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Field notes from living in JSON.

Short, practical pieces on reading traces, mapping unfamiliar payloads, and pulling exactly the slice you need — the way we actually use QDev.

GUIDESJul 8, 2026 · 5 min read

How to read deeply nested JSON without losing your mind

Scrolling, a throwaway script, jq, and DuckDB — four ways to read deep JSON, when each holds up, and where each falls apart. Plus the traps that make it worse.

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AI ENGINEERSJul 7, 2026 · 4 min read

Read an agent trace in ten seconds

LLM agent traces are deep, repetitive JSON. Here's how to go from a 4,000-line dump to the one tool call that failed — without writing a scratch script.

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DATA ENGINEERSJul 5, 2026 · 3 min read

Understand any JSON payload in one glance

You don't need the docs to learn an API response's shape. QDev infers a JSON Schema from the data itself — the fastest map of an unfamiliar payload.

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