# How to validate BSN, PGN & OWN in the Netherlands with TypeScript/JavaScript

The BSN, PGN and OWN in the Netherlands can be validated with a 11 proef (elf proef). In this post I show you the JavaScript and TypeScript code.

In the Netherlands, we have a few identification numbers from the government. In this example, you can create a function to validate both of them [based on the specification](https://developers.wiki.kennisnet.nl/index.php?title=OSO:2022/beveiliging/versleuteling_bsn).

- BSN = Burgerservice nummer
- PGN = Burgerservice nummer in schools where the student doesn't have a BSN. The PGN is also called OWN.

![divider-byrayray.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1629890886208/NhHYvPmBA.png)

## How to use the code?

Define the function in your code and call it like this:

### TypeScript example
```typescript
// PGN/OWN
elfProefValidation('114435231', ElfproefType.own); // returns true;
elfProefValidation('34564366349', ElfproefType.own); // returns false;
// BSN
elfProefValidation('232262536', ElfproefType.bsn); // returns true;
elfProefValidation('247594057', ElfproefType.bsn); // returns false;
```

### JavaScript example
```javascript
// PGN/OWN
elfProefValidation('114435231', 'own'); // returns true;
elfProefValidation('34564366349', 'own')); // returns false;
// BSN
elfProefValidation('232262536', 'bsn')); // returns true;
elfProefValidation('247594057', 'bsn')); // returns false;
```

### Working version
I created a working version on  [RunKit](https://runkit.com/devbyrayray/elfproef) . *Make sure you select Node version 17.*

%[https://runkit.com/devbyrayray/elfproef]



## Code

%[https://gist.github.com/devbyray/cc491f00a2f7630b323e80c0df828d3a#file-elfproef-validation-js]

![divider-byrayray.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1629890886208/NhHYvPmBA.png)

## Thanks!
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