Assuming both arrays are ordered correctly this can be achieved likes so.

const links = ['/nft-card', '/landing'] // changed the order so the result is what you want

const incompleteObjects = [{ id: 1, name: 'NFT Preview Card', },{ id: 2, name: 'Remote Landing Page' }]

const completeObjects = incompleteObjects.map((item, idx) => 
  {
    return {
      ...item,
      links: links[idx]
    }
  }

EDIT: adjusted links array order

You can make copy of array 2. This is easy way to do:

let ar1=[ '/landing', '/nft-card' ] 

let ar2=[{ id: 1, name: 'NFT Preview Card', },{ id: 2, name: 'Remote Landing Page' }]


let ar3=[]
for(let i=0;i<ar2.length;i++){
  ar2[i].line=ar1[i];
  }
  console.log(ar2)

if the length of your array and your object array is equal you can use this way:

let array = [ '/landing', '/nft-card' ];
let objectArray = [{ id: 1, name: 'NFT Preview Card', link: "nft-card" },{ id: 2, name: 'Remote Landng Page', link: "landing" }];

  for(let i = 0 ; i < array.length; i++){
  objectArray[i].link = array[i];
}

console.log(objectArray);