Update value of a json file

Hello everyone
I need to update a value in a json file (code_client)
{
“key_api” :“xxxx”,
“code_client” :“”,
“msisdn” :“aaaaa”,
“nom_signataire” :“yyyy”
}
it should’nt be empty like it is in the json file it should be attributed in an assign activity.
Please help me it is urgent

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Thank you
Worked like a charm

Duplicate of Update json value