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json2csv-stream
Advanced tools
Readme
Transform json to csv data. The difference to my other module
json2csv is json2csv-stream
uses streams for transforming the incoming
data. The module is built with the new streaming API from Node.js v0.10.0 but maintains backwards compatibility
to earlier Node.js versions.
Listen for header
and line
events or pipe the data directly to a readable stream.
Install with
$ npm install json2csv-stream
Input - data.json
[
{"car": "Audi","price": 40000,"color": "blue"},
{"car": "BMW","price": 35000,"color": "black"},
{"car": "Mercedes","price": 80000,"color": "red"},
{"car": "Porsche","price": 60000,"color": "green"}
]
Transformation process
var fs = require('fs');
var MyStream = require('json2csv-stream');
// create the transform stream
var parser = new MyStream();
// create the read and write streams
var reader = fs.createReadStream('data.json');
var writer = fs.createWriteStream('out.csv');
reader.pipe(parser).pipe(writer);
Output - out.csv
car,price,color
Audi,40000,blue
BMW,35000,black
Mercedes,80000,red
Porsche,60000,green
header
and line
eventsIf you want to further manipulate your data listen on the custom events.
parser.on('header', function(data) {
console.log(' ++ yeah header found ++');
console.log(data);
});
parser.on('line', function(data) {
console.log(' ++ yeah line found ++');
console.log(data);
});
var MyStream = require('json2csv-stream');
// create the parsing stream with default options
var parser = new MyStream();
// create the stream with custom options. All options are optional.
var parser = new MyStream(options);
The following options are supported
del
: Delimiter for csv values. Default is ,
.keys
: Specify the keys you'd like to output. In the default setting all keys are exported.eol
: End-of-line marker. Default is the one used by the operating system.showHeader
: If you don't want the header line in your csv set to false
. Default is true
.The default delimiter is ,
(comma). If you want to have tab-seperated values \t
or
semilocon-seperated values ;
you can specify an optional delimiter using the del
property.
var parser = new MyStream({
del: ';'
});
You can specify which key-value pairs you'd like to include in your .csv
file. Use the keys
property.
var parser = new MyStream({
keys: ['car', 'color']
});
The default end-of-line marker is os.eol
. That means \n
on unix systems and \r\n
on windows machines.
You can specify your own end-of-line markers with the eol
property in the options.
var parser = new MyStream({
eol: '\r\n'
});
If you want your csv data without the header line set showHeader
to false
;
var parser = new MyStream({
showHeader: false
});
Go into the /benchmark
folder and run
$ node benchmark.js
Results:
Executed benchmark against node module: "json2csv-stream"
Count (34), Cycles (3), Elapsed (6.179 sec), Hz (563.3422353498144 ops/sec)
Executed benchmark against node module: "json2csv"
Count (38), Cycles (5), Elapsed (6.241 sec), Hz (652.5024167610189 ops/sec)
Module: "json2csv" wins.
You need to have grunt-cli installed.
$ grunt test
or
$ npm test
Copyright (C) 2012 [Mirco Zeiss](mailto: mirco.zeiss@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
FAQs
Transform stream data from json to csv
The npm package json2csv-stream receives a total of 478 weekly downloads. As such, json2csv-stream popularity was classified as not popular.
We found that json2csv-stream demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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