To convert output to json, use the --output-format=json (or -o=j) flag. You can change the json output format by using the indent flag.
Given a sample.yaml file of:
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b:
2
c:2
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then
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yq eval -o=j sample.yaml
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will output
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{
2
"b":{
3
"c":2
4
}
5
}
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To format the json:
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yq eval -o=j -I=0 sample.yaml
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will yield
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{"b":{"c":2}}
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Multiple matches
Each matching yaml node will be converted to json and printed out as a separate json doc. You may want to set the indent flags to 0 if you want a json doc per line.
Given a sample.yaml file of:
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bob:
2
c:2
3
bab:
4
c:5
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then
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yq eval -o=j '.b*' sample.yaml
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will output
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{
2
"c":2
3
}
4
{
5
"c":5
6
}
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Json to Yaml
To read in json, just pass in a json file instead of yaml, it will just work - as json is a subset of yaml. However, you will probably want to use the Style Operator or --prettyPrint/-P flag to make look more like an idiomatic yaml document. This can be done by resetting the style of all elements.
e.g given a json file
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{"a":"Easy! as one two three","b":{"c":2,"d":[3,4]}}