🤷♂️Ever wondered how large file uploads don’t crash servers?
Today, I built a streaming body parser from scratch using raw Node.js TCP sockets — no Express, no frameworks.
--> Accumulate data chunks from the TCP socket
--> Parse HTTP request headers to find Content-Length
--> Read request body safely, waiting for full body based on length
--> Support plain text and JSON parsing for POST requests
--> Avoid memory leaks by handling data in streams rather than buffering everything at once.
Most developers rely on express.json() or middleware like multer for uploads. I wanted to understand what really happens under the hood.
This deep dive helped me build a custom HTTP server that correctly handles POST request bodies — the backbone for handling forms, APIs, and uploads — without third-party dependencies.
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