ESP32-HTTP-Client Library Cuts RAM Use 99% and Speeds Up API Calls 12x

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A new open-source library called ESP32-HTTP-Client aims to solve common memory and performance problems faced by ESP32 developers working with REST APIs. Unlike the standard HTTPClient and ArduinoJson combination, which buffers entire HTTP responses in RAM before parsing, this library streams JSON data directly into C++ variables without intermediate memory allocation. The library also maintains persistent TCP/TLS connections via HTTP Keep-Alive, eliminating repeated handshake overhead on consecutive requests. Benchmark tests across 100 HTTP GET requests showed heap allocation dropping from roughly 58 KB to near zero per request, and average execution time falling from 750 ms to 59 ms. The library is available for both PlatformIO and Arduino IDE under the identifier ESP32-HTTP-Client by developer PedroFnseca.

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