Pretty Print JSON in Ascii Tree

print.js

// TODO add colors

sample = {
  "language": {
     "backend": "node.js",
     "middleware": "node.js",
     "frontend": "es2018"
  },
  "cloud-storage": {
    "block": {
      "aws": "ebs",
      "gcp": "cbs",
      "azure": "abs"
    },
    "ssd": {
      "aws": "cost-prohibitive",
      "gcp": "gce-ssd",
      "azure": "cost-prohibitive"
    },
    "nvme": {
      "aws": "cost-prohibitive",
      "gcp": "nvme",
      "azure": "cost-prohibitive"
    }
  },
  "cloud-datastores": {
    "nosql": {
        "firebase": {},
        "dynamodb": {},
        "cosmos": {}
    }
  },
  "hosted-datastore": {
    "nosql": {
        "mongodb": {},
        "rethinkdb": {},
        "couchdb": {}
    },
    "inmemory": {
        "redis": {},
        "hazelcast": {},
        "VoltDB": {}
    },
    "static": {
       "replicated": {},
       "cdn-edge": {},
       "pwa-offline": {}
    }
  },
  "cloud-database": {
    "aws": {
      "mysql": "rds",
      "postgre": "rds",
      "mssql": "rds"
    },
    "gcp": {
      "mysql": "cloudsql",
      "postgre": "cloudsql",
      "mssql": "cloudsql"
    },
    "azure": {
      "mysql": "sqlservice",
      "postgre": "sqlservice",
      "mssql": "sqlservice"
    }
  },
  "hosted-database": {
    "mysql": {},
    "postgre": {},
    "mssql": {},
    "mariadb": {}
  },
  "middleware": {
    "logging": {
      "morgan": {},
      "graylog": {},
      "winston": {}
    },
    "tracing": {
      "zipkin": {},
      "signalfx": {},
      "jaeger": {}
    },
    "auth": {
      "google": "firebase",
      "auth0": "auth0",
      "aws": "amplify"
    }
  },
  "frameworks-ui": {
    "framework": ["vue","react","ember"],
    "components": [ "vuetify", "bootstrap", "polymer", "material", "semantic-ui"]
  },
  "frameworks-fullstack": {
    "redwood": "redwoodJs",
    "nuxt": "nuxtJs",
    "feathers": "feathersJs"
  },
  "integrations-marketing": {
    "email": ["maichimp", "klaviyo", "snowvio"],
    "voice-ivr": ["vonage","twilio"],
    "crm": ["salesforce","pipedrive","activecampaign"],
    "content-curation": ["intelligently.social", "contentstudio", "crowdfire"],
    "intelligence": ["spokeo", "crunchbase", "hunter.io"],
    "chatbot": ["kommunicate","intercom","crisp"],
    "customAI": ["dialogueFlow", "lex", "personalizer"]
  },
  "developer-tools": {
    "api-generators": ["ibm-api-connect","swagger",]
  }
}

const asciitree = require('ascii-tree');

function pretty_json(v) {
    console.log(JSON.stringify( v, 0, 2 ))
}

function ascii_json(json) {
    const list = ['#root'];
    _traverse(list, json, 1);
    const tree = asciitree.generate(list.join('\r\n'));
    console.log(tree)
}

function _traverse(list, node, level) {
    level++;
    const prefix = Array(level + 1).join('#');
    const type = typeof node;
    if (node === undefined || node === null) {
        // Array.isArray([])?
        list.push(prefix + node);
    }
    else if (type === 'object') {
        Object.keys(node).forEach(k => {
            list.push(prefix + k);
            _traverse(list, node[k], level);
        });
    }
    else {
        // string boolean
        list.push(prefix + node);
    }
}

pretty_json(sample)
ascii_json(sample)