Run multiple MCP clients on a NodeJS Express server (adapter/middleware)
Most developer tooling work still happens through a UI a human drives. MCP Middleware Adapter For Express Servers MCP server moves it into the conversation instead. Run multiple MCP clients on a NodeJS Express server (adapter/middleware).
Note: You'll need to authenticate to GitHub Packages if installing from a private repository. See GitHub Packages documentation for more details.
The server publishes 1 tool. What each one is for:
MCPClient — The main class for creating an MCP endpoint on your Express serverThe server ships on npm as mcp-express-adapter, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.
Configuration is passed through the environment: ANTHROPIC_API_KEY. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. MCP Middleware Adapter For Express Servers's toolset — MCPClient — is a fair guide to whether it matches your workflow. It is maintained by Moe03; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| MCPClient | The main class for creating an MCP endpoint on your Express server. |
{
"mcpServers": {
"express-adapter": {
"command": "npx",
"args": ["-y", "mcp-express-adapter"],
"env": {
"ANTHROPIC_API_KEY": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| ANTHROPIC_API_KEY | Credential the server authenticates with. | Yes |
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