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Dev.to
6/28/2026
Building JSON input validation layer for poker analysis tool

Building JSON input validation layer for poker analysis tool

Original: Before the Algorithm: Building the Input Layer for My Poker Analysis Tool

Short summary

The author built a JSON-based input validation layer for a poker analysis tool to catch invalid scenarios at the input stage with field-level error messages instead of silent failures. She created 5 incrementally complex scenario modes and decoupled form models from JSON to prepare for a GUI. CLI utilities test the architecture before committing to a user interface.

  • Designed 5 scenario modes with growing complexity to isolate where breakage occurs
  • Built form models separate from JSON to support future GUI without a complete rewrite
  • Implemented field-level validation that surfaces errors without auto-correction

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