--- title: slog.GroupAttrs | daily.dev description: Covers the difference between slog.Group and slog.GroupAttrs in Go's structured logging package, noting that GroupAttrs is more efficient but only accepts... canonical: https://daily.dev/posts/slog-groupattrs-cmhm9xwg4 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: slog.GroupAttrs | daily.dev og:description: Covers the difference between slog.Group and slog.GroupAttrs in Go's structured logging package, noting that GroupAttrs is more efficient but only accepts... og:url: https://daily.dev/posts/slog-groupattrs-cmhm9xwg4 og:image: https://api.daily.dev/og/posts/CmhM9xwG4.png og:image:alt: slog.GroupAttrs 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. # slog.GroupAttrs **[Boldly Go](https://daily.dev/sources/boldlygo)** · 2 min read · 16 upvotes · 2 comments ## Summary Covers the difference between slog.Group and slog.GroupAttrs in Go's structured logging package, noting that GroupAttrs is more efficient but only accepts slog.Attr values with no mixed form. Provides a practical toAttrs helper function that replicates slog's internal logic for converting variadic any arguments (including both string key/value pairs and slog.Attr values) into a []slog.Attr slice, useful when building custom slog wrapper utilities. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is the difference between slog.Group and slog.GroupAttrs in Go? slog.Group accepts variadic any arguments as key/value pairs, while slog.GroupAttrs accepts only slog.Attr values and is a more efficient version of Group. Neither function offers a mixed form that accepts both any pairs and Attr values together, unlike slog.Info which does support mixing the two argument styles. _Developers wiring up structured logging in Go can keep slog api nuances like this handy on daily.dev._ ### How can I write a custom slog wrapper in Go that accepts both any key/value pairs and slog.Attr values like slog.Info does? The slog package does not export the internal logic it uses to convert mixed any and Attr arguments, so you must reimplement it yourself. A toAttrs function can loop through args, appending slog.Attr values directly, treating strings as keys paired with the next value via slog.Any, and falling back to a BADKEY attr for malformed input. _Track practical Go logging patterns like custom slog wrappers on daily.dev while building your own tooling._ ## Community discussion Top comments from developers on daily.dev. **@jenueldev** · 0 upvotes > A wrapper that converts Group's mixed ...any form into []slog.Attr is useful, but that helper effectively becomes part of the logging API contract. Table tests for dangling keys, non-string keys, and prebuilt Attr values would help ensure its behavior stays aligned with slog's normalization across Go releases. ## Similar posts on daily.dev - [slog.Group](https://daily.dev/posts/slog-group-jgispqf2d) · Boldly Go · 7 upvotes · 1 comments - [slog.Group](https://daily.dev/posts/slog-group-olh3jgzix) · Boldly Go · 10 upvotes · 1 comments - [The Attr type](https://daily.dev/posts/the-attr-type-udhsolgm5) · Boldly Go · 19 upvotes · 0 comments - [slog.Handler.WithAttrs](https://daily.dev/posts/slog-handler-withattrs-l2fs9cp1u) · Boldly Go · 29 upvotes · 1 comments - [slog.Handler.WithGroup](https://daily.dev/posts/slog-handler-withgroup-uccfkac85) · Boldly Go · 4 upvotes · 0 comments --- Tags: [#golang](https://daily.dev/tags/golang), [#logging](https://daily.dev/tags/logging) [View this post on daily.dev](https://daily.dev/posts/slog-groupattrs-cmhm9xwg4) ```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":"slog.GroupAttrs","url":"https://daily.dev/posts/slog-groupattrs-cmhm9xwg4","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/slog-groupattrs-cmhm9xwg4"},"datePublished":"2026-07-14T13:30:40.176Z","dateModified":"2026-09-14T09:15:42.604Z","description":"Covers the difference between slog.Group and slog.GroupAttrs in Go's structured logging package, noting that GroupAttrs is more efficient but only accepts...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/a34bbf94f7c8bcbf828174d099f2faa8?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/a34bbf94f7c8bcbf828174d099f2faa8?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Boldly Go","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":"Boldly Go","logo":"https://media.daily.dev/image/upload/s--0HXlQZhy--/f_auto,q_auto/v1780213594/logos/boldlygo?_a=BAMAMiWQ0","url":"https://daily.dev/sources/boldlygo"},"commentCount":2,"discussionUrl":"https://daily.dev/posts/slog-groupattrs-cmhm9xwg4","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":16},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":2}],"keywords":"golang,logging","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Boldly Go","item":"https://daily.dev/sources/boldlygo"},{"@type":"ListItem","position":3,"name":"slog.GroupAttrs"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/slog-groupattrs-cmhm9xwg4","comment":[{"@type":"Comment","text":"A wrapper that converts Group’s mixed …any form into []slog.Attr is useful, but that helper effectively becomes part of the logging API contract. 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