json2csvexporter

This is a simple little library for exporting simple JSON structures to a CSV file. The download will trigger the user to save the file to their system. The library itself does not handle any File I/O.

Currently, json2csvexporter does not support nested JSON data. As such, you will probably need to reduce complex structures into a simple key: value schema.

To install:

npm i json2csvexporter --save

Provided are:
* umd-formatted file: dist/CSVExportService.js (browser-ready)
* commonjs-formatted file: lib/CSVExportService.js
* es-module: module/CSVExportService.js

Table of contents:

1. Simple Example
2. Example with Custom Options
3. Example with TSV and Formatters
4. JSON to CSV/TSV encoded String/Blob (without downloading on the client)
5. API and Options Docs
6. Browsers Support
7. Contributing

Simple Example

In this simple example we take a JSON object and print all of the properties in it to the CSV. There is also an online demo available via CodeSandbox.

``javascript
import CSVExportService from 'json2csvexporter';
...
const vehiclesJSON = [
{id: 1, make: 'Toyota', model: 'Corolla', year: 2014},
{id: 2, make: 'Ford', model: 'Mustang', year: 2012},
{id: 3, make: 'Toyota', model: '', year: ''}
];
const exporter = CSVExportService.create();
exporter.downloadCSV(vehiclesJSON);
`

This will generate the following CSV:

`csv
id,make,model,year
1,Toyota,Corolla,2014
2,Ford,Mustang,2012
3,Toyota,,
`

Example with Custom Options

In this example, we will take the same JSON object from the previous example, but only print a list of properties that we want. We will also decorate the headers with different names.

`javascript
import CSVExportService from 'json2csvexporter';
...
const csvColumnsList = ['id', 'make', 'model', 'year'];
const csvColumnsMap = {
id: 'ID',
make: 'Make',
model: 'Model Name',
year: 'Year'
};
const vehiclesJSON = [
{id: 1, make: 'Toyota', model: 'Corolla', year: 2014},
{id: 2, make: 'Ford', model: 'Mustang', year: 2012},
{id: 3, make: 'Toyota', model: '', year: ''}
];
const exporter = CSVExportService.create({
columns: csvColumnsList,
headers: csvColumnsMap,
includeHeaders: true,
});
exporter.downloadCSV(vehiclesJSON);
`
This will generate the following CSV:

`csv
ID,Make,Model Name,Year
1,Toyota,Corolla,2014
2,Ford,Mustang,2012
3,Toyota,,
`

Example with TSV and Formatters

In this example, we will make a TSV file and create formatting functions to style the content of certain properties.

`javascript
import CSVExportService from 'json2csvexporter';
...
// using the same vehiclesJSON as before...

const exporter = CSVExportService.create({
contentType: 'text/tsv',
filename: 'newformat.tsv',
delimiter: '\t',
formatters: {
id: (id) => {
return #${id};
},
model: (model) => {
return model || 'Unknown model';
},
year: (year) => {
return year || 'Unknown year';
}
}
});
exporter.downloadCSV(vehiclesJSON);

`

This will generate the following TSV:

`tsv
id make model year
#1 Toyota Corolla 2014
#2 Ford Mustang 2012
#3 Toyota Unknown model Unknown year
`

JSON to CSV/TSV encoded String/Blob (without downloading on the client)

`javascript
import CSVExportService from 'json2csvexporter';
...
const vehiclesJSON = [
{id: 1, make: 'Toyota', model: 'Corolla', year: 2014},
{id: 2, make: 'Ford', model: 'Mustang', year: 2012},
{id: 3, make: 'Toyota', model: '', year: ''}
];
const exporter = CSVExportService.create();
exporter.dataToString(vehiclesJSON);
`

This will return the CSV as a JavaScript String. This allows you to further manipulate the data, save to a file, a database or anything else.

Similarly, calling:

`javascript
exporter.createCSVBlob(vehiclesJSON);
`

Will return a Blob {size: 76, type: "text/csv"}, or in other words, a regular JavaScript blob object that is encoded as the type you specified (in this case a plain text/csv). You then manipulate this Blob object however you like.

API and Options Docs

$3

When creating a new CSVExportService you can pass in an options objects. These are the options that you can use:

- columns: an Array of Strings. Each element represents a property of the JSON object that should be extracted. If it is not provided, then the exporter will iterate through all of the properties.

- contentType: the content type of the file. Default is text/csv

- delimiter: the delimiter to separate values. The default is a comma.

- formatters: an Object. Each property defines how to format a value corresponding to the same key.

- headers: an Object. Works as a map to stylize keys in the header. E.g. {firstName: 'First Name'}

- includeHeaders: a Boolean. Defaults to true.

- devMode: a Boolean. Useful for debugging. Defaults to false.

$3

The CSVExportService implements two static methods: create(options) which returns a new instance of CSVExportService and download(data, options)` which initializes a new service and downloads the data right away.

For more info, dive into the code. It is a very simple class.

Browsers Support

|
IE / Edge |
Firefox |
Chrome |
Safari |
Opera |
iOS Safari |
| --------- | --------- | --------- | --------- | --------- | --------- |
| IE10, IE11, Edge| 4+ | 13+ | 5+ | 12+ | 7+ |

Contributing

1. Submit issues or suggest features.
2. Send PRs with bug fixes, tests, new methods, better docs etc.
3. Share the love!

Contributor list

1. @filipdanic
2. @androidfanboi
3. @erickzhao
4. @bira91