how to make a nav bar in react js code example

Example 1: reactboostrap navbar responsive

import React from 'react'
import {
    BrowserRouter as Router,
    Switch,
    Route,
    useParams,
  } from "react-router-dom";
  import { Navbar,Nav,NavDropdown,Form,FormControl,Button } from 'react-bootstrap'
  import Home from './Home';
  import AboutUs from './AboutUs';
  import ContactUs from './ContactUs';

class BootstrapNavbar extends React.Component{

    render(){
        return(
            <div>
                <div className="row">
                    <div className="col-md-12">
                        <Router>
                            <Navbar bg="dark" variant="dark" expand="lg" sticky="top">
                                <Navbar.Brand href="#home">React Bootstrap Navbar</Navbar.Brand>
                                <Navbar.Toggle aria-controls="basic-navbar-nav" />
                                <Navbar.Collapse id="basic-navbar-nav">
                                    <Nav className="mr-auto">
                                    <Nav.Link href="/">Home</Nav.Link>
                                    <Nav.Link href="/about-us">Contact Us</Nav.Link>
                                    <Nav.Link href="/contact-us">About Us</Nav.Link>
                                    <NavDropdown title="Dropdown" id="basic-nav-dropdown">
                                        <NavDropdown.Item href="#action/3.1">Action</NavDropdown.Item>
                                        <NavDropdown.Item href="#action/3.2">Another action</NavDropdown.Item>
                                        <NavDropdown.Item href="#action/3.3">Something</NavDropdown.Item>
                                        <NavDropdown.Divider />
                                        <NavDropdown.Item href="#action/3.4">Separated link</NavDropdown.Item>
                                    </NavDropdown>
                                    </Nav>
                                    <Form inline>
                                    <FormControl type="text" placeholder="Search" className="mr-sm-2" />
                                    <Button variant="outline-success">Search</Button>
                                    </Form>
                                </Navbar.Collapse>
                            </Navbar>
                            <br />
                            <Switch>
                                <Route exact path="/">
                                    <Home />
                                </Route>
                                <Route path="/about-us">
                                    <AboutUs />
                                </Route>
                                <Route path="/contact-us">
                                    <ContactUs />
                                </Route>
                            </Switch>
                        </Router>
                    </div>
                </div>
            </div>
        )  
    }
}

export default BootstrapNavbar;

Example 2: navbar in left side in react

import React from 'react';
import { MDBIcon, MDBSideNavCat, MDBSideNavNav, MDBSideNav, MDBSideNavLink, MDBContainer, MDBRow, MDBBtn } from 'mdbreact';
import { BrowserRouter as Router } from 'react-router-dom';

class SideNavPage extends React.Component {
  state = {
    isOpen: false
  }

  handleToggle = () => {
    this.setState({
      isOpen: !this.state.isOpen
    });
  };

  render() {
    const { isOpen } = this.state;
    return (
      <Router>
        <MDBContainer>
          <MDBRow>
            <MDBBtn onClick={this.handleToggle}><MDBIcon icon="bars" size="5x" /></MDBBtn>
          </MDBRow>
          <MDBSideNav
            logo="https://mdbootstrap.com/img/logo/mdb-transparent.png"
            hidden
            triggerOpening={isOpen}
            breakWidth={1300}
            className="deep-purple darken-4"
          >
            <li>
              <ul className="social">
                <li>
                  <a href="#!">
                    <MDBIcon fab icon="facebook-f" />
                  </a>
                </li>
                <li>
                  <a href="#!">
                    <MDBIcon fab icon="pinterest" />
                  </a>
                </li>
                <li>
                  <a href="#!">
                    <MDBIcon fab icon="google-plus-g" />
                  </a>
                </li>
                <li>
                  <a href="#!">
                    <MDBIcon fab icon="twitter" />
                  </a>
                </li>
              </ul>
            </li>
            <MDBSideNavNav>
              <MDBSideNavCat
                name="Submit blog"
                id="submit-blog"
                icon="chevron-right"
              >
                <MDBSideNavLink>Submit listing</MDBSideNavLink>
                <MDBSideNavLink>Registration form</MDBSideNavLink>
              </MDBSideNavCat>
              <MDBSideNavCat
                name="Instruction"
                id="instruction"
                iconRegular
                icon="hand-pointer"
                href="#"
              >
                <MDBSideNavLink>For bloggers</MDBSideNavLink>
                <MDBSideNavLink>For authors</MDBSideNavLink>
              </MDBSideNavCat>
              <MDBSideNavCat name="About" id="about" icon="eye">
                <MDBSideNavLink>Instruction</MDBSideNavLink>
                <MDBSideNavLink>Monthly meetings</MDBSideNavLink>
              </MDBSideNavCat>
              <MDBSideNavCat name="Contact me" id="contact-me" iconRegular icon="envelope">
                <MDBSideNavLink>FAQ</MDBSideNavLink>
                <MDBSideNavLink>Write a message</MDBSideNavLink>
              </MDBSideNavCat>
            </MDBSideNavNav>
          </MDBSideNav>
        </MDBContainer>
      </Router>
    );
  }
}

export default SideNavPage;