CSVtoJSON

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Table of Contents

• Description
• Support for JS & TS
• Prerequisites
• Install npm convert-csv-to-json package
  • Install
  • Usage
    • Generate JSON file
    • Generate Array of Object in JSON format
    • Generate Object with sub array
    • Define field delimiter
    • Trim header field
    • Trim header field with whitespaces
    • Support Quoted Fields
    • Index header
    • Empty rows
    • Format property value by type
      • Number
      • Boolean
    • Encoding
  • Chaining Pattern
• Development
• CI CD github action
• License
• Buy me a Coffee

Description

Converts csv files to JSON files with Node.js.

Give an input file like:

first_name	last_name	email	gender	age	zip	registered
Constantin	Langsdon	clangsdon0@hc360.com	Male	96	123	true
Norah	Raison	nraison1@wired.com	Female	32		false

e.g. :

first_name;last_name;email;gender;age;zip;registered
Constantin;Langsdon;clangsdon0@hc360.com;Male;96;123;true
Norah;Raison;nraison1@wired.com;Female;32;;false

will generate:

1[
2 {
3  "first_name": "Constantin",
4  "last_name": "Langsdon",
5  "email": "clangsdon0@hc360.com",
6  "gender": "Male",
7  "age": "96",
8  "zip": "123",
9  "registered": "true"
10 },
11 {
12  "first_name": "Norah",
13  "last_name": "Raison",
14  "email": "nraison1@wired.com",
15  "gender": "Female",
16  "age": "32",
17  "zip": "",
18  "registered": "false"
19 }
20]

Support for JS & TS

This package is compatible with and .

Prerequisites

NPM (see Installing Npm).

Install npm convert-csv-to-json package

Go to NPM package convert-csv-to-json.

Install

Install package in your package.json

1$ npm install convert-csv-to-json --save

Install package on your machine

1$ npm install -g convert-csv-to-json

Usage

Generate JSON file

1let csvToJson = require('convert-csv-to-json');
2
3let fileInputName = 'myInputFile.csv'; 
4let fileOutputName = 'myOutputFile.json';
5
6csvToJson.generateJsonFileFromCsv(fileInputName,fileOutputName);

Generate Array of Object in JSON format

1let csvToJson = require('convert-csv-to-json');
2
3let json = csvToJson.getJsonFromCsv("myInputFile.csv");
4for(let i=0; i<json.length;i++){
5    console.log(json[i]);
6}

Generate Object with sub array

firstName;lastName;email;gender;age;birth;sons
Constantin;Langsdon;clangsdon0@hc360.com;Male;96;10.02.1965;*diego,marek,dries*

Given the above CSV example, to generate a JSON Object with properties that contains sub Array, like the property sons with the values diego,marek,dries you have to call the function parseSubArray(delimiter, separator) . To generate the JSON Object with sub array from the above CSV example:

1    csvToJson.parseSubArray('*',',')
2                .getJsonFromCsv('myInputFile.csv');

The result will be:

1[
2  {
3      "firstName": "Constantin",
4      "lastName": "Langsdon",
5      "email": "clangsdon0@hc360.com",
6      "gender": "Male",
7      "age": "96",
8      "birth": "10.02.1965",
9      "sons": ["diego","marek","dries"]
10    }
11]

Define field delimiter

A field delimiter is needed to split the parsed values. As default the field delimiter is the semicolon (;), this means that during the parsing when a semicolon (;) is matched a new JSON entry is created. In case your CSV file has defined another field delimiter you have to call the function fieldDelimiter(myDelimiter) and pass it as parameter the field delimiter.

E.g. if your field delimiter is the comma , then:

1 csvToJson.fieldDelimiter(',')
2            .getJsonFromCsv(fileInputName);

Trim header field

The content of the field header is cut off at the beginning and end of the string. E.g. " Last Name " -> "Last Name".

Trim header field with whitespaces

Use the method trimHeaderFieldWhiteSpace(true) to remove the whitespaces in an header field (E.g. " Last Name " -> "LastName"):

1 csvToJson.trimHeaderFieldWhiteSpace(true)
2            .getJsonFromCsv(fileInputName);

Support Quoted Fields

To be able to parse correctly fields wrapped in quote, like the last_name in the first row in the following example:

first_name	last_name	email
Constantin	"Langsdon,Nandson,Gangson"	clangsdon0@hc360.com

you need to activate the support quoted fields feature:

1 csvToJson.supportQuotedField(true)
2            .getJsonFromCsv(fileInputName);

The result will be:

1[
2  {
3      "firstName": "Constantin",
4      "lastName": "Langsdon,Nandson,Gangson",
5      "email": "clangsdon0@hc360.com"
6    }
7]

Index header

If the header is not on the first line you can define the header index like:

1 csvToJson.indexHeader(3)
2            .getJsonFromCsv(fileInputName);

Empty rows

Empty rows are ignored and not parsed.

Format property value by type

If you want that a number will be printed as a Number type, and values true or false is printed as a boolean Type, use:

1 csvToJson.formatValueByType()
2            .getJsonFromCsv(fileInputName);

For example:

1[
2 {
3  "first_name": "Constantin",
4  "last_name": "Langsdon",
5  "email": "clangsdon0@hc360.com",
6  "gender": "Male",
7  "age": 96,
8  "zip": 123,
9  "registered": true
10 },
11 {
12  "first_name": "Norah",
13  "last_name": "Raison",
14  "email": "nraison1@wired.com",
15  "gender": "Female",
16  "age": 32,
17  "zip": "",
18  "registered": false
19 }
20]

Number

The property age is printed as

1 "age": 32

instead of

1  "age": "32"

Boolean

The property registered is printed as

1 "registered": true

instead of

1  "registered": "true"

Encoding

You can read and decode files with the following encoding:

• utf8:

  1 csvToJson.utf8Encoding()
  2            .getJsonFromCsv(fileInputName);

• ucs2:

  1  csvToJson.ucs2Encoding()
  2            .getJsonFromCsv(fileInputName);

• utf16le:

  1  csvToJson.utf16leEncoding()
  2             .getJsonFromCsv(fileInputName);

• latin1:

  1  csvToJson.latin1Encoding()
  2             .getJsonFromCsv(fileInputName);

• ascii:

  1  csvToJson.asciiEncoding()
  2             .getJsonFromCsv(fileInputName);

• base64:

  1  csvToJson.base64Encoding()
  2             .getJsonFromCsv(fileInputName);

• hex:

  1  csvToJson.hexEncoding()
  2             .getJsonFromCsv(fileInputName);

Chaining Pattern

The exposed API is implemented with the Method Chaining Pattern, which means that multiple methods can be chained, e.g.:

1let csvToJson = require('convert-csv-to-json');
2
3csvToJson.fieldDelimiter(',')
4            .formatValueByType()
5            .parseSubArray("*",',')
6            .supportQuotedField(true)
7            .getJsonFromCsv('myInputFile.csv');
8

Development

• Download all csvToJson dependencies:

  npm install
  

• Run Tests

  npm test
  

• Debug Tests

  npm run test-debug
  

CI CD github action

This repository uses the GitHub Action iuccio/npm-semantic-publish-action@latest to publish the npm packeges. Pushing on the master branch, depending on the git message, an new version will always be released. If the commit message contains the keyword:

• [MAJOR]: new major relase, e.g. v1.0.0 -> v2.0.0
• [PATCH]: new patch relase, e.g. v1.0.0 -> v1.0.1
• without any of the above keywords a new minor relase will be applied, e.g. v1.0.0 -> v1.1.0

License

CSVtoJSON is licensed under the GNU General Public License v3.0 License.

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