loonghao jq JSON Processor
Transform and filter JSON data using jq, the lightweight and flexible command-line JSON processor.
When to use
- Extracting specific fields from REST API responses in CI scripts
- Reshaping JSON payloads before forwarding to downstream services
- Generating human-readable summaries from structured data
- Validating JSON schema compliance in test pipelines
Inputs
{
"input": { "users": [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}] },
"filter": ".users[] | select(.age > 26) | .name",
"compact": false
}
| Field | Required | Description |
|---|---|---|
input |
✓ | JSON object or array to process |
filter |
✓ | jq filter expression |
compact |
✗ | Output compact JSON without pretty-printing (default: false) |
raw |
✗ | Output raw strings instead of JSON (default: false) |
Common filters
# Extract all artifact IDs from a registry response
echo $RESPONSE | jq '[.items[].id]'
# Filter skills by tag
echo $SKILLS | jq '[.[] | select(.tags | contains(["ci"]))]'
# Format a summary table
echo $DATA | jq -r '.[] | "\(.name)\t\(.version)"'
# Merge two JSON objects
jq -n --argjson a "$OBJ_A" --argjson b "$OBJ_B" '$a + $b'
Output
{
"result": "Alice",
"elapsed_ms": 2
}