Building a local-first multi-JSON workspace in the browser

Most JSON formatters I’ve used only handle one JSON at a time. That becomes painful when you're working with multiple API responses or trying to compare payloads. I wanted something closer to a workspace , not just a formatter — so I explored a local-first approach where everything runs entirely in the browser (no network calls). What I focused on Working with multiple JSONs simultaneously (like tabs) Keeping everything private and offline Adding a diff view for comparing objects Handling large JSON files without freezing the UI Challenges I ran into 1. Large JSON performance Rendering deeply nested objects can easily block the main thread. I had to be careful with parsing, virtualization, and avoiding unnecessary re-renders. 2. Diffing nested structures Simple diff algorithms break down with large or deeply nested JSON. Balancing accuracy vs performance was tricky. 3. Local storage limits Managing multiple JSONs locally isn’t trivial — especially when users paste large payloads. Curio