'Filter all but specific number

Is there a way to filter all but a specific number in a curl request result?

Here is the curl what I use in a bash:

curl -X GET "https://api.brightsky.dev/current_weather?lat=51.58&lon=7.38" \
 -H "Accept: application/json"

I need only the temperature digit(s) in the result (include - or + if any there).

The result looks like this:

{"weather": {"source_id": 42212, "timestamp": "2022-02-04T21:00:00+00:00", "cloud_cover": 100, "condition": "dry", "dew_point": 1.49, "precipitation_10": 0.0, "precipitation_30": 0.0, "precipitation_60": 0.0, "pressure_msl": 1013.8, "relative_humidity": 83, "visibility": 35616, "wind_direction_10": 240, "wind_direction_30": 240, "wind_direction_60": 240, "wind_speed_10": 18.7, "wind_speed_30": 17.6, "wind_speed_60": 16.9, "wind_gust_direction_10": 250, "wind_gust_direction_30": 250, "wind_gust_direction_60": 250, "wind_gust_speed_10": 27.4, "wind_gust_speed_30": 29.5, "wind_gust_speed_60": 31.0, "sunshine_30": 0.0, "sunshine_60": 0.0, "temperature": 4.1, "fallback_source_ids": {"cloud_cover": 11689, "condition": 11689, "pressure_msl": 11689, "visibility": 11689, "wind_direction_10": 11689, "wind_direction_30": 11689, "wind_direction_60": 11689, "wind_speed_10": 11689, "wind_speed_30": 11689, "wind_speed_60": 11689, "wind_gust_direction_10": 11689, "wind_gust_direction_30": 11689, "wind_gust_direction_60": 11689, "wind_gust_speed_10": 11689, "wind_gust_speed_30": 11689, "wind_gust_speed_60": 11689, "sunshine_30": 11689, "sunshine_60": 11689}, "icon": "cloudy"}, "sources": [{"id": 42212, "dwd_station_id": "13696", "observation_type": "synop", "lat": 51.5966, "lon": 7.40484, "height": 60.0, "station_name": "Waltrop-Abdinghof", "wmo_station_id": "H443", "first_record": "2022-02-03T15:30:00+00:00", "last_record": "2022-02-04T21:00:00+00:00", "distance": 2523.0}, {"id": 11689, "dwd_station_id": "01303", "observation_type": "synop", "lat": 51.4041, "lon": 6.96774, "height": 150.0, "station_name": "Essen-Bredeney", "wmo_station_id": "10410", "first_record": "2022-02-03T15:30:00+00:00", "last_record": "2022-02-04T21:00:00+00:00", "distance": 34639.0}]}
jsonbashfilter


Solution 1:[1]

With the JSON- (and HTML/XML) parser you can do:

$ xidel -s "https://api.brightsky.dev/current_weather?lat=51.58&lon=7.38" \
  -e '$json/weather/temperature' \         # XPath notation
  -e '($json).weather.temperature' \       # dot notation
  -e '($json)("weather")("temperature")'   # JSONiq notation
4.9
4.9
4.9

And as xidel can open urls there's no need for curl.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Reino

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