菜单
Extract a known field from a JSON file by running jq instead of reading the whole file.
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Use when deciding whether to add a third-party dependency or library, or when evaluating an existing one (npm install, pip install, go get, cargo add, adding to a manifest). Covers crypto/security deps, the build-it-yourself threshold, and transitive-tree risk.
Use when working in a Python repo and about to run python, pip, pytest, ruff, mypy, or any Python tool. Resolves the project virtualenv and requires full ./venv/bin/<tool> paths in all commands, plan files, and subagent prompts. Never run bare pytest or python.
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Extract a known field from a YAML file by running yq instead of reading the whole file.
| name | jq |
| description | Extract a known field from a JSON file by running jq instead of reading the whole file. |
When you need a specific field from a JSON file, reach for jq rather than
reading the whole file.
jq -r '.field' file.json
Three details easy to forget:
-r -- raw string output (no surrounding quotes)// "default" -- fallback when a field is missing or nullkeys[] -- list an object's property namesFor anything beyond this, man jq.