https://www.pistack.xyz/tags/struct-mapping/ Recent content in Struct-Mapping on Pi Stack Hugo en-us Thu, 13 Aug 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-08-13-go-struct-mapping-libraries-mapstructure-mergo-copier/ Thu, 13 Aug 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-08-13-go-struct-mapping-libraries-mapstructure-mergo-copier/ <p>Every Go developer has written the same two loops a hundred times: the one that decodes a <code>map[string]interface{}</code> into a typed struct field by field, and the one that copies fields from one struct to another. Both are boring, repetitive, and a reliable source of subtle bugs — and both have battle-tested open-source solutions that most teams still reimplement by hand. <strong>mapstructure</strong>, <strong>mergo</strong>, and <strong>copier</strong> are the three libraries that eliminate this boilerplate, and they solve <em>different</em> problems. Here is when to reach for each.</p>