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A gem useful for converting CSV files to JSON from command-line

branch: master
README.md

csv2json

Clients were sending me XLS files but my webs consume JSONs. So I needed to convert them to JSON easily from command-line...

Solution

  • export XLS as a CSV file (I use OpenOffice.org for this)
  • run csv2json file.csv > file.json (or json2csv file.json > file.csv)
  • there is no step 3

Sample

note: make sure your XLS table has the first row with column names, or use the -H option to provide some

This CSV file:

thumbpath,imgpath,imgsrc,width,height,thumbsrc,thumbwidth,thumbheight
thumbnails/,images/,paris_01.jpg,350,262,paris_01.jpg,75,56
thumbnails/,images/,paris_02.jpg,262,350,paris_02.jpg,75,56

gets turned into this JSON:

[
  {
    "thumbwidth": 75,
    "imgsrc": "paris_01.jpg",
    "thumbsrc": "paris_01.jpg",
    "height": 262,
    "imgpath": "images/",
    "thumbheight": 56,
    "thumbpath": "thumbnails/",
    "width": 350
  },
  {
    "thumbwidth": 75,
    "imgsrc": "paris_02.jpg",
    "thumbsrc": "paris_02.jpg",
    "height": 350,
    "imgpath": "images/",
    "thumbheight": 56,
    "thumbpath": "thumbnails/",
    "width": 262
  }
]

Installation

sudo gem install csv2json

Usage

Usage: csv2json [INPUT] [OPTIONS]

Specific options:
    -s, --separator SEP              Set separator character surrounded by single quotes (default is ',')
    -o, --output FILE                Write output to a file
    -p, --pretty                     Pretty-format JSON output
    -k, --skip-headers-from-file     Ignore the headers (first line) in the file; use with --headers to set your own
    -H, --headers HEADERS            Supply list of headers, where no headers exist in the file, or where you're using -k to ignore them
    -h, --help                       Show this message
    -v, --version                    Show version

We also provide json2csv, which converts in the opposite direction.

Usage: json2csv [INPUT] [OPTIONS]

Specific options:
    -s, --separator SEP              Set separator character surrounded by single quotes (default is ',')
    -o, --output FILE                Write output to a file
    -H, --headers HEADERS            Supply sorted list of headers, by which to order the columns in the CSV. These must match the key names in the JSON.
    -h, --help                       Show this message
    -v, --version                    Show version

Note: JSON field order is explicitly unsorted, so if you want predictable field order for CSV output, use the -H option.

Alternative usage

common usage is csv2json file.csv > file.json

csv2json should behave like proper unix command-line utility working with pipes, redirects, etc.

cat file.csv | csv2json | gzip > file.json.gz

Usage as a library

with files

require 'csv2json'

File.open('input.csv', 'r') do |input|
    File.open('output.json', 'w') do |output|
        CSV2JSON.parse(input, output)
    end
end

or in-memory

require 'csv2json'

input = StringIO.new(csv_string)
output = StringIO.new()
CSV2JSON.parse(input, output)

output.pos = 0
puts output.read

Authors

https://github.com/darwin/csv2json/graphs/contributors

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