Lightweight C++23 S3 client with no extra deps (just curl and OpenSSL)

Name: Lightweight C++23 S3 client with no extra deps (just curl and OpenSSL)
Availability: InStock
Author: ggcr

by ggcr·Jun 13, 2026·5 points·5 comments

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AI Analysis

●●SolidBig BrainNiche Gem

C++23 S3 client with just curl and OpenSSL — refreshingly minimal.

Strengths

•Custom FSM-based XML parser instead of pulling in heavy XML libraries
•Modern C++23 features like std::expected and std::println throughout
•Paginator abstraction handles S3 continuation tokens automatically

Weaknesses

•Author admits not production-ready and primarily tested against MinIO
•AWS SDK compatibility unproven — may have bugs with real S3 buckets

Post Description

Attached is my attempt at making a small toy S3 client without any other dependency besides libcurl and OpenSSL. Was tested mainly on MinIO (RIP) locally, so I would expect some bugs when using it against AWS, although I was able to play with it on some open access buckets

Be aware that I am not a C++ programmer and this project was indeed done to learn a bit of C++ myself :')

Feedback on any of the code, either on gtest, or the benchmarking section or the core itself is welcome!