Awesome

rollup-plugin-jsonlines

🍣 A Rollup plugin which imports .jsonl (JSON Lines) files as JSON arrays.

Requirements

This plugin requires an LTS Node version (v14.0.0+) and Rollup v1.20.0+.

Install

Using npm:

npm install rollup-plugin-jsonlines --save-dev

Usage

Create a rollup.config.js configuration file and import the plugin:

import jsonl from 'rollup-plugin-jsonlines';

export default {
  input: 'src/index.js',
  output: {
    dir: 'output',
    format: 'cjs'
  },
  plugins: [jsonl()]
};

Then call rollup either via the CLI or the API.

Usage with vite

vite.config.js

import { defineConfig } from 'vite';
import { svelte } from '@sveltejs/vite-plugin-svelte';
import jsonl from 'rollup-plugin-jsonlines';

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [svelte(), jsonl()]
});

Example

fruits.jsonl

{ "type": "apples", "count": 7 }
{ "type": "pears", "count": 4 }
{ "type": "bananas", "count": 5 }

index.js

import fruit from './fruits.jsonl';

console.log(fruit);

log

[
  { "type": "apples", "count": 7 },
  { "type": "pears", "count": 4 },
  { "type": "bananas", "count": 5 }
]

Options

ignoreErrors

Type: Boolean<br> Default: false

If set to false (default), an exception will be thrown in case of invalid JSON on a line.

If set to true, invalid lines will be omitted.

processRow

Type: Function<br> Default: null

Specifies a function which processes each row in the parsed array. The function can either manipulate the passed row, or return an entirely new row object.

This option could be used for converting numeric string values into Number values. – for example turning numeric values into numbers, e.g.

jsonl({
  processRow: (row, id) => {
    Object.keys(row).forEach((key) => {
      var value = row[key];
      row[key] = isNaN(+value) ? value : +value;
    });
  }
});