how to append to a file on particular position using node.js? [closed]

Answer 1

Refer this link

Using this you can write to a specific position in a file.

Code snippet:

var position = 5;
var file_path = 'file.txt';
var new_text = 'abcde';

fs.readFile(file_path, function read(err, data) {
    if (err) {
        throw err;
    }
    var file_content = data.toString();
    file_content = file_content.substring(position);
    var file = fs.openSync(file_path,'r+');
    var bufferedText = new Buffer(new_text+file_content);
    fs.writeSync(file, bufferedText, 0, bufferedText.length, position);
    fs.close(file);
});

The file.txt should be on the same path.

file.txt already contains this text: OldText

Output: The new text will be OldTeabcdext i.e, OldTeabcdext