Code snippet from MB Vaccine App

Barcode handling.js

        }, u.default.createElement(s.Camera, {
            onBarCodeScanned: R ? function(t) {
                var l, o, u, c, s, p, y;
                return n.default.async(function(v) {
                    for (;;) switch (v.prev = v.next) {
                        case 0:
                            return l = t.type, o = t.data, v.next = 3, n.default.awrap(f.getNetworkStateAsync());
                        case 3:
                            if (!1 !== (u = v.sent).isConnected && !1 !== u.isInternetReachable) {
                                v.next = 8;
                                break
                            }
                            O.navigate('Result', {
                                result: void 0
                            }), v.next = 25;
                            break;
                        case 8:
                            if (c = (0, w.sanitize)(o), s = (0, w.parseCertificateId)(c), p = (0, w.parseBaseURL)(c), !(0, w.validate)(l.toString(), s, p)) {
                                v.next = 24;
                                break
                            }
                            return v.prev = 12, v.next = 15, n.default.awrap(b.UserService.verify(s));
                        case 15:
                            y = v.sent, O.navigate('Result', {
                                result: y.data
                            }), v.next = 22;
                            break;
                        case 19:
                            v.prev = 19, v.t0 = v.catch(12), O.navigate('Result', {
                                result: void 0
                            });
                        case 22:
                            v.next = 25;
                            break;
                        case 24:
                            O.navigate('Result', {
                                result: {
                                    isValid: !1
                                }
                            });
                        case 25:
                            N();
                        case 26:
                        case "end":
                            return v.stop()
                    }
                }, null, null, [
                    [12, 19]
                ], Promise)

ParsingURL.js

    e.formatName = function(n, t) {
        return n.length > 30 && t.length <= 30 ? n.slice(0, 30) + "\u2026\n" + t : n.length <= 30 && t.length > 30 ? n + "\n" + t.slice(0, 30) + "\u2026" : n.length > 30 && t.length > 30 ? n.slice(0, 30) + "\u2026\n" + t.slice(0, 30) + "\u2026" : n.length + t.length > 30 || t.length - n.length >= 7 || n.length - t.length >= 7 ? n + "\n" + t : n + " " + t
    };
    e.parseCertificateId = function(n) {
        var t = n.indexOf('ID=');
        return n.substring(t + 3)
    };
    e.parseBaseURL = function(n) {
        var t = n.indexOf('ID=');
        return n.substring(0, t - 1)
    };
    e.ucFirst = function(n) {
        return n.charAt(0).toUpperCase() + n.slice(1)
    }

Request to validate UUID.js

    }, l.verify = function(n) {
        return t.default.async(function(t) {
            for (;;) switch (t.prev = t.next) {
                case 0:
                    return t.abrupt("return", c.default.get("/verification/" + n));
                case 1:
                case "end":
                    return t.stop()
            }
        }, null, null, null, Promise)

Validate QR code.js

    e.sanitize = function(t) {
        for (var w = t; w.includes('<') || w.includes('>');) w = w.replace('<', '').replace('>', '');
        return w
    };
    e.validate = function(t, w, s) {
        return ('256' === t || 'org.iso.QRCode' === t) && /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i.test(w) && /(https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|www\.[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9]+\.[^\s]{2,}|www\.[a-zA-Z0-9]+\.[^\s]{2,})/i.test(s)
    }

wow, was totally looking for context&hints about this as i got ready to do this myself, thanks for the share!