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92 lines
3.4 KiB
Markdown
92 lines
3.4 KiB
Markdown
# JQ
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## TL;DR
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```sh
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# Only list keys.
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jq 'keys' file.json
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# Sort all the keys.
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jq --sort-keys '.' input.json > output.json
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# Add a key.
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jq --arg REGION ${AWS_REGION} '.spec.template.spec.containers[]?.env? += [{name: "AWS_REGION", value: $REGION}]' /tmp/service.kube.json
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# Delete a key.
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jq 'del(.items[].spec.clusterIP)' /tmp/service.kube.json
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# Change a value.
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jq '.extensionsGallery
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| .serviceUrl |= "https://marketplace.visualstudio.com/_apis/public/gallery"' \
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/usr/lib/code/product.json
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jq --arg NAMESPACE ${NAMESPACE} '.spec.template.spec.containers[]?.env[]? |= {name: .name, value: (if .name == "KUBERNETES_NAMESPACE" then $NAMESPACE else .value end)}' /tmp/service.kube.json
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# Change multiple values at once.
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jq '.extensionsGallery
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| .serviceUrl = "https://marketplace.visualstudio.com/_apis/public/gallery"
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| .cacheUrl = "https://vscode.blob.core.windows.net/gallery/index"
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| .itemUrl = "https://marketplace.visualstudio.com/items"' \
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/usr/lib/code/product.json
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jq '.extensionsGallery + {
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serviceUrl: "https://marketplace.visualstudio.com/_apis/public/gallery",
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cacheUrl: "https://vscode.blob.core.windows.net/gallery/index",
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itemUrl: "https://marketplace.visualstudio.com/items"
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}' /usr/lib/code/product.json
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# Add elements from an array from another file.
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jq '.rules=([input.rules]|flatten)' starting-rule-set.json ending-rule-set.json
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# Add elements from an array from multiple files.
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jq '.rules=([inputs.rules]|flatten)' starting-rule-set.json parts/*.json
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# Put specific keys on top.
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jq '.objects = [(.objects[] as $in | {type,name,id} + $in)]' prod/dataPipeline_deviceLocationConversion_prod.json
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# Convert Enpass' JSON export to a YAML file
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jq '.items[] | {title, fields} | .title + ":", (.fields[] | select(.value != "") | " " + .label + ": " + .value)' test.json -cr
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# Refactor an AWS DataPipeline definition.
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jq --sort-keys '.' datapipeline.json > /tmp/sorted.json \
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&& jq '.objects = [(.objects[] as $in | {type,name,id} + $in | with_entries(select(.value != null)))]' \
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/tmp/sorted.json > /tmp/reordered.json \
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&& mv /tmp/reordered.json datapipeline.json
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# Extract the value of elements with specific keys.
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kubectl get pods -o yaml \
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| yq -y '
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.items[]
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| select(.metadata.name | test("^runner-.*"))
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| select(.spec.tolerations[].key == "component" and .spec.tolerations[].value == "big-runner")
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| .spec.nodeSelector, .spec.tolerations' \
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-
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# Recursively find all the properties whose key is 'errors' whether it exists or not.
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# '..' unrolls the object, '?' checks for the value or returns null, and 'select(.)' is like a filter on truthy values.
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jq '[.. | .errors?[0] | select(.) ]' /tmp/helm.template.out.json
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# Find all images in a helm chart explicitly or implicitly using the tag 'latest'.
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helm template chartName \
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| yq -r '
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..
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| .image?
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| select(.)
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| select(.|test(".*:.*")|not), select(.|test(".*:$")), select(.|test(".*:latest"))' \
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-
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```
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## Further readings
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- [JQ recipes]
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[jq recipes]: https://remysharp.com/drafts/jq-recipes
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## Sources
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- [Filter objects list with regex]
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- [Select multiple conditions]
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- [Change multiple values at once]
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[change multiple values at once]: https://stackoverflow.com/questions/47355901/jq-change-multiple-values#47357956
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[filter objects list with regex]: https://til.hashrocket.com/posts/uv0bjiokwk-use-jq-to-filter-objects-list-with-regex
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[select multiple conditions]: https://stackoverflow.com/questions/33057420/jq-select-multiple-conditions#33059058
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