Postcode API

Implementation

The Postcode API uses the REST and JSON standards for communication.

Reference implementation

We provide a reference client implementation for PHP. This client implements authentication, error handling and caching.

Caching

Our APIs use the Cache-Control HTTP header to indicate how long the result of a call may be cached. We recommend implementing caching of retrieved results based on this header to improve the speed and efficiency of your application. Reducing the number of calls to our service may also keep your subscription costs down.

Forward compatibility

We will take care never to break existing fields or behavior without warning. Please note that we reserve the right to add new fields to responses in the future, so your client should ignore future unknown fields at any depth in the response.

Authentication

HTTP Basic authentication is used, with the values of your applications Key and Secret used as username and password, respectively. You can obtain a Key and Secret by registering an application account.

Parameters

Parameter values are added to the method URL according to the documented method URL template, and each parameter must be URL-encoded.

Template:

https://api.postcode.eu/nl/v1/addresses/postcode/{postcode}/{houseNumber}/{houseNumberAddition}

Parameters (URL-encoded):

https://api.postcode.eu/nl/v1/addresses/postcode/3024AN/212/E%20K001