source: node_modules/traverse/examples/stringify.js@ d24f17c

#!/usr/bin/env node

'use strict';

var traverse = require('traverse');

var obj = ['five', 6, -3, [7, 8, -2, 1], { f: 10, g: -13 }];

var s = '';
traverse(obj).forEach(function toS(node) {
        if (Array.isArray(node)) {
                this.before(function () { s += '['; });
                this.post(function (child) {
                        if (!child.isLast) { s += ','; }
                });
                this.after(function () { s += ']'; });
        } else if (typeof node === 'object') {
                this.before(function () { s += '{'; });
                this.pre(function (x, key) {
                        toS(key);
                        s += ':';
                });
                this.post(function (child) {
                        if (!child.isLast) { s += ','; }
                });
                this.after(function () { s += '}'; });
        } else if (typeof node === 'string') {
                s += '"' + node.toString().replace(/"/g, '\\"') + '"';
        } else if (typeof node === 'function') {
                s += 'null';
        } else {
                s += node.toString();
        }
});

console.log('JSON.stringify: ' + JSON.stringify(obj));
console.log('this stringify: ' + s);