json2csvexporter
v0.5.1
Published
A simple JSON to CSV converter.
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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:
- Simple Example
- Example with Custom Options
- Example with TSV and Formatters
- JSON to CSV/TSV encoded String/Blob (without downloading on the client)
- API and Options Docs
- Browsers Support
- 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.
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:
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.
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:
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.
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:
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)
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:
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
Options
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 istext/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.
API
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
- Submit issues or suggest features.
- Send PRs with bug fixes, tests, new methods, better docs etc.
- Share the love!