how to add json object to json file using shell script

Question

json file as follows:

{\"name\" :\"sam\",
\"age\":23,
\"designation\":\"doctor\"}

now i want to add another json object {\"location\":\"can

Answer 1

sed -i '$s/}/,\n"location":"canada"}/' sample.json

Result:

{"name" :"sam",
"age":23,
"designation":"doctor",
"location":"canada"}