Adonis PapaParse Provider

A AdonisJS service Provider which wraps Papa Parse, a powerful CSV parser .

installation

Install via npm:

npm i --save adonis-papaparse-provider

Register the provider inside start/app.js file :

const providers = [
  'adonis-papaparse-provider/providers/PapaParseProvider'
]

After register, import the parser as below :

const Papa = use('Papa')

Provider Config

The config file config/papaParse.js contains Papa Parse configuration options :

• parse : configuration for converting CSV to JSON
• unparse : configuration for converting JSON to CSV

Features

The provider exposes base functions of Papa Parse.

Parse CSV to JSON

CSV string :

const Papa = use('Papa')
const csv = `name,age\n\nTom,12\nAmy,9`
let result = Papa.parse(csv)
/*
result.data === [['name', 'age'], [''], ['Tom', '12'], ['Amy', '9']]
*/

Local csv file (fs.readFileSync) :

const Papa = use('Papa')
const csv = path.resolve(__dirname, '../test.csv')
const csvString = fs.readFileSync(csv, 'utf8')
let result = Papa.parse(csvString)

Local CSV file (fs.createReadStream)

const Papa = use('Papa')
const csv = path.resolve(__dirname, '../test.csv')
const stream = fs.createReadStream(csv, 'utf8')

// in async function
const result = await new Promise ((resolve, reject) => {
  Papa.parse(stream, {error:  reject, complete: resolve})
})

Local CSV file (stream.pipe()) :

const Papa = use('Papa')
const csv = path.resolve(__dirname, '../test.csv')
const stream = fs.createReadStream(csv, 'utf8')
const csvStream = stream.pipe(Papa.parse(Papa.NODE_STREAM_INPUT))

// in async function
let result = await new Promise ((resolve, reject) => {
  const data = []
  csvStream.on('error', reject)
  csvStream.on('data', (item) => data.push(item))
  csvStream.on('end', () => {resolve(data)})
})

JSON to Parse CSV

const Papa = use('Papa')

/* Array<Object> */
let json = [{name: 'Tom', age: '12'}, {name: 'Amy', age: '9'}]

/* Array<Array<any>> */
json = [['name', 'age'], [''], ['Tom', '12'], ['Amy', '9']]

/* Papa.UnparseObject */
json = {
  fields: ['name', 'age'],
  data: [['Tom', '12'], ['Amy', '9']]
}

Papa.unparse(json)