Pretty Print JSON in Ascii Tree

print.js

// TODO add colors

sample = { a: { b: { c: 1, moo: [3,2,1] } }, z: 'zzzz' }

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)