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vite-errors-dev-server

Diagnose and resolve Vite dev server startup and runtime errors.

3|Updated Mar 19, 2026
Search Tags:#vite#cors#proxy#dev-server#https#hmr#middleware-mode
One-click install
npx skills add https://github.com/Impertio-Studio/Vite-Claude-Skill-Package --skill vite-errors-dev-server-impertio-studio
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vite-errors-dev-server
Source: https://github.com/Impertio-Studio/Vite-Claude-Skill-Package/tree/main/skills/source/vite-errors/vite-errors-dev-server
Command: npx skills add https://github.com/Impertio-Studio/Vite-Claude-Skill-Package --skill vite-errors-dev-server-impertio-studio

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Use when encountering dev server startup failures, HMR issues, proxy errors, CORS blocks, or module not found errors during development. Prevents misconfiguring server.hmr behind reverse proxies and forgetting appType: 'custom' in middleware mode.

Core Features & Use Cases

  • Diagnostic tables and quick fixes for common Vite dev-server problems.
  • Guidance for enabling proper HMR boundaries, proxy configurations, and HTTPS certificates.
  • Workflow templates for middleware mode, and handling port conflicts, file-watcher issues, and allowed-hosts.

Quick Start

Run the diagnostic skill to identify the issue and apply the recommended configuration changes.

Frequently Asked Questions about vite-errors-dev-server

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fix Vite dev server proxy and CORS errors?▼

Fix Vite dev server proxy and CORS errors by updating your server.proxy configuration to forward requests and bypass cross-origin restrictions. This skill provides diagnostic tables and targeted quick fixes for resolving these exact issues.

Why does Vite HMR fail behind a reverse proxy?▼

Vite HMR fails behind a reverse proxy due to misconfigured server.hmr settings that block WebSocket connections. This skill diagnoses WebSocket connection failures and provides guidance for establishing proper HMR boundaries behind proxies.

How to resolve EADDRINUSE and port conflicts in Vite?▼

Resolve EADDRINUSE and port conflicts in Vite by identifying occupied ports and applying specific configuration changes. This skill codifies fixes for port conflicts and provides workflow templates to handle these startup failures.

Does this skill support Vite middleware mode and HTTPS certificates?▼

Yes, this skill supports Vite middleware mode and HTTPS certificates across Vite 6.x to 8.x. It provides workflow templates for custom appType configurations and guidance for enabling proper HTTPS certificates during development.

What causes server.fs.strict violations in Vite?▼

server.fs.strict violations in Vite occur when accessing files outside the defined root directory. This skill specifically codifies the necessary configuration changes to resolve these file system restriction errors.

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