Node Js saving File but no content

Question

I have a little problem with node js.

If I save a file with fs.writeFile it saves but the file has no content, but if I read the file and print the content there is content in the file

Thats the node js code to save the file:

let sjson = JSON.parse(fs.readFileSync("./saves/User_VipList.json", "utf8"));
    sjson['users'].push({"name": args[0]});
    fs.writeFile("./saves/User_VipList.json", JSON.stringify(sjson), (err) => {
      if(err) throw err;
      
    });

Thats how i read the content:

let sjson = JSON.parse(fs.readFileSync("./saves/User_VipList.json", "utf8"));
    console.log(sjson);

And that's the JSON file:

{
    "users": []
}

But in users should be content because

Hope you guys can help me

Do i need permissions for node js in Windows and if its needed how do i set it :)? — Tobias Staffel, Jul 20 '20 at 08:53
I thought your are using linux. Did you try to push a sample data like sjson['users'].push({"name": "john"}); if still not solve the problem remove "" in your name property just {name: "john"}, maybe its a json error — thegreytangent, Jul 20 '20 at 09:27
I think you need to use readFileCallback, experiment with this [ https://stackoverflow.com/questions/36856232/write-add-data-in-json-file-using-node-js ] — thegreytangent, Jul 20 '20 at 09:52

score 0 · Answer 1 · answered Jul 20 '20 at 08:57

0

Due to async nature looks like your program doesnt wait when file write ends occurs, so please try to use fs.writeFileSync instead, for example:

try {
  fs.writeFileSync("./saves/User_VipList.json", JSON.stringify(sjson))
} catch(err) {
  console.log('Error writing file:', err)
}

answered Jul 20 '20 at 08:57

Denisix

106
1

Seems like this didn't fix it file is still empty. but there is still output with content. – Tobias Staffel Jul 20 '20 at 09:05
try to check what content in `sjson`, and after stringify by inserting `console.log(sjson)` and `console.log(JSON.stringify(sjson))` before fs.writeFileSync – Denisix Jul 20 '20 at 09:58

score -1 · Answer 2 · answered Jul 20 '20 at 10:00

Found the Problem

Oh i think i found the problem if i start node index.js with a bat file the problem happends but if i start node manually over cmd it works.

Didn't mention the Bat file because i didn't think thats could be a problem :)

But why is that a problem?

Node Js saving File but no content

2 Answers2