A mighty CSS linter that helps you avoid errors and enforce conventions.
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JSHint is a tool that helps to detect errors and potential problems in your JavaScript code
Accessibility-first browser & computer use for AI agents — one MCP server for every harness (Codex, Claude Code, OpenCode, Antigravity). Instruments the DOM/accessibility tree via CDP instead of screenshot loops: diffed snapshots, stable element refs, trusted input, typed errors. Zero dependencies
gulp plugin to send messages based on Vinyl Files or Errors to Mac OS X, Linux or Windows using the node-notifier module. Fallbacks to Growl or simply logging
Catch unhandled errors and promise rejections in your Electron app
Framework allows to perform load testing with Apache Jmeter, view application/server metrics in real-time with Grafana, analyze errors cause with detailed traces for failed requests, compare different test runs in scripted dashboard and perform frontend performance testing with sitespeed.io+webpagetest
Parse JSON with more helpful errors
TAP output formatter using difflet for inequality errors.
A toml parser and checker to avoid common errors in Substrate projects