--- title: The Copenhagen Book | daily.dev description: The Copenhagen Book is a free, open-source guideline for implementing authentication in web applications. It recommends using it alongside the OWASP Cheat... canonical: https://daily.dev/posts/the-copenhagen-book-jamhcnogw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The Copenhagen Book | daily.dev og:description: The Copenhagen Book is a free, open-source guideline for implementing authentication in web applications. It recommends using it alongside the OWASP Cheat... og:url: https://daily.dev/posts/the-copenhagen-book-jamhcnogw og:image: https://api.daily.dev/og/posts/jAMhcNoGW.png og:image:alt: The Copenhagen Book og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The Copenhagen Book **[Community Picks](https://daily.dev/sources/community)** · 1 min read · 17 upvotes · 0 comments ## Summary The Copenhagen Book is a free, open-source guideline for implementing authentication in web applications. It recommends using it alongside the OWASP Cheat Sheet Series. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#security](https://daily.dev/tags/security), [#webdev](https://daily.dev/tags/webdev), [#authentication](https://daily.dev/tags/authentication) [View this post on daily.dev](https://daily.dev/posts/the-copenhagen-book-jamhcnogw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"The Copenhagen Book","url":"https://daily.dev/posts/the-copenhagen-book-jamhcnogw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/the-copenhagen-book-jamhcnogw"},"datePublished":"2024-05-31T08:49:17.878Z","dateModified":"2024-08-23T14:36:33.069Z","description":"The Copenhagen Book is a free, open-source guideline for implementing authentication in web applications. It recommends using it alongside the OWASP Cheat...","image":"https://media.daily.dev/image/upload/s--ZrL_HSsR--/f_auto/v1722860399/public/Placeholder%2006","thumbnailUrl":"https://media.daily.dev/image/upload/s--ZrL_HSsR--/f_auto/v1722860399/public/Placeholder%2006","isAccessibleForFree":true,"articleSection":"Community Picks","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Community Picks","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1655817725/logos/community","url":"https://daily.dev/sources/community"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/the-copenhagen-book-jamhcnogw","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":17},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,webdev,authentication","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Community Picks","item":"https://daily.dev/sources/community"},{"@type":"ListItem","position":3,"name":"The Copenhagen Book"}]} ```