Count the number of key value pairs in a given JSON structure using jq-CodePudding

Given a JSON structure that looks similar to this:

{
  "foo": "bar",
  "baz": 5,
  "qux": false
}

How do I find out how many key value pairs are in it? In JavaScript I could call Object.keys(myJson).length to get the result, but it would be much more convenient for me to do it with jq directly.

CodePudding user response：

Just use length directly on the object.

From the manual:

The length of an object is the number of key-value pairs

{"foo":"bar", "baz":5, "qux":false} | length

Demo

CodePudding user response：

You can use jq 'keys | length', which will do exactly the same as Object.keys(myJson).length.

CodePudding user response：

If the object is the input to JQ, then simply length:

echo '{"a":4,"b":2}' | jq 'length'