NodeJS creating File but without text

Question

Hey here is my little script:

for (let i = 0; i < test.length; i++) {
        if(publicKey.startsWith(test[i])) {
            console.log(seed + " =[HIT]= " + publicKey)
            fs.appendFile(publicKey.toString() + '.txt', mnemonic.toString(), function (err) {
                if (err) throw err;
                console.log('Finished!');
              });
              exit();

        } else {
            console.log(seed + " =[FAILED]= " + publicKey)
        }
    }

It does create my file but without any text? I tried to put in random text, but it did not work either. Is there a way to fix this?

Jeremy Thille · Accepted Answer · 2022-01-07 16:35:06Z

2

for is synchronous, but fs.writeFile isn't. You are immediately launching several fs.writeFile at a time, all the commands are over even before your hard disk woke up and realised what happened.

Either use the synchronous version fs.writeFileSync(...); (not recommended), or use the Promise version and await it :

import * as fs from 'node:fs/promises';

for (let t of test) {
  if (publicKey.startsWith(t)) {
    console.log(seed + " =[HIT]= " + publicKey);
    await fs.appendFile(publicKey.toString() + '.txt', mnemonic.toString());
  } else {
    console.log(seed + " =[FAILED]= " + publicKey)
  }
}

console.log('Finished!');
process.exit();

edited Jan 7, 2022 at 16:35

answered Jan 7, 2022 at 16:29

Jeremy Thille

26.4k12 gold badges48 silver badges64 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

jarmod Over a year ago

May need break if the original intention was to write the first, and only the first, matching public key.

ossiHQ Over a year ago

It worked thank you sir!

Collectives™ on Stack Overflow

NodeJS creating File but without text

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related