Update Json content with javascript

Question

Hello guys I got some Problems wiht my Json File

The Filename is name.json

{   
    "name": "Gerald"
}

How can I Change the name to "Gandalf" with a function in Javascript

function changeNameJson(name){
  let filename= "./name.json";
  let file = fs.readFileSync(filename, 'utf8');
  let nameAtTheTime = JSON.parse(file);
  let newName=name;
}

I tried to find a Solution but i couldn't.

Your function is incomplete, it doesn't make any changes to the json. You need something like nameAtTheTime.name = name to assign the property. You then need to return the nameAttheTime object to the function caller to do something else, or write it back to a file. — user4815162342
– user4815162342, Commented Jan 4, 2023 at 16:28

mahooresorkh · Accepted Answer · 2023-01-04 16:06:13Z

1

You can modify the function like this:

function changeNameJson(name){
    let filename= "./name.json";
    let file = fs.readFileSync(filename, 'utf8');
    let nameAtTheTime = JSON.parse(file);
    nameAtTheTime.name = name;
}

And if you want to save the change into name.json file, add this to the end of changeNameJson function body :

fs.writeFileSync("./name.json",JSON.stringify(nameAtTheTime));

Or if you want to make name.json file content prettier:

fs.writeFileSync("./name.json",JSON.stringify(nameAtTheTime,null,2));

edited Jan 4, 2023 at 16:06

answered Jan 4, 2023 at 14:52

mahooresorkh

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