grib2json

A simple wrapper around the grib2json command line tool. Allows you to call the grib2 converter directly from your nodejs code.

• Installation
• Usage
  • Setting the grib2json path
  • Filtering grib2 files
• License

Installation

npm i --save grib2json

You also need to have the grib2json command installed somewhere on your machine. See Installation for instructions on how to install grib2json.

Usage

var grib2json = require('grib2json')

grib2json('/path/to/grib2-file', {/* options */}, function (err, json) {
  if (err) return console.error(err)

  console.log(json)
})

This will output the entire grib2 file as json. The default mode is to just return the headers - the same behaviour as the original grib2json utility.

Setting the grib2json path

If grib2json is installed in your system path, there is nothing to do here. Otherwise, there are multiple options for providing the path to grib2json:

1. Using environment variables: we look for an environment variable called GRIB2JSON_PATH and use it as a path to the grib2json utility.
2. Using options: you can provide the path to grib2json via the options object:

   grib2json('/path/to/grib2-file',{
     scriptPath: '/home/me/grib2json/bin/grib2json'
   }, function (err, json) {
   
   })

Filtering grib2 files

You can filter the grib2 file with the same parameters the original grib2json utility accepts by using the options object:

var grib2json = require('grib2json')

// Print the v-component of wind at 10 meters above surface
// Includes header names and data
grib2json('/path/to/grib2-file', {
  names: true, // (default false): Return descriptive names too
  data: true, // (default false): Return data, not just headers
  category: 2, // Grib2 category number, equals to --fc 1
  parameter: 3, // Grib2 parameter number, equals to --fp 7
  surfaceType: 103, // Grib2 surface type, equals to --fs 103
  surfaceValue: 10, // Grib2 surface value, equals to --fv 10
}, function (err, json) {
  if (err) return console.error(err)

  console.log(json)
})

License

This package is licensed under the MIT license. See MIT for details.