You should JSON.parse() the talkjs value.
JSON.parse()
const respose = { data: { talkjs: "{\"message\":{\"id\":\"msg_303fpzqsELNIYT6udk6A52\",\"text\":\"hello\"}}" } }; const talkjs = JSON.parse(respose.data.talkjs); console.log(talkjs.message.text)