Unreadable structured JSON logs — terminal watcher that pretty-prints, filters, highlights

Reading and debugging JSON-structured logs in a terminal is slow and error-prone: raw lines, nested objects and inconsistent field names force engineers to pipe into jq, paste into browsers, or mentally map dozens of keys during incidents. This friction specifically impacts developers, SREs, and on-call responders across an estimated 30 million professional developers working with microservices and structured logging by default. You could build a terminal watcher that tails streams and live-prettifies JSON with schema-aware field folding, fast field-level filtering and highlighting, multi-source tailing (kubectl, docker, systemd) and customizable rules in a single, small installable binary. Complement that with optional on-device ML micro-models (on the order of 10–50 MB) to detect patterns, surface anomalies, and auto-suggest parsing rules without sending logs to the cloud, plus a plugin API and TUI for rapid incident navigation. The market is receptive now: developers spend roughly $400 per year on developer and observability tooling (a $12.0B addressable market), frameworks are increasingly emitting JSON by default, and terminal-first workflows plus edge inference make a low-latency, privacy-preserving CLI tool commercially viable. To stand out in a medium-competition landscape (market score 88/100, revenue potential 78/100) focus on extreme terminal UX, minimal setup, offline ML for privacy, and deep integrations, while being realistic about the hard work required to build broad integrations, gain adoption, and convert free users into paying customers.