js_framework_timelines.json

[
  {
    "groupName": "The Big Four",
    "timelines": [
      {
        "timelineName": "AngularJS",
        "events": {
          "versions": [
            ["2010-10-21", "v0.9"],
            ["2012-06-14", "v1.0"],
            ["2016-12-08", "v1.6"],
            ["2018-05-11", "v1.7"]
          ],
          "milestones": [
            ["2016-06-01", "Stack Overflow Trends Peak"],
            ["2018-06-30", "End of Active Development"],
            ["2021-06-30", "End of Support"]
          ]
        }
      },
      {
        "timelineName": "Angular",
        "events": {
          "versions": [
            ["2016-09-15", "v2.0"],
            ["2017-03-24", "v4.0"],
            ["2017-11-01", "v5.0"],
            ["2018-05-03", "v6.0"]
          ],
          "milestones": []
        }
      },
      {
        "timelineName": "React",
        "events": {
          "versions": [
            ["2013-07-02", "v0.03"],
            ["2015-10-09", "v0.14"],
            ["2016-04-08", "v15.0"],
            ["2017-09-26", "v16.0"]
          ],
          "milestones": []
        }
      },
      {
        "timelineName": "Vue",
        "events": {
          "versions": [
            ["2013-12-08", "v0.6"],
            ["2015-10-27", "v1.0"],
            ["2016-09-30", "v2.0"]
          ],
          "milestones": []
        }
      }
    ]
  },
  {
    "groupName": "The Historicaly Relevant",
    "timelines": [
      {
        "timelineName": "Backbone",
        "events": {
          "versions": [
            ["2010-10-03", "v0.1"],
            ["2013-03-20", "v1.0"],
            ["2016-04-05", "v1.3"]
          ],
          "milestones": []
        }
      },
      {
        "timelineName": "Knockout",
        "events": {
          "versions": [
            ["2010-07-05", "v1.0"],
            ["2011-12-21", "v2.0"],
            ["2013-10-25", "v3.0"]
          ],
          "milestones": [
            [
              "2018-05-26",
              "Don't get it wrong, Knockout.js is<br/>still maintained, the 3.5 just entered<br/>release candidate"
            ]
          ]
        }
      },
      {
        "timelineName": "Ember",
        "events": {
          "versions": [
            ["2011-12-12", "v0.9"],
            ["2013-09-01", "v1.0"],
            ["2015-08-13", "v2.0"],
            ["2018-02-14", "v3.0"]
          ],
          "milestones": []
        }
      }
    ]
  },
  {
    "groupName": "The JavaScript Ecosystem",
    "timelines": [
      {
        "timelineName": "NodeJS",
        "events": {
          "versions": [
            ["2009-05-27", "0.0.1"],
            ["2013-03-11", "0.10"],
            ["2015-02-06", "0.12"],
            ["2016-04-26", "v6"],
            ["2017-05-30", "v8"],
            ["2018-04-24", "v10"]
          ],
          "milestones": []
        }
      },
      {
        "timelineName": "JQuery",
        "events": {
          "versions": [
            ["2006-08-26", "v1.0"],
            ["2013-04-18", "v2.0"],
            ["2016-01-08", "v3.0"]
          ],
          "milestones": []
        }
      },
      {
        "timelineName": "Javascript",
        "events": {
          "versions": [
            ["1996-03-01", "v1.0"],
            ["1999-12-01", "ES3"],
            ["2009-12-01", "ES5"],
            ["2015-06-01", "ES6"],
            ["2016-06-01", "ES7"],
            ["2017-06-01", "ES8"],
            ["2018-06-01", "ES9"]
          ],
          "milestones": [
            ["2000-03-01", "Work began on ES4"],
            ["2003-06-01", "ES4 put on hold"],
            ["2005-09-01", "ES4 start again"],
            ["2008-08-01", "ES4 Abandoned"]
          ]
        }
      }
    ]
  }
]

timeline_csv_to_json.js

const fs = require('fs');

const [ , , csvFile] = process.argv;
let csvTimeline = fs.readFileSync(csvFile, 'utf8')
  .split('\n')
  .slice(2)
  .map(line => line.split(','))
  .map(([timeline, eventType, event, start, end, source]) => ({timeline, eventType, event, start, end, source}))
  .reduce((groupedTimelines, currentEvent) => {
    if(groupedTimelines[currentEvent.timeline]) {
      groupedTimelines[currentEvent.timeline].events.versions.push([currentEvent.start, currentEvent.event]);
    } else {
      groupedTimelines[currentEvent.timeline] = {
        "timelineName": currentEvent.timeline,
        "events": {
          "versions": [],
          "milestones": []
        }
      };
    }
    return groupedTimelines;
  }, {})
  ;

const formated = [];

Object.values(csvTimeline).forEach((timeline) => {
  formated.push({
    "groupName": timeline.timelineName,
    "timelines": [timeline]
  });
});

console.log(JSON.stringify(formated));