jQuery为现有json添加大价值

Question

I have a large existing json object and I'd like to add a new key/value to the object where the value can be very large (many K).

Using jq I can do something like this:

echo $item | jq '. + {readme:"big blob of text"}'

Is there a good way to replace big blob of text with a shell or jq variable?

Answer 1

The following is illustrative of what can be done if your version of jq supports "--argjson". Similar things can be done with --arg and --argfile .

#!/bin/bash

function bigblob {
cat <<EOF 
big blob of text
EOF
}

item='{"a": "a"}'

bigblob | jq -R --argjson item "$item" '$item + {"readme": .}'

Result:

{
  "a": "a",
  "readme": "big blob of text"
}