The Copenhagen Book
The Copenhagen Book offers a free, open-source community guide to implementing authentication in web applications.
About The Copenhagen Book
The Copenhagen Book provides a general guideline on implementing authentication in web applications. It notes the material may be opinionated or incomplete at times and recommends using it alongside the OWASP Cheat Sheet Series.
This website has been replaced and is no longer maintained. Visitors are directed to auth.pilcrowonpaper.com.
Key features
- General guideline for implementing auth in web applications
- Recommends companion use with OWASP Cheat Sheet Series
- Directs visitors to replacement site auth.pilcrowonpaper.com
- Accepts suggestions through opening a new issue
Best for: People implementing authentication in web applications who want a general guideline.
Watch out for
- No longer maintained and has been replaced
- May be opinionated or incomplete at times
The Copenhagen Book at a glance
- Website
- thecopenhagenbook.com
- Category
- Education & Learning › Learn to Code
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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The Copenhagen Book FAQ
Is The Copenhagen Book still maintained?
No. The site states it has been replaced and is no longer maintained, and directs visitors to auth.pilcrowonpaper.com.
Should I use The Copenhagen Book on its own?
No. It recommends using the guideline alongside the OWASP Cheat Sheet Series.
How can I share suggestions or concerns?
Consider opening a new issue.
Is something wrong or out of date?
Tell us and an editor will check it.
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