--- title: How to Build a Custom React Renderer? | daily.dev description: A deep-dive into building a custom React renderer using the react-reconciler package, illustrated through Smelter — a video compositing tool built with a... canonical: https://daily.dev/posts/how-to-build-a-custom-react-renderer--2yz2bhpoc twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How to Build a Custom React Renderer? | daily.dev og:description: A deep-dive into building a custom React renderer using the react-reconciler package, illustrated through Smelter — a video compositing tool built with a... og:url: https://daily.dev/posts/how-to-build-a-custom-react-renderer--2yz2bhpoc og:image: https://api.daily.dev/og/posts/2yz2BHpOc.png og:image:alt: How to Build a Custom React Renderer? 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. # How to Build a Custom React Renderer? **[Software Mansion](https://daily.dev/sources/swmansion)** · 9 min read · 0 upvotes · 0 comments ## Summary A deep-dive into building a custom React renderer using the react-reconciler package, illustrated through Smelter — a video compositing tool built with a Rust-based JSON HTTP API. Covers the two main integration approaches (custom renderer vs. React Native target platform), explains the Persistence mode of react-reconciler, walks through the key HostConfig callbacks (createInstance, cloneInstance, replaceContainerChildren, etc.), and discusses real-world limitations such as network unreliability, frame-accurate updates, and handling offline processing with useEffect timing. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Writing Custom Renderers for React](https://daily.dev/posts/writing-custom-renderers-for-react-tp0cc3d7x) · Callstack Blog · 11 upvotes · 0 comments - [Presentations: A Guide to React Compiler Rendering](https://daily.dev/posts/presentations-a-guide-to-react-compiler-rendering-m8rl5nmj0) · Mark Erikson · 0 upvotes · 0 comments - [How to Optimize React](https://daily.dev/posts/how-to-optimize-react-smu81m6vm) · freeCodeCamp · 7 upvotes · 0 comments - [How React Works Internally: Virtual DOM, Reconciliation, and Rendering](https://daily.dev/posts/how-react-works-internally-virtual-dom-reconciliation-and-rendering-en38kquvn) · Medium · 2 upvotes · 0 comments - [Building The Monolith: Composable Rendering Systems for a 13-Scene WebGL Epic](https://daily.dev/posts/building-the-monolith-composable-rendering-systems-for-a-13-scene-webgl-epic-ujhlkwkk9) · Codrops · 0 upvotes · 0 comments --- Tags: [#react](https://daily.dev/tags/react) [View this post on daily.dev](https://daily.dev/posts/how-to-build-a-custom-react-renderer--2yz2bhpoc) ```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":"How to Build a Custom React Renderer?","url":"https://daily.dev/posts/how-to-build-a-custom-react-renderer--2yz2bhpoc","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-to-build-a-custom-react-renderer--2yz2bhpoc"},"datePublished":"2026-08-02T07:15:56.752Z","dateModified":"2026-08-02T07:42:29.620Z","description":"A deep-dive into building a custom React renderer using the react-reconciler package, illustrated through Smelter — a video compositing tool built with a...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/1c8726b842e2f3c0ded69b3dbf7bf40b?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/1c8726b842e2f3c0ded69b3dbf7bf40b?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Software Mansion","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":"Software Mansion","logo":"https://media.daily.dev/image/upload/s--sOx0vaVZ--/f_auto,q_auto/v1785654908/logos/swmansion?_a=BAMAMicg0","url":"https://daily.dev/sources/swmansion"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/how-to-build-a-custom-react-renderer--2yz2bhpoc","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"react","timeRequired":"PT9M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Software Mansion","item":"https://daily.dev/sources/swmansion"},{"@type":"ListItem","position":3,"name":"How to Build a Custom React Renderer?"}]} ```