Angular 5 : Allow trailing slash in routes

I added below to your app.module.ts

import {Location, PathLocationStrategy} from '@angular/common';


const _orig_prepareExternalUrl = PathLocationStrategy.prototype.prepareExternalUrl;

PathLocationStrategy.prototype.prepareExternalUrl = function(internal) {
  const url = _orig_prepareExternalUrl.call(this, internal);

  if (url === '') {
    return url;
  }

  console.log('For ' + internal + ' we generated ' + url);
  if (url.endsWith('.html')) {
      return url;
  }

  if (url.endsWith('/')) {
    return url;
  }


  return url + '/';

};

Location.stripTrailingSlash = function (url) {
    const /** @type {?} */ match = url.match(/#|\?|$/);
    const /** @type {?} */ pathEndIdx = match && match.index || url.length;
    const /** @type {?} */ droppedSlashIdx = pathEndIdx - (url[pathEndIdx - 1] === '/' ? 1 : 0);
    const first = url.slice(0, droppedSlashIdx);
    const last = url.slice(pathEndIdx);

    if (first.endsWith('.html')) {
        return first + last;
    }

    return first + '/' + last;

};

And it now works for me with a trailing slash when .html is not there

Even more improved code (based on code from Umesh).

Add on top of main.ts:

import { Location } from "@angular/common";
// Prevent stripping of trailing slash
Location.stripTrailingSlash = function stripTrailingSlashNew(url: string) {
  return url;
};

Below code worked for me:

export const contactUsRoutes: Routes = [
    {
        path: 'contact-us/.', component: ContactUsComponent
    }
];

. .

<a [routerLink]="['/contact-us/.']">Contact us</a>

And add below code in your main.ts:

import { Location } from '@angular/common';

const __stripTrailingSlash = (Location as any).stripTrailingSlash;
(Location as any).stripTrailingSlash = function _stripTrailingSlash(url: string): string {
  const queryString$ = url.match(/([^?]*)?(.*)/);
  if (queryString$[2].length > 0) {
    return /[^\/]\/$/.test(queryString$[1]) ? queryString$[1] + '.' + queryString$[2] : __stripTrailingSlash(url);
  }
  return /[^\/]\/$/.test(url) ? url + '.' : __stripTrailingSlash(url);
};

I have referred below link for this solution:

https://stackblitz.com/github/ssatz/Angular5-Preserve-Trailing-Slash