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Articles

Articles for developers, by developers

Technical insights from building React and React Native production-grade apps, contributing to core libraries, and solving complex cross-platform challenges.

React Native
7/17/2025

Build and Run Node-API Modules in React Native

Node-API allows you to write native modules that run not only in React Native but also in other JavaScript runtimes like Node.js. In this deep dive, we'll guide you through creating a simple Node-API module, testing it in Node.js, getting it up and running in React Native, and finally, publishing it to npm for wider use.

Jamie Birch

Engineer

@

Scoville, NativeScript TSC

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AI
7/14/2025

On-Device Apple LLM Support Comes to React Native

Apple’s on-device LLM is now available in React Native, enabling developers to build private, fast, and offline AI features powered by Foundation Models. This preview release supports text generation, streaming, structured outputs, and first-class support for Vercel AI SDK. A stable version is planned for release alongside iOS 26 later this fall.

Mike Grabowski

CTO

@

Callstack

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React Native
7/10/2025

Announcing Node-API Support for React Native

Node-API brings a stable, cross-platform system for building native modules in React Native, enabling faster builds, easier maintenance, and broader language support. Already widely used in Node.js, Deno, and Bun, it allows native code to interface with JavaScript in a runtime-agnostic way. This makes it possible to distribute prebuilt binaries, reuse existing native libraries, and share code across ecosystems. With support for languages like C++, Rust, and Swift, Node-API opens the door to building high-performance modules for tasks like AI, encryption, and platform API access, all without being tied to specific runtime internals.

Kræn Hansen

Software Engineer

@

MongoDB

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JavaScript
6/26/2025

React Native Legal: CLI & Programmatic API - Unified Tooling for License Attributions

Discover React Native Legal, the first unified solution for managing open-source license attributions. Automatically handle both JS & native dependencies in any project via a powerful CLI and programmatic API.

Artur Morys-Magiera

Software Engineer

@

Callstack

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CI/CD
6/19/2025

Caching React Native Builds on S3 and R2 With RNEF

One of the core reasons we built RNEF (React Native Enterprise Framework) was to eliminate unnecessary native iOS and Android builds by reusing existing artifacts: saving time, compute, and cost. Until now, remote caching was tied to GitHub, which limited flexibility. The latest release changes that: RNEF now supports AWS S3 and Cloudflare R2, allowing teams to store and retrieve native builds from their own infrastructure. This unlocks a much more powerful setup for enterprise teams with custom CI or compliance needs.

Michał Pierzchala

Principal Engineer

@

Callstack

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AI
6/4/2025

How I Used MCP to Control My Friend's Home

Curious about Model Context Protocol? This post shows how MCP helps LLMs like Claude access real-world data. You'll follow a real use case-connecting a smart home API to Claude using a Node server-to see what MCP enables, how it works, and why it is the USB-C of AI tooling.

Kewin Wereszczyński

Software Engineer

@

Callstack

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AI
5/28/2025

Want to Run LLMs on Your Device? Meet MLC

Running LLMs locally on mobile isn’t a fantasy-it’s possible with MLC. This post explains how MLC compiles both model and runtime to create optimized, cross-platform packages for local inference. Discover what’s required, how it works, and why MLC stands out among edge ML frameworks.

Kewin Wereszczyński

Software Engineer

@

Callstack

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Performance
5/21/2025

Multithreading Isn’t Free: Performance Pitfalls Visualized

This article walks through real-world examples of profiling multithreaded C++ code. It shows what happens when you throw too many threads at a problem, how to measure performance with Tracy, and why smarter scheduling beats brute force. While the code is in C++, the takeaways apply to any performance-critical system.

Mariusz Pasiński

Software Engineer

@

Callstack

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AI
5/15/2025

Meet react-native-ai: LLMs Running on Mobile, for Real

Running AI models locally in React Native used to sound impossible, but not anymore. This post introduces react-native-ai, a new library powered by MLC and integrated with Vercel AI SDK, enabling on-device LLM inference with a web-like API and native performance.

Szymon Rybczak

Software Developer

@

Callstack

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Super Apps
5/14/2025

New in Re.Pack 5.1: Preloading Remotes, Runtime Hooks, and Faster Startups

This release of Re.Pack adds runtime hooks for customisation of script loading, support for prefetching of Module Federation 2 remote modules, and experimental faster hot startups via persistent cache. It also ensures full compatibility with React Native 0.79 and improves support for module resolution with Package Exports.

Jakub Romańczyk

Software Engineer

@

Callstack

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Open Source
5/13/2025

React Native Legal: Zero-Config OSS License Screens for Your App

Open-source libraries power all React Native apps, but many devs overlook the need to acknowledge them inside the app itself. This post introduces React Native Legal, a zero-config tool that generates license metadata and adds a native-style license screen across iOS, Android, tvOS, and AndroidTV.

Michał Pierzchala

Principal Engineer

@

Callstack

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Article
7/17/2025

Build and Run Node-API Modules in React Native

Learn how to create a simple Node-API module, try it out in Node.js, then get it running in React Native, and finally publish it to npm for others to use.
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Article
7/14/2025

On-Device Apple LLM Support Comes to React Native

React Native now supports Apple’s on-device LLM for private, fast, and offline AI experiences. Build with Foundation Models and bring Apple Intelligence features to your mobile app.
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Article
7/10/2025

Announcing Node-API Support for React Native

We are bringing Node-API to React Native to simplify native module development. Learn how this ABI-stable, cross-runtime system can unlock faster builds, better maintainability, and broader ecosystem interoperability.
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Article
6/26/2025

React Native Legal: CLI & Programmatic API - Unified Tooling for License Attributions

Discover React Native Legal, the first unified solution for managing open-source license attributions. Automatically handle both JS & native dependencies in any project via a powerful CLI and programmatic API.
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Article
6/19/2025

Caching React Native Builds on S3 and R2 With RNEF

Learn how to cache your React Native builds and store them on Amazon S3 or R2 to reuse across your team.
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Article
6/4/2025

How I Used MCP to Control My Friend's Home

Learn how MCP works with a hands-on project that connects Claude AI to smart home data using a Node.js server.
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Live Stream
Live Stream
7/16/2025

Live Dev Session: Node-API, Wallets & Worklets in React Native

Node-API in RN, Apple’s LLM, react-native-wallet, ChromeOS rumors. The Week 29 React Native stream breaks it all down with some code and a lot of commentary.
Live Stream
Live Stream
7/15/2025

Build High-Performance Modules in React Native With Node-API

Discover how to build and share native code in React Native using Node-API: faster builds, runtime agnostic, and language flexible.
Live Stream
Live Stream
7/10/2025

Live Dev Session: Unistyles 3.0, SSR With Hermes & Expo SDK 52

From inside shadows to decentralized music players, catch the latest React Native takes in Week 28 live dev session with Łukasz, Kewin, and Mike.
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Podcast
7/16/2025

Structure Monorepo for Speed, Scale & Sanity

Discover how Nx empowers teams to build and scale monorepos without losing their sanity, from selective testing to AI-powered workflows.
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Podcast
6/12/2025

Build Faster and Scale Smarter With React Native Enterprise Framework

Discover how React Native Enterprise Framework cuts build times, streamlines CI, and simplifies large-scale app development for growing teams.
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Podcast
5/16/2025

You Don’t Need a Rewrite, You Need React Native Brownfield

Discover how modern React Native Brownfield integration enables cross-platform power in native apps, without rewriting from scratch.