How can I extract object values from nested JSON and do the assertions for the same

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My question:
Hi Team ,I am new API testing in postman could you please help me to find a solution for my question
How can I extract object values from nested JSON and do the assertions for the same

{

"Language": "du",
"key": "EU",
"languages": [
    "de",
    "en",
 ],
"name": {
    "de": "EU",
    "en": "EU",
    "it": "EU",
    "fr": "EU",
},

}

This is the json response and here i want to get and store all the key and values under “name” object and have to validate if the values are matching