Nested array within nested object
You can chain a second map and obtain the desired result. But my answer assumes that the arrays only have a single item in them.
Also, I didn't quite understand what you wanted to do with the buttons so I've kept them as an array.
You can run the snippet below to see if you're getting the desired output.
const data={message:"fetch responces successfully",responce:[{created_AT:"Mon, 03 Jan 2022 17:39:24 GMT",created_BY:"avinash",dateTime:"Mon, 03 Jan 2022 17:39:24 GMT",deleted_BY:"",flag:0,project_ID:"infobot1234",responce:{uttence_test_heading:[{buttons:[{payload:"/my_localities",title:"savings",},{payload:"/my_localities12333qqqwq",title:"current",},{payload:"/fruits",title:"platinum",},],},{title:"Test Heading",},],},responce_ID:"6bbb20d6-7f71-408a-a78a-bab39a30016f",responce_name:"uttence_test_heading",updated_BY:"",user_ID:"av1234",},{created_AT:"Tue, 04 Jan 2022 17:49:36 GMT",created_BY:"avinash",dateTime:"Tue, 04 Jan 2022 17:49:36 GMT",deleted_BY:"",flag:0,project_ID:"infobot1234",responce:{utter_content:[{text:"text_title for buttonqwqwq",},],},responce_ID:"81d699ee-3e78-4356-b703-af095d91e36b",responce_name:"utter_txt1234",updated_BY:"",user_ID:"av1234",},{created_AT:"Thu, 13 Jan 2022 18:06:39 GMT",created_BY:"avinash",dateTime:"Thu, 13 Jan 2022 18:06:39 GMT",deleted_BY:"",flag:0,project_ID:"infobot1234",responce:{uttence_text_heading:[{buttons:[{payload:"/my_localities",title:"savings",},{payload:"/my_localities12333qqqwq",title:"current",},{payload:"/test",title:"premium",},],},{title:"Text Heading",},],},responce_ID:"bb6b0005-bbd4-49a1-8b25-58e0768800a1",responce_name:"uttence_text_heading",updated_BY:"",user_ID:"av1234",},{created_AT:"Thu, 13 Jan 2022 20:13:54 GMT",created_BY:"avinash",dateTime:"Thu, 13 Jan 2022 20:13:54 GMT",deleted_BY:"",flag:0,project_ID:"infobot1234",responce:{uttence_heading_test:[{buttons:[{payload:"/my_localities",title:"savings",},{payload:"/fruits",title:"current",},{payload:"/undefined",title:"premium",},],},{title:"heading test",},],},responce_ID:"7aeb2a42-a5f8-464d-832d-47cee4cfdb38",responce_name:"uttence_heading_test",updated_BY:"",user_ID:"av1234",},],status_code:0,}
const result = data.responce
.map((res) => ({...res.responce, responce_ID: res.responce_ID }))
.map((obj) => ({
utterance_name: Object.keys(obj)[0],
text: Object.values(obj)[0][0].text || "",
buttons: Object.values(obj)[0][0].buttons?.map((btn) => btn.title) || "",
responce_ID: obj.responce_ID
}));
console.log(result);