MCP Database Server

Implementation Reference

• src/index.ts:26-46 (handler)

  Inline handler function for the 'getCollections' tool. It ensures a connection to MongoDB, lists all collections in the database, and returns their names as a comma-separated string in the MCP response format. Handles connection errors gracefully.

  this.mcpServer.tool("getCollections", async () => {
    try {
      let db = mongodbConnection.getDb();
      if (!db) {
        await mongodbConnection.connect(this.MONGODB_URI);
        db = mongodbConnection.getDb();
        if (!db) throw new Error("Failed to connect to database");
      }
      const collections = await db.listCollections().toArray();
      return {
        content: [
          { type: "text", text: collections.map((c) => c.name).join(", ") },
        ],
      };
    } catch (error) {
      console.error(error);
      return {
        content: [{ type: "text", text: "Error: " + error }],
      };
    }
  });