appendFile.md

appendFile(filePath, data, options)

Append data to a file asynchronously. This method wraps writeFile with the append ('a') flag, allowing new data to be added at the end of the file seamlessly.

Alias: appendFile()

Parameters:

• filePath <string>
• data <string> | <Buffer> | <Object> | <Unit8Array>
• Returns: Promise<any>

Example

const fs = require('fsmate');

const file = '/tmp/dir/subdir/file.txt';
const data = 'Hello World!';

// With Promises:
fs.appendFile(file, data)
.then(() => {
  console.log('success');
}).catch(e => {
  console.log(e);
});

// With async/await:
async function appendFile(f, content) {
  try {
    await fs.appendFile(f, content);
    console.log('success');
  } catch(err) {
    console.log(err);
  }
}

appendFile(file, data);

For the synchronous version, see: appendFileSync