Reading file line by line may seem like a trivial problem, but in node, there is no straightforward way to do it. There are a lot of libraries using Transform Streams to achieve it, but it seems like a overkill, so I've wrote simple version using only the
filesystem module of node. Note that this is synchronous library.
npm install n-readlines
new readlines(filename, [options]);
new readlines(fd, [options]);
filename- String path to the file you want to read from
fd- File descriptor
readChunk- Integer number of bytes to read at once. Default: 1024
newLineCharacter- String new line character, only works with one byte characters for now. Default:
node-readlines can handle files without newLineCharacter after the last line
buffer with the line data without the
false if end of file is reached.
Resets the pointer and starts from the beginning of the file. This works only if the end is not reached.
Manually close the open file, subsequent
next() calls will return false. This works only if the end is not reached.
const lineByLine = ;const liner = './test/fixtures/normalFile.txt';let line;let lineNumber = 0;while line = linernextconsole;lineNumber++;console;