The Death of the React Native Bridge: Moving from JSON to JSI in 2026

Subrata Kumar Das Posted on May 30           The Death of the React Native Bridge: Moving from JSON to JSI in 2026 # reactnative # subrata # tutorial # ai What is the Native Bridge? The React Native Bridge is a communication layer that allows the JavaScript thread and the Native threads (iOS/Android) to talk to each other. Because JavaScript and native languages (like Swift, Objective-C, Java, or Kotlin) cannot communicate directly, they require a middleman. The Bridge functions as a message broker. How it works: Serialization: JavaScript converts actions or data into JSON strings. Asynchronous Transport: The JSON payload is sent asynchronously across the bridge. Deserialization: The native side decodes the JSON and executes the requested platform action (e.g., rendering a view or accessing hardware). When is a Native Bridge Required? By default, React Native handles everyday components (like or ) and APIs automatically. However, you must manually create a custom native bridge (via Native Modules or Native UI Components) in the following scenarios: Accessing Unsupported Hardware: When you need device features lacking a built-in React Native API—such as an advanced camera sensor, biometrics (FaceID/Fingerprint), or custom Bluetooth peripherals. Integrating Third-Party Native SDKs: When a service provider (like a payment gateway, analytics tool, or advertisement network) only gives you an iOS CocoaPod or an Android Gradle dependency. Reusing Existing Native Code: When you are migrating an older native app to React Native and want to salvage functional Kotlin, Swift, or Objective-C business logic. High-Performance Heavy Lifting: When executing intensive tasks—like image processing, audio manipulation, or complex database operations—that would otherwise freeze the single-threaded JavaScript environment. Custom UI Renders: When incorporating a platform-specific UI layout that cannot be fully built using React Native's standard cross-platform comp