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Jonas Hämmerle

Building Validate — a stateless validation API for IBAN, VAT, email, phone, credit card, postal code & password checks. Writing about API design, edge deployment, and pragmatic backend validation.

The complete guide to disposable email detection

The complete guide to disposable email detection

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2 min read

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Why your regex for IBAN validation is probably wrong

Why your regex for IBAN validation is probably wrong

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2 min read
Real-time currency conversion API - no signup required

Real-time currency conversion API - no signup required

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2 min read
How to generate QR codes for free with an API

How to generate QR codes for free with an API

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2 min read
Stop using regex for phone validation - use this instead

Stop using regex for phone validation - use this instead

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2 min read
IBAN validation guide for developers

IBAN validation guide for developers

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2 min read
How to validate email addresses properly in 2026

How to validate email addresses properly in 2026

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2 min read
Validate API changelog: disposable-email detection and postal-code validation

Validate API changelog: disposable-email detection and postal-code validation

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2 min read
Entropy-based password strength scoring (and why 'has a symbol' rules are theater)

Entropy-based password strength scoring (and why 'has a symbol' rules are theater)

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1 min read
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