I can't fetch a user's permsissions from a server

[Scarner56]

Please describe the problem you are having in as much detail as possible:
Trying to fetch a user's permissions from a server
Include a reproducible code sample here, if possible:

app.get("/yonet", async(req, res) => {
  if(!req.user) return res.redirect("/hata?type=giris")
  let id = req.query.server
  if(!id) return res.redirect("/hata?type=bulunamadı")
  let p =  new Promise(async (resolve, reject) => {
    let sunucu = await client.guilds.cache.get(id)
    let a = await sunucu.members.cache.get(req.user.id)
    console.log(a)
    if(a.permissions.has("MANAGE_GUILD")){
      resolve()
    }else {
      reject()
    }
    p.then((pe) => {
      console.log(pe)
    })
  }) 
    renderTemplate(res, req, "yonet/server.ejs", {id})

The errorr

    if(a.permissions.has("MANAGE_GUILD")){
         ^

TypeError: Cannot read property 'permissions' of undefined

Further details:

• discord.js version: 13.1.0
• Node.js version: 16+
• Operating system: ubuntu 18
• Priority this issue should have – please be realistic and elaborate if possible:

Relevant client options:

• partials: none
• gateway intents: server members
• other: none

[Scarner56]

Btw i asked this error on discord and no one else found solution

[Jiralite]

This doesn't seem like a bug, but a lack of understanding. Feel free to make a new discussion about it, as this issue tracker is for bug reports and enhancement suggestions.

[Scarner56]

Should i close this issue?

[kyranet]

Don't worry, I can just do this.

[Jiralite]

Okay, there are a lot of problems here.

1. The provided reproducible code sample doesn't work. It should be something that we can copy & paste to test ourselves to see the error. It's also incorrect syntax.
2. p is defined as a Promise, but the code in there doesn't need it to be. You also include a reference to itself in there.
3. You have unnecessary awaits here:

let sunucu = await client.guilds.cache.get(id)
let a = await sunucu.members.cache.get(req.user.id)

These methods don't return a Promise (which adds to point 2).

4. You specify the "server members" intent which doesn't exist - I assume you mean the GUILD_MEMBERS one. I feel like you should be including GUILDS too.

After all of this, I assume the problem is that your member is not cached. Code needs tidying!