Javascript同步写入文件和读取文件

Question

I have a need to store data in variable, store whole variable to a file and then read it from a file.

How to achieve that with Java script?

Tried with:

fs.writeFileSync('/tmp/data.txt', JSON.stringify(objectData));
fs.readFile('/tmp/data.txt', (err, data) => {
  if (err) throw err;
  console.log(data);
});

But second part is executing before file write finishes giving either corrupted data or partial one.

How to achieve above scenario?

Answer 1

I think in your case it's better if you use fs.writeFile as described here , to ensure if your write has been done and then read your file:

fs.writeFile('/tmp/data.txt', JSON.stringify(objectData), (err) => {
  if (err) throw err;
  console.log('The file has been saved!');
fs.readFile('/tmp/data.txt', (err, data) => {
  if (err) throw err;
  console.log(data);
});
});