mcp-server-nodejs

The server demonstrates strong security practices, particularly in preventing SQL injection. The `runQuery` tool explicitly requires an `approved: true` flag, mandating prior semantic mapping and schema validation to ensure LLM-generated SQL is safe. Identifier validation is used for table and schema names in `getSchema` to prevent injection. The `executeQuery` function rejects SQL containing semicolons by default. The `/mcp` endpoint is protected by an API key (`MCP_API_KEY`), which is enforced in production. Sensitive configurations are handled via environment variables, with no apparent hardcoded secrets. The server uses `helmet` for security headers and limits request size. A minor point for improvement is the default `CORS_ORIGIN: '*'`, though a TODO is present to restrict it in production. TLS/HTTPS is expected to be handled by a reverse proxy.