Day 5/60: JSON API design
60 Day Go Backend Engineering Challenge
Today I focused on making json api design feel like request flow design rather than just handler boilerplate. The strongest checkpoints were name the request boundary, validation step, and response contract before writing handler code, keep routing and middleware explicit enough that ownership of each concern is obvious, and make serialization and status codes follow the service contract rather than handler convenience.
The mistake I wanted to avoid was mixing validation, orchestration, and transport formatting in one handler. The day felt better once the service boundary stayed visible and each component had one job.
The goal for tomorrow is simple: keep the rule clear enough that the next service still feels related to the same design idea. I also want to keep tracing one request path end to end because it exposes weak assumptions faster than a larger demo.
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