Use sed with jq in bash script

Question

How to use sed with jq to replace _ in key name with symbol a

{ "product_name":"kl" }

should become

{ "productaname":"kl" }

in a bash script

Answer 1

No need for sed ; it's easy to do in just jq :

$ jq '{ productaname: .product_name }' <<<'{ "product_name":"kl" }'
{"productaname":"kl"}

If you want to replace underscores with a's in all keys of an object:

$ jq 'with_entries(.key |= gsub("_"; "a"))' <<<'{ "product_name":"kl", "foo_bar":12 }'
{"productaname":"kl","fooabar":12}

From the documentation for with_entries :

to_entries, from_entries, with_entries

These functions convert between an object and an array of key-value pairs. If to_entries is passed an object, then for each k: v entry in the input, the output array includes {"key": k, "value": v} .

from_entries does the opposite conversion, and with_entries(foo) is a shorthand for to_entries | map(foo) | from_entries to_entries | map(foo) | from_entries to_entries | map(foo) | from_entries , useful for doing some operation to all keys and values of an object. from_entries accepts key, Key, name, Name, value and Value as keys.