OpenClaw · Skill
JSON Modifier
A utility for modifying JSON files using RFC 6902 JSON Patch format. Supports precise additions, removals, replacements, moves, copies, and tests.
Install
Start with the primary install command. Alternate entrypoints are included below for ClawHub and OpenClaw CLI users.
Primary command
clawhub install wanng-ide/json-modifierClawHub installer
npx clawhub@latest install wanng-ide/json-modifierOpenClaw CLI
openclaw skills install wanng-ide/json-modifierDirect OpenClaw install
openclaw install wanng-ide/json-modifierWhat this skill does
A utility for modifying JSON files using RFC 6902 JSON Patch format. Supports precise additions, removals, replacements, moves, copies, and tests.
Why it matters
Avoids brittle regex and full-file rewrites by applying targeted, validated patches that leave the rest of the document unchanged.
Typical use cases
- Bumping version numbers in package.json
- Adding feature flags to a config file
- Removing deprecated keys from API response configs
- Appending items to arrays in settings files
- Updating nested values in multi-environment config files
Source instructions
JSON Modifier
A utility for modifying JSON files using RFC 6902 JSON Patch format. Supports precise additions, removals, replacements, moves, copies, and tests.
Usage
# Modify a file in place
node skills/json-modifier/index.js --file path/to/config.json --patch '[{"op": "replace", "path": "/key", "value": "new_value"}]'
# Modify and save to a new file
node skills/json-modifier/index.js --file input.json --patch '[...]' --out output.json
# Use a patch file
node skills/json-modifier/index.js --file input.json --patch-file patches/update.json
Patch Format (RFC 6902)
The patch must be a JSON array of operation objects.
Examples
Replace a value:
[
{ "op": "replace", "path": "/version", "value": "2.0.0" }
]
Add a new key:
[
{ "op": "add", "path": "/features/new_feature", "value": true }
]
Remove a key:
[
{ "op": "remove", "path": "/deprecated_key" }
]
Append to an array:
[
{ "op": "add", "path": "/list/-", "value": "item" }
]
Safety
- Validates patch against document before applying.
- Atomic write (writes to temporary file, then renames).
- Preserves indentation (default: 2 spaces).