone enters a KVK number.

Existing solutions either require coding knowledge or come with heavy JavaScript frameworks that slow down your site. What you need is something that works like adding a YouTube embed: paste a snippet, and it works.

The Solution

One script tag, instant company lookup

The KVKBase widget is a single script tag that adds Dutch company lookup to any website. It connects to your existing form fields using CSS selectors, and when a user enters a KVK number, it automatically fills in company name, address, and VAT number. No backend, no API keys in your frontend code, no JavaScript to write.

HTML -- The Complete Integration 
<!-- That's it. Add this before </body> -->
<script
  src="https://widget.kvkbase.nl/embed.js"
  data-field-kvk="#kvk-number"
  data-field-name="#company-name"
  data-field-address="#address"
  data-field-city="#city"
  data-field-postcode="#postal-code"
  data-field-vat="#vat-number"
  data-theme="auto"
></script>

The widget works by mapping KVK data to your existing form fields. Point it at your input fields using CSS selectors (IDs, classes, or data attributes), and the widget handles the rest. It detects when a user enters a valid KVK number, calls the KVKBase API, and populates the mapped fields with company data.

The data-theme="auto" attribute automatically matches your website's light or dark mode. You can also set it to "light" or "dark" explicitly, or customize the styling with CSS variables to match your brand.

HTML -- Example Form with Widget 
<form>
  <label>KVK Number</label>
  <input type="text" id="kvk-number" placeholder="Enter KVK number" />

  <label>Company Name</label>
  <input type="text" id="company-name" readonly />

  <label>Address</label>
  <input type="text" id="address" readonly />

  <label>City</label>
  <input type="text" id="city" readonly />

  <label>Postal Code</label>
  <input type="text" id="postal-code" readonly />

  <label>VAT Number</label>
  <input type="text" id="vat-number" readonly />

  <button type="submit">Submit</button>
</form>

<script src="https://widget.kvkbase.nl/embed.js"
  data-field-kvk="#kvk-number"
  data-field-name="#company-name"
  data-field-address="#address"
  data-field-city="#city"
  data-field-postcode="#postal-code"
  data-field-vat="#vat-number"
></script>
Benefits

Why non-technical teams choose the KVKBase widget

Zero coding required

Copy one script tag into your HTML. No JavaScript, no backend, no API keys to manage. If you can paste a Google Analytics snippet, you can add KVKBase.

Works everywhere

Compatible with Shopify, WordPress, Webflow, Squarespace, Wix, and any platform that lets you add custom HTML. Works with any form builder.

Automatic theming

The widget detects your site's color scheme and adapts. Light mode, dark mode, or custom -- it blends in without any CSS work on your part.

Lightweight and fast

The widget script is under 10KB. It loads asynchronously and does not block your page rendering. No impact on your site speed or Core Web Vitals.

How It Works

Three steps to add company lookup to your site

1

Add form fields

Create input fields for KVK number, company name, address, and other details. Give each field an ID or class that the widget can target.

2

Paste the script tag

Add the KVKBase widget script before your closing body tag. Set the data attributes to match your form field selectors.

3

Done

Visitors enter a KVK number and company details fill in automatically. No deployment, no build step, no server configuration.

Add Dutch company lookup in five minutes

Start with 100 free lookups per month. No credit card required. No coding skills needed.

Get started free