Local Web Test Tool
Spin up local servers, auto-capture screenshots and logs, pinpoint frontend bugs, and speed up web debugging.
What Is Local Web Test Tool?
Local Web Test Tool is an automated local server orchestration, browser-testing, and frontend debugging skill on EasyClaw. Designed specifically for full-stack developers and QA engineers, it automates the process of spinning up local servers (e.g., node, npm run dev), executing headlessly simulated user journeys (such as login flows), capturing visual page-by-page screenshots, parsing console errors, and compiling detailed, exportable debug logs in a single operational run.
The skill is built for frontend developers auditing responsive layouts across viewport break-points, full-stack engineers debugging client-server API sync conflicts, and QA specialists building automated end-to-end (E2E) web testing suites.
The expected outcome is a structured, action-oriented Debug Report: featuring chronological test-step summaries, visual page-interaction screenshots, extracted console and network error logs, and precise root-cause recommendations to fix identified frontend bugs.
How Local Web Test Tool Works
1. Orchestrate local servers. Specify your local server commands (e.g., `npm run dev` on port 5173 for React, or a backend Node server on port 3000). The skill spins up the servers headlessly.
2. Interactive browser simulation. It initiates an automated, headless browser session (Chromium-based), navigating to your localhost address and simulating user actions (clicks, form fills, navigations) sequentially.
3. Multi-viewport visual capture. As the browser navigates the workflow, the skill automatically captures high-resolution screenshots at each step, and can scale viewports (desktop, mobile) to test layout responsiveness.
4. Log and error parsing. The skill monitors the browser's active console log streams and network request panels, capturing and categorizing errors (such as 404 broken assets or 500 API failures) as they happen.
5. Debug report compilation. On workflow completion, the skill compiles a comprehensive report: writing the screenshots, console traces, and network error tables to your local workspace, paired with a direct local link in your chat.
Key Features
- Headless server orchestrator: Spins up, tracks, and terminates local development servers headlessly.
- E2E browser simulator: Automates clicks, form entries, and navigations across local test routes.
- Visual step capturer: Automatically captures high-resolution screenshots at each step of the user journey.
- Console and network tracker: Intercepts and logs frontend console errors, warnings, and API failures.
- Multi-viewport responsive check: Audits layout rendering across desktop, tablet, and mobile dimensions.
- Direct local path save: Writes screenshots and debug logs directly to your local workspace exports.
What Problems Does Local Web Test Tool Solve?
1. Automated testing of a local login flow
A frontend developer has completed building a new login flow on `http://localhost:5173` and wants to verify if it works without manual clicking. The skill spins up the local Vite server, navigates to the login page, enters mock credentials into the inputs, clicks "Submit," captures screenshots of each step, and verifies if the browser successfully redirects to the dashboard, confirming stable E2E execution.
2. Debugging client-server connection conflicts
A developer is testing a full-stack app locally (backend on port 3000, frontend on port 5173). They start both servers through the skill. The tool runs an automated form-submission test on the frontend: capturing a console error trace showing a `CORS blocking policy` error on a POST request, and outputs the exact CORS configuration fix for their Node backend.
3. Auditing layout responsiveness across devices
Before launching a new landing page, a QA engineer wants to verify that the layout doesn't break on mobile screens. The skill loads the local page, captures screenshots at desktop (1920x1080) and mobile (375x812) viewports side-by-side, and flags a CSS layout overlap on the mobile viewport, allowing for physical style fixes.
4. Auto-testing buttons after a production build
An engineer has generated a production build for a React admin panel. They ask the skill to "auto-click every button." The tool recursively scans the DOM, clicks all active buttons, and generates full-page screenshots for each state, catching any broken routes or blank-screen rendering crashes.
5. Compiling crash logs for developer reports
A QA analyst is testing a local site and hits a page freeze. Instead of copying individual logs, they ask the skill to export debug logs. The tool parses the browser's console buffer, extracts the active Javascript trace leading up to the freeze, and exports a clean, developer-ready Markdown debug log.
Example Workflow
A developer needs to test their local React signup page and capture any console errors.
1. They open EasyClaw and activate Local Web Test Tool.
2. They run: *"Start 'npm run dev' on port 5173. Navigate to signup page, fill form, click register, and export screenshots."*
3. The skill boots the Vite server headlessly, launches the browser simulator, and executes the signup steps.
4. It captures 3 step screenshots and intercepts a console network warning (e.g., `422 Unprocessable Entity`).
5. It writes the screenshots and the debug log to `public/data/debug_exports/signup-test/`.
6. It displays the test summary and direct links in the conversation.
Local web servers booted, simulated, and audited in under 45 seconds.
Getting Started with Local Web Test Tool
Service Lifecycle — Auto-starts and stops frontend & backend services—no manual switching.
Dynamic Page Scout — Screenshots first, then extracts selectors for pixel-perfect element targeting.
Headless Browser Tests — Runs Chromium in the background for lightning-fast UI regression checks.
Multi-Service Parallel — Launches backend + frontend together to recreate real integration environments.
Core Features
Service Lifecycle
Auto-starts and stops frontend & backend services—no manual switching.
Dynamic Page Scout
Screenshots first, then extracts selectors for pixel-perfect element targeting.
Headless Browser Tests
Runs Chromium in the background for lightning-fast UI regression checks.
Multi-Service Parallel
Launches backend + frontend together to recreate real integration environments.
Frequently Asked Questions
What local environments and platforms are supported?
The skill is compatible with all standard web frameworks (React, Vue, Angular, Svelte, HTML5) and backend platforms (Node, Python, Go) running locally on your machine, using any custom package commands (npm, yarn, pnpm).
What is E2E (End-to-End) testing?
E2E testing is a methodology used to test a web application's flow from start to finish, simulating real user behaviors (like logging in, adding items to a cart, and checking out) to verify that all integrated systems function correctly together.
Can I run this skill completely offline?
Yes. Since the skill orchestrates local development servers and headlessly navigates localhost directories on your machine, all testing, console tracking, and screenshot capturing can run completely offline with zero internet access.
Do I need to write custom Selenium or Playwright code?
No. The skill's natural-language interface translates your plain English instructions (e.g., "click the register button and enter mock email") into exact browser automation commands, bypassing the need to write custom testing scripts.
Are my private database keys and server configurations safe?
Yes. All server executions, browser automations, console parsings, and file writes are executed entirely locally on your machine within your workspace session, keeping your development data strictly confidential.
What is a "detached HEAD" state?
This is a standard Git terminology. In the context of local testing, "orphan servers" are background processes that continue running after a test halts. The skill's server orchestrator automatically tracks and terminates these processes when you exit.
Can I test layouts on mobile viewports?
Yes. You can instruct the skill to adjust the browser viewport to standard mobile dimensions (e.g., iPhone 15 size 393x852) to test mobile responsiveness and capture mobile-layout screenshots.
What happens if a server command throws a fatal error?
If your local server fails to compile or crashes on startup, the orchestrator captures the terminal error buffer and displays the exact trace in your chat, allowing you to debug compilation errors immediately.
What file formats are exported?
Screenshots are exported as high-resolution PNG (`.png`) files, and debug console logs are exported as clean, structured Markdown (`.md`) files inside your workspace exports folder.
Can I run multiple local servers simultaneously?
Yes. You can instruct the skill: "start our backend on port 3000 and frontend on port 5173." The orchestrator will boot both servers in separate background threads, allowing for full-stack local integration testing.
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