Read the json and store the key as bash variables [duplicate] - json

Question

This question already has answers here:
Exporting JSON to environment variables
(7 answers)
Closed 1 year ago.
I am trying to read the json file and store the keys as bash variable and the values as variable value. For instance here is my test.json:
{
"Day":'0',
"num":'85',
"Qtr":"[20183, 20184, 20191, 20192]",
"pSize":"75"
}
I need to store the variables like this in a bash file:
$Day=0
$num=85
$Qtr=[20183, 20184, 20191, 20192]
$psize=75
I found a way to extract the value using jq, but I am unable to store the key as variable in bash
-bash-4.2$ Qtr=`jq .Qtr test.json`
-bash-4.2$ echo $Qtr
"[20183, 20184, 20191, 20192]"
Could someone please provide a snippet as to how to loop through a json file and store the key as variables and values as values?
Thank you in advance

Answer 1

Would you please try the following:
#!/bin/bash
while IFS== read key value; do
printf -v "$key" "$value"
done < <(jq -r 'to_entries|map("\(.key)=\(.value|tostring)")|.[]' test.json)
# test of the variables
echo "Day: $day"
echo "Qtr: $Qtr"
echo "num: $num"
echo "pSize: $pSize"
The jq command jq -r 'to_entries|map("\(.key)=\(.value|tostring)")|.[]' test.json converts the json object into key=value pairs.
The output of jq is fed to the while loop via the process substitution
<(command).
The -v varname option to the printf command assigns the variable
indirecly expressed with varname to the output.