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jsonlines

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jsonlines

Parse [JSONLines](http://jsonlines.org) with Node.js.

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What is jsonlines?

The jsonlines npm package is used for reading and writing JSON Lines, a format for storing structured data that is easy to process one record at a time. Each line in a JSON Lines file is a valid JSON value, separated by newline characters.

What are jsonlines's main functionalities?

Reading JSON Lines

This code demonstrates how to read a JSON Lines file using the jsonlines package. It creates a readable stream from an input file and pipes it to the jsonlines parser. The parser emits 'data' events for each parsed JSON object.

const jsonlines = require('jsonlines');
const fs = require('fs');

const input = fs.createReadStream('input.jsonl');
const reader = jsonlines.parse();

input.pipe(reader);

reader.on('data', (obj) => {
  console.log('Parsed object:', obj);
});

reader.on('end', () => {
  console.log('Finished reading file.');
});

Writing JSON Lines

This code demonstrates how to write JSON objects to a JSON Lines file using the jsonlines package. It creates a writable stream to an output file and pipes it to the jsonlines stringifier. JSON objects are written to the stringifier, which then writes them to the file.

const jsonlines = require('jsonlines');
const fs = require('fs');

const output = fs.createWriteStream('output.jsonl');
const writer = jsonlines.stringify();

writer.pipe(output);

writer.write({ foo: 'bar' });
writer.write({ baz: 'qux' });
writer.end();

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Package last updated on 14 Jun 2017

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