app.js

console.log(process.argv[0], process.argv[1], process.argv[2], process.argv[3]);

if (process.argv.length < 4){
	console.log('Please type in station ID and Observation ID');
	process.exit();
}

const fs = require('fs')
const request = require('superagent')

var stationID = process.argv[2];
var observationID = process.argv[3];

var apiBase = 'https://network.satnogs.org/api/observations/'
var url = apiBase + observationID + '/?format=json&page=1&ground_station=' + stationID

fs. mkdirSync('station' + stationID +'_observation' + observationID);
console.log('station' + stationID +'_observation' + observationID + ' new folder created');

  request.get(url)  // fetches the JSON
  .then(response => {
    // we get the waterfall out of the JSON
    var waterfall = response.body.waterfall
    var audio = response.body.payload
    if (waterfall && waterfall.trim() !== '') {
      // if exists, we try to fetch the waterfall...which is png
      request.get(waterfall)
        .then(res2 => {
          fs.writeFile('./'+ 'station' + stationID + '_observation' + observationID + '/observation_' + observationID + '.png', res2.body, (err) => {
            if (err) throw err;
            console.log("observation_" + observationID + '.png has been saved to the new folder.');
          });
        })
    }
    if (audio && audio.trim() !== '') {
      // if exists, we try to fetch the waterfall - a png file
      // parse the audio url here and find final portion of the url filename
      request.get(audio)
        .then(res2 => {
          fs.writeFile('./'+ 'station' + stationID + '_observation' + observationID + '/observation_' + observationID + '.ogg', res2.body, (err) => {
            if (err) throw err;
            console.log("observation_" + observationID + '.ogg has been saved to the new folder.');
          });
        })
    }

  })

package.json

{
  "name": "app",
  "version": "1.0.0",
  "description": "",
  "main": "example.js",
  "scripts": {},
  "author": "Karina Micheli",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.18.3",
    "cors": "^2.8.4",
    "prompt": "^1.0.0",
    "request": "^2.88.0",
    "superagent": "^4.0.0-beta.5"
  }
}

This is a command line application that can pull the data from the satnogs api and print it on screen (or in the case of audio/image download it to your harddisk).

This app takes two user inputs:
station id
observation id (for exact observation)

If the observation has audio and/or image data, it will create a new folder in the application folder, and download + store the file inside the new folder.

To begin, open terminal and navigate to the folder which keeps the app.
To run the app, type: node app.js stationID observationID
Keep in mind, stationID and observationID should be replaced with the specific station and observation you are looking for.
The application will create a new folder within the app folder, naming it after the stationID and observationID, and save any .png or .ogg files inside of it.

I would like to credit August Black for assistance with this project.