33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
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# JQ, stream json parser
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`jq` is a minimal json parser that's pretty useful in shell scripts. It can
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quickly filter json outputs for reading something. Most languages, for example
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js, have much faster json-parsers built-in, so it's better to use those when
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possible
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Json output usually comes in one of two forms, either a single json object, or
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an array of jsons. To extract jsons we can use
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```bash
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yabai -m query --windows --window | jq '.' # Already a single json
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yabai -m query --windows | jq '.[]' # Iterates through array
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```
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`jq` takes in a filter on the right side, after a pipe-like separator. The
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output will just be the that value for single fields
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```bash
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yabai -m query --windows | jq '.[] | .id' # Id of every window
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yabai -m query --windows | jq '.[] | .id, .app' # ID and name
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yabai -m query --windows | jq '.[] | .frame.x' # x field in frame field
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```
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Your output can be either raw values, json objects, or arrays:
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```bash
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yabai -m query --windows | jq '.[] | .id' # Raw id
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yabai -m query --windows | jq '.[] | { id: .id }' # Id objects
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yabai -m query --windows | jq '.[] | [{ id: .id }]' # Id objects in individual arrays
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yabai -m query --windows | jq '[.[] | { id: .id }]' # Id objects in one array
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```
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