How to create a json file with jq - json

Question

Now I am trying to make a json file.
I found an example which is with jq.
echo "$(jq -n '{Test1: $ARGS.named}' \
--arg one 'Apple' \
--arg two 'Banana')" >> config.json
I can get the result and save it into config.json
{
"Test1": {
"one": "Apple",
"two": "Banana"
}
}
Now, how to make the following result and save it.
{
"Test1": {
"one": "Apple",
"two": "Banana"
},
"Test2": {
"one": "Kiwi",
"two": "Tomato"
}
}
Thanks

Answer 1

Create a JSON file:
$ jq -n --arg one 'Apple' --arg two 'Banana' \
'{Test1: $ARGS.named}' > config.json
View the JSON file:
$ cat config.json
{
"Test1": {
"one": "Apple",
"two": "Banana"
}
}
Create another JSON file based on the first one (using jq's . for the input object, and + to add (merge) two objects):
$ jq --arg one 'Kiwi' --arg two 'Tomato' \
'. + {Test2: $ARGS.named}' config.json > config2.json
View that other JSON file:
$ cat config2.json
{
"Test1": {
"one": "Apple",
"two": "Banana"
},
"Test2": {
"one": "Kiwi",
"two": "Tomato"
}
}
Overwrite the first one with the second one:
$ mv config2.json config.json
Now the first one has the content of the second one:
$ cat config.json
{
"Test1": {
"one": "Apple",
"two": "Banana"
},
"Test2": {
"one": "Kiwi",
"two": "Tomato"
}
}

Answer 2

Without creating a temporary file, assuming your shell is POSIX-based:
{
jq -cn --arg one 'Apple' --arg two 'Banana' '{Test1: $ARGS.named}'
jq -cn --arg one 'Kiwi' --arg two 'Tomato' '{Test2: $ARGS.named}'
} | jq -s add > output.json
Or
jq -n \
--argjson Test1 "$(jq -n --arg one 'Apple' --arg two 'Banana' '$ARGS.named')" \
--argjson Test2 "$(jq -n --arg one 'Kiwi' --arg two 'Tomato' '$ARGS.named')" \
'$ARGS.named' > output.json
If this is a prelude to a list of "TestN" objects, we'll get a bit more programmitic, here with bash syntax:
ones=( Apple Kiwi )
twos=( Banana Tomato )
for ((i=0; i < ${#ones[#]}; i++)); do
jq -cn \
--arg one "${ones[i]}" \
--arg two "${twos[i]}" \
--arg key "Test$((i + 1))" \
'{($key): {$one, $two}}'
done | jq -s add > output.json
Or, use a different tool: jo
jo Test1="$(jo one=Apple two=Banana)" Test2="$(jo one=Kiwi two=Tomato)"
{"Test1":{"one":"Apple","two":"Banana"},"Test2":{"one":"Kiwi","two":"Tomato"}}