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# Split (matcher) [](http://travis-ci.org/dominictarr/split) Break up a stream and reassemble it so that each line is a chunk. matcher may be a `String`, or a `RegExp` Example, read every line in a file ... ``` js fs.createReadStream(file) .pipe(split()) .on('data', function (line) { //each chunk now is a separate line! }) ``` `split` takes the same arguments as `string.split` except it defaults to '/\r?\n/' instead of ',', and the optional `limit` parameter is ignored. [String#split](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/split) `split` takes an optional options object on its third argument. ``` js split(matcher, mapper, options) ``` Valid options: * maxLength - The maximum buffer length without seeing a newline or `matcher`, if a single line exceeds this, the split stream will emit an error. ``` js split(JSON.parse, null, { maxLength: 2}) ``` * trailing - By default the last buffer not delimited by a newline or `matcher` will be emitted. To prevent this set `options.trailing` to `false`. ``` js split(JSON.parse, null, { trailing: false }) ``` ## keep matched splitter As with `String#split`, if you split by a regular expression with a matching group, the matches will be retained in the collection. ``` stdin .pipe(split(/(\r?\n)/)) ... //lines + separators. ``` # NDJ - Newline Delimited Json `split` accepts a function which transforms each line. ``` js fs.createReadStream(file) .pipe(split(JSON.parse)) .on('data', function (obj) { //each chunk now is a a js object }) .on('error', function (err) { //syntax errors will land here //note, this ends the stream. }) ``` # License MIT