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trac3r00trac3r00/agent-skills/skills/json-diff/SKILL.md

json-diff

Skill0 starsChanged 3 months agoMITView on GitHub

Semantic diff between two JSON documents reported by JSON path — added, removed, changed with old/new values, recursing nested objects and comparing arrays positionally. Use when `diff` on JSON is useless (key reordering, formatting noise), for config drift checks, API response comparison, or CI gates on expected output.

1 other project uses a version of this.

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SKILL.md

JSON Diff

diff on JSON is useless — one reordered key and everything flags. This parses both documents and reports what actually changed, by path.

Commands

python3 scripts/json_diff.py old.json new.json
python3 scripts/json_diff.py a.json b.json --json
python3 scripts/json_diff.py expected.json actual.json --max-changes 0
curl -s api/v1/config | python3 scripts/json_diff.py - prod-config.json

Output

~ port: 8080 -> 9090
+ db.ssl: true
- legacy_mode: false
~ tags: array[2] -> array[3]

Paths use dot notation for objects (db.host) and brackets for arrays (items[2]). --max-changes N makes it a CI gate: exit 1 when the count exceeds N (use 0 for "must be identical").

Pairs with

env-gate (config completeness), api-tester (fetch the JSON this diffs), verification-before-completion (the discipline that makes you run it).

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