AstraDev - API Interceptor & Mock

Instant API mocking and network traffic control. Mock responses, inject delays, modify headers, and inspect HTTP requests.

AstraDev is an all-in-one developer productivity studio for browser-level API mocking, real-time HTTP traffic inspection, automated endpoint monitoring, and chaos testing. Designed for front-end developers, QA engineers, and full-stack teams, AstraDev eliminates external proxy dependencies by intercepting and modifying network traffic directly inside your browser tab. KEY FEATURES: 1. Instant API Mocking • Intercept fetch and XMLHttpRequest calls with zero external proxies or certificates. • Match requests using Exact URL, Substring, or powerful Regular Expressions. • Override HTTP status codes (200, 400, 404, 500), response bodies (JSON/Text), and custom headers. • Simulate slow network speeds and latency with customizable millisecond delays. • Quick-drop or simulate dropped requests to test error and offline recovery states. 2. Real-Time Network Traffic Inspector • Live stream of captured HTTP requests with method badges, status codes, and latency indicators. • Advanced filters: filter by URL, resource type (Fetch/XHR, JS, CSS, Media), or isolate to current tab/domain. • One-click Auto-Mock: generate complete mock rules instantly from any captured live request. • Inspect request headers, response payload, cookies, and timing breakdown in a responsive side drawer. 3. API Sentinel & Failure Monitor • Continuous health monitoring for mission-critical endpoints and third-party APIs. • Live alert counter and failure tracking for 4xx/5xx errors, network timeouts, and dropped connections. • Track and extract specific response object attributes with dynamic JSON path suggesters. • View incident logs with detailed error context and one-click incident clearing. 4. Interactive API Request Client • Built-in Postman-style HTTP workbench. • Send GET, POST, PUT, DELETE, and PATCH requests with custom headers and body payloads. • Measure real latency and view formatted response headers and JSON with syntax highlighting. • Convert successful test responses directly into active mock rules with one click. 5. Developer-First Productivity • Keyboard shortcut (Cmd+Shift+M or Ctrl+Shift+M) to toggle side panel instantly. • Command Palette (Cmd+K or Ctrl+K) for rapid navigation and rule creation. • Multi-workspace isolation (Default, Staging, Production). • Export and import rules in standard JSON, OpenAPI, and Postman Collection formats. • Optional Firebase team cloud synchronization for shared rule libraries. HOW TO USE: 1. Click the AstraDev icon in your browser toolbar or press Cmd+Shift+M (Ctrl+Shift+M) to open the Side Panel. 2. In the "Rules" tab, click "New Rule" or browse live requests in the "Traffic" tab and click "Mock". 3. Specify your URL pattern, choose your HTTP method, and define your mock response body and status code. 4. Refresh your webpage — the target requests will immediately return your custom mock response. PRIVACY & SECURITY: AstraDev operates 100% client-side. All mock rules, captured logs, and configurations are stored in your browser's local storage. Your network data is never collected, tracked, or transmitted to any third-party server without your explicit configuration. SUPPORT: Have questions, bug reports, or feature requests? Reach out via our GitHub repository or contact our developer support team.