How to Build MCP Clients for Next.js and Serverless Platforms Like Vercel and AWS Lambda

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The Model Context Protocol (MCP) was originally designed for local, single-process desktop environments using standard input/output streams, where persistent process lifecycles and shared memory are available. Deploying MCP in serverless architectures such as Next.js on Vercel, AWS Lambda, or Cloudflare Workers creates a fundamental mismatch, since serverless functions are ephemeral and terminate after handling each HTTP request. This means traditional stdio-based MCP server subprocesses get orphaned or killed as soon as a function returns its response, making stateful protocol sessions impossible to maintain natively. To bridge this gap, developers must replace local process pipes with networked transports — specifically Server-Sent Events for server-to-client streaming and HTTP POST requests for client-to-server command dispatch. The engineering approach also involves enforcing data integrity through Zod and JSON Schema validation to support a production-ready, distributed MCP client architecture.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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