jq
Command-line JSON processor. Extract, filter, transform JSON.
Best use case
jq is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Command-line JSON processor. Extract, filter, transform JSON.
Teams using jq should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/jq/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How jq Compares
| Feature / Agent | jq | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Command-line JSON processor. Extract, filter, transform JSON.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# jq
Command-line JSON processor for extracting, filtering, and transforming JSON.
## Installation
**macOS / Linux (Homebrew):**
```bash
brew install jq
```
**All platforms:** See [jqlang.org/download](https://jqlang.org/download/) for packages, binaries, and build instructions.
## Usage
```bash
jq '[filter]' [file.json]
cat file.json | jq '[filter]'
```
## Quick Reference
```bash
.key # Get key
.a.b.c # Nested access
.[0] # First element
.[] # Iterate array
.[] | select(.x > 5) # Filter
{a: .x, b: .y} # Reshape
. + {new: "val"} # Add field
del(.key) # Remove field
length # Count
[.[] | .x] | add # Sum
keys # List keys
unique # Dedupe array
group_by(.x) # Group
```
## Flags
`-r` raw output (no quotes) · `-c` compact · `-s` slurp into array · `-S` sort keys
## Examples
```bash
jq '.users[].email' data.json # Extract emails
jq -r '.name // "default"' data.json # With fallback
jq '.[] | select(.active)' data.json # Filter active
jq -s 'add' *.json # Merge files
jq '.' file.json # Pretty-print
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