How to pass Header JWT Token with Axios & React?

Question

I make web application with React, Express, MongoDB.

And, I want to pass jwt token with header.

But, I pass it, get 401 error (Unauthorized).

In login actions.js :

export function login(username, password) {
return function(dispatch) {
  axios
  .post(`${API_URL}/auth/login`, { username, password })
  .then(res => {
    dispatch(loginSuccess(res.data, username));
    const token = res.data.token;
    axios.defaults.headers.common["Authorization"] = token;
    history.push("/");
  })
  .catch(err => {
    if (err.response.status === 401) {
      dispatch(loginFailure(err));
    }
  });
 };
}

And, In my post.js in server :

getToken = function(headers) {
  if (headers && headers.authorization) {
    var parted = headers.authorization.split(" ");
      if (parted.length === 2) {
       return parted[1];
      } else {
       return null;
      }
    } else {
     return null;
    }
 };
...
// Save Post
router.post("/", passport.authenticate("jwt", { session: false }), 
 function(
  req,
  res,
  next
  ) {
 var token = getToken(req.headers);
 if (token) {
   Post.create(req.body, function(err, post) {
     if (err) return next(err);
      res.json(post);
     });
   } else {
    return res.status(403).send({ success: false, msg: "Unauthorized." });
   }
});

How I do fix it? + Login is success

Answer 1

First of all when you login and send username and password to backend then in response you get token_id. now try to token store in session_storage and redirect to your desire page. now you take token_id in your desire page and store one variable as like..

let user = JSON.parse(sessionStorage.getItem('data'));
const token = user.data.id;

now you have token and pass in the header and get data in response

const api = `your api here`
axios.get(api, { headers: {"Authorization" : `Bearer ${token}`} })
        .then(res => {
            console.log(res.data);
        this.setState({
            items: res.data,  /*set response data in items array*/
            isLoaded : true,
            redirectToReferrer: false
        })

note : you should set blank items array in initial setState as like

this.state={
            items:[],
            isLoaded: false,
            redirectToReferrer:false,
            token:''
        }

Answer 2

Include your token as authorization key as below.

axios.post(url,data, {
    headers: {
        'authorization': your_token,
        'Accept' : 'application/json',
        'Content-Type': 'application/json'
    }
})
.then(response => {
    // return  response;
})
.catch((error) => {
    //return  error;
});