Log key and value of a property containing a string in an object searched recursively while ignoring circular references.

object-find.js

function search(needle, obj, ignore = null) {
	needle = needle.toLowerCase();
	const objs = new Set();

	_search(obj);

	function _search(obj, root = '') {
		if (!obj || typeof obj !== 'object' || objs.has(obj)) {
			return;
		}

		objs.add(obj);

		for (let [key, value] of Object.entries(obj)) {
			let path = `${root}/${key}`;

			if (ignore && path.indexOf(ignore) !== -1) {
				continue;
			}

			const isString = typeof value === 'string';
			const keyMatches = key.toLowerCase().indexOf(needle) !== -1;
			const valueMatches = isString && value.toLowerCase().indexOf(needle) !== -1;

			if (keyMatches || valueMatches) {
				console.log(`${path}:`, value);
			}

			if (value && typeof value === 'object') {
				_search(value, path);
			}
		}
	}
}

usage.js

const obj = {
	a: 1,
	b: {
		c: {
			d: 'hello world'
		}
	},
	e: 2,
	f: {
		hello: 'world'
		arr: ['hello', 'world']
	},
	g: {
		h: {
			i: 'ignored hello'
		}
	}
};

// log all `hello` occurences in `obj`, ignoring `/g/h` path
search('hello', obj, '/g/h');

// logs:
// > /b/c/d: hello world
// > /f/hello: world
// > /f/arr/0: hello