State debuggers

Redux DevTools is a development utility designed for inspecting, monitoring, and replaying state changes within applications built using the Redux predictable state container. It functions as a JavaScript state inspector that tracks data flow and visualizes action sequences to assist in identifying logic errors during the development process. The tool provides time-travel debugging capabilities, allowing developers to navigate through recorded action sequences to isolate specific application states. By capturing state transitions as a sequential log, it enables the reproduction of past applic

This project is a state management inspector and debugging tool for Redux. It provides a browser-based interface for inspecting and modifying application state and actions in real time, serving as an action logger and time travel debugger to troubleshoot application logic. The tool allows users to navigate a chronological history of state changes to replay previous versions of the application or skip specific actions. It also functions as a remote monitoring bridge, streaming Redux state and actions from non-browser environments to a centralized debugging interface. The capability surface in

Vue-devtools is a browser debugger and state inspector for Vue.js applications. It functions as a frontend framework utility integrated into the browser to analyze the structure and internal state of web applications during development. The tool provides capabilities for component analysis and state inspection, allowing for the examination of component hierarchies and real-time data flow. It enables the monitoring of reactivity and the organization of running applications within the browser developer tools pane. The project covers a broader debugging workflow focused on observability and the

Reactime is a browser extension designed for debugging and profiling React applications. It provides a specialized interface for monitoring component hierarchies, tracking state transitions, and analyzing data flow within complex component trees. The tool distinguishes itself through time-travel debugging capabilities, which allow developers to capture and replay state snapshots to isolate logic errors. It also features a dependency graph mapper that visualizes the relationships between providers and consumers, clarifying how information is distributed throughout an application. Beyond core

⚙️ Browser devtools extension for debugging Vue.js applications.

A debugger for Clojure and ClojureScript with some unique features.

This is a visual debugging tool for VS Code that renders program variables and data structures as graphical diagrams during active debugging sessions. It functions as a programmable framework that converts internal runtime data and debug expressions into visual representations to assist in understanding program state. The project distinguishes itself through a programmable extraction system that allows the injection of custom JavaScript scripts into the debuggee. These scripts define how project-specific data types are parsed and transformed into JSON formats compatible with the visualization

Tweakpane is a web GUI control panel and JavaScript parameter debugger used for inspecting frontend state and monitoring real-time variable changes. It provides a graphical interface for adjusting application parameters and tracking values as they change during program execution. The project allows for the creation of interactive inputs and read-only value monitors that bind directly to data variables. It organizes these controls through a hierarchical layout of folders and tabs and supports the serialization of control panel configurations and parameter states into JSON files for persistence

connected-react-router is a synchronization tool that binds React Router state and browser history to a Redux store. It maps routing information and URL parameters into a global state tree, enabling the application to manage navigation through a unidirectional data flow. The library allows navigation to be triggered by dispatching actions rather than calling imperative history methods. This middleware-driven approach enables URL updates to be initiated from business logic or asynchronous processes. The system synchronizes the current location, hash, and search parameters into the global stat

React DevTools is a set of web browser developer tools integrated into Chrome and Firefox. It functions as a component inspector and UI debugger designed to visualize the component hierarchy and analyze the runtime behavior of React applications. The project includes a performance profiler used to detect unnecessary component re-renders and improve rendering efficiency. It also provides utilities for mapping virtual component trees to the physical DOM and linking rendered UI elements directly to their corresponding source code files and line numbers. The toolset covers component hierarchy vi

Livestore is a reactive state management framework that utilizes a local SQLite database to store and synchronize application data. It provides an event-sourced state store that processes typed events through materializer functions to derive and persist application state. The framework implements offline-first data synchronization using a push-pull engine and append-only event logs to maintain consistency between clients and servers. It includes a real-time presence system for tracking user activity and shared session status across connected clients. The system covers a broad capability surf

Redux-Observable is a functional middleware for Redux that treats action streams as observables to manage complex asynchronous side effects and timing. It acts as an asynchronous action orchestrator, transforming streams of Redux actions into new actions through pipelines of observable-based side effects to coordinate application state changes. The project allows for the dynamic loading, injection, and replacement of side-effect streams at runtime. This enables the addition of asynchronous task handlers without requiring a full application restart, supporting code splitting and lazy loading o