Fetch Mcp

• fetchyoutubetranscript — Fetch a YouTube video's captions/transcript. Uses yt-dlp if available, otherwise extracts directly from the page. Accepts an additional lang parameter (default: "en") to select the caption language.

Installation

As an MCP server

Add to your MCP client configuration:

{
  "mcpServers": {
    "fetch": {
      "command": "npx",
      "args": ["mcp-fetch-server"]
    }
  }
}

As a CLI

npx mcp-fetch   [flags]

Or install globally:

npm install -g mcp-fetch-server
mcp-fetch   [flags]

CLI Usage

mcp-fetch   [flags]

Commands

| Command | Description | |---------|-------------| | html | Fetch a URL and return raw HTML | | markdown | Fetch a URL and return Markdown | | readable | Fetch a URL and return article content as Markdown (via Readability) | | txt | Fetch a URL and return plain text | | json | Fetch a URL and return JSON | | youtube | Fetch a YouTube video transcript |

Flags

| Flag | Description | |------|-------------| | --max-length | Maximum characters to return | | --start-index | Start from this character index | | --proxy | Proxy URL | | --lang | Language code for YouTube transcripts (default: en) | | --help | Show help message | | --version | Show version |

Examples

# Fetch a page as markdown
mcp-fetch markdown https://example.com

# Extract article content without boilerplate
mcp-fetch readable https://example.com/blog/post

# Get a YouTube transcript in Spanish
mcp-fetch youtube https://www.youtube.com/watch?v=dQw4w9WgXcQ --lang es

# Fetch with a length limit
mcp-fetch html https://example.com --max-length 10000

# Fetch through a proxy
mcp-fetch json https://api.example.com/data --proxy http://proxy:8080

Environment Variables

| Variable | Description | |----------|-------------| | DEFAULT_LIMIT | Default character limit for responses (default: 5000, set to 0 for no limit) | | MAX_RESPONSE_BYTES | Maximum response body size in bytes (default: 10485760 / 10 MB) |

Example with a custom limit:

{
  "mcpServers": {
    "fetch": {
      "command": "npx",
      "args": ["mcp-fetch-server"],
      "env": {
        "DEFAULT_LIMIT": "50000"
      }
    }
  }
}

Features

• Fetch web content as HTML, JSON, plain text, or Markdown
• Extract article content with Mozilla Readability (strips ads, nav, boilerplate)
• Extract YouTube video transcripts (via yt-dlp or direct extraction)
• Proxy support for requests behind firewalls
• Pagination with max_length and start_index
• Custom request headers
• SSRF protection (blocks private/localhost addresses and DNS rebinding)
• Response size limits to prevent memory exhaustion

Development

bun install
bun run dev     # start with watch mode
bun test        # run tests
bun run build   # build for production

License

This project is licensed under the MIT License.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: zcaceres
• Source: zcaceres/fetch-mcp
• License: MIT

Install and usage instructions live in the source repository linked above.