CODE EXAMPLE FOR JAVASCRIPT

export from json

const http = require('http')
const exportFromJSON = require('export-from-json')

http.createServer(function (request, response){
    // exportFromJSON actually supports passing JSON as the data option. It's very common that reading it from http request directly.
    const data = '[{"foo":"foo"},{"bar":"bar"}]'
    const fileName = 'download'
    const exportType = 'txt'

    const result = exportFromJSON({
        data,
        fileName,
        exportType,
        processor (content, type, fileName) {
            switch (type) {
                case 'txt':
                    response.setHeader('Content-Type', 'text/plain')
                    break
                case 'css':
                    response.setHeader('Content-Type', 'text/css')
                    break
                case 'html':
                    response.setHeader('Content-Type', 'text/html')
                    break
                case 'json':
                    response.setHeader('Content-Type', 'text/plain')
                    break
                case 'csv':
                    response.setHeader('Content-Type', 'text/csv')
                    break
                case 'xls':
                    response.setHeader('Content-Type', 'application/vnd.ms-excel')
                    break
            }
            response.setHeader('Content-disposition', 'attachment;filename=' + fileName)
            return content
        }
    })

    response.write(result)
    response.end()
}).listen(8080, '127.0.0.1')