[json] Passing headers with axios POST request

I have written an axios POST request as recommended from the npm package documentation like:

var data = {
    'key1': 'val1',
    'key2': 'val2'
}
axios.post(Helper.getUserAPI(), data)       
.then((response) => {
    dispatch({type: FOUND_USER, data: response.data[0]})
})
.catch((error) => {
    dispatch({type: ERROR_FINDING_USER})
})

And it works, but now I have modified my backend API to accept headers.

Content-Type: 'application/json'

Authorization: 'JWT fefege...'

Now, this request works fine on Postman, but when writing an axios call, I follow this link and can't quite get it to work.

I am constantly getting 400 BAD Request error.

Here is my modified request:

axios.post(Helper.getUserAPI(), {
    headers: {
        'Content-Type': 'application/json',
        'Authorization': 'JWT fefege...'
    },
    data
})      
.then((response) => {
    dispatch({type: FOUND_USER, data: response.data[0]})
})
.catch((error) => {
    dispatch({type: ERROR_FINDING_USER})
})

Any help is greatly appreciated.

axios.post can recieve accept 3 arguments that last argument can accept a config object that you can set header

Sample code with your question:

var data = {
'key1': 'val1',
'key2': 'val2'
}
axios.post(Helper.getUserAPI(), data, {
        headers: {Authorization: token && `Bearer ${ token }`}
})       
.then((response) => {
    dispatch({type: FOUND_USER, data: response.data[0]})
})
.catch((error) => {
    dispatch({type: ERROR_FINDING_USER})
})

Interceptors

I had the same issue and the reason was that I hadn't returned the response in the interceptor. Javascript thought, rightfully so, that I wanted to return undefined for the promise:

// Add a request interceptor
axios.interceptors.request.use(function (config) {
    // Do something before request is sent
    return config;
  }, function (error) {
    // Do something with request error
    return Promise.reject(error);
  });

We can pass headers as arguments,

  onClickHandler = () => {
    const data = new FormData() 
    for(var x = 0; x<this.state.selectedFile.length; x++) {
      data.append('file', this.state.selectedFile[x])
    }

    const options = {
      headers: {
          'Content-Type': 'application/json',
      }
    };
    
    axios.post("http://localhost:8000/upload", data, options, {
      onUploadProgress: ProgressEvent => {
        this.setState({
          loaded: (ProgressEvent.loaded / ProgressEvent.total*100),
        })
      },
    })
      .then(res => { // then print response status
        console.log('upload success')
      })
      .catch(err => { // then print response status
        console.log('upload fail with error: ',err)
      })
    }

This might be helpful,

const data = {_x000D_
  email: "[email protected]",_x000D_
  username: "me"_x000D_
};_x000D_
_x000D_
const options = {_x000D_
  headers: {_x000D_
      'Content-Type': 'application/json',_x000D_
  }_x000D_
};_x000D_
_x000D_
axios.post('http://path', data, options)_x000D_
 .then((res) => {_x000D_
   console.log("RESPONSE ==== : ", res);_x000D_
 })_x000D_
 .catch((err) => {_x000D_
   console.log("ERROR: ====", err);_x000D_
 })

Blockquote

Blockquote

Here is a full example of an axios.post request with custom headers

var postData = {_x000D_
  email: "[email protected]",_x000D_
  password: "password"_x000D_
};_x000D_
_x000D_
let axiosConfig = {_x000D_
  headers: {_x000D_
      'Content-Type': 'application/json;charset=UTF-8',_x000D_
      "Access-Control-Allow-Origin": "*",_x000D_
  }_x000D_
};_x000D_
_x000D_
axios.post('http://<host>:<port>/<path>', postData, axiosConfig)_x000D_
.then((res) => {_x000D_
  console.log("RESPONSE RECEIVED: ", res);_x000D_
})_x000D_
.catch((err) => {_x000D_
  console.log("AXIOS ERROR: ", err);_x000D_
})

You can also use interceptors to pass the headers

It can save you a lot of code

axios.interceptors.request.use(config => {
  if (config.method === 'POST' || config.method === 'PATCH' || config.method === 'PUT')
    config.headers['Content-Type'] = 'application/json;charset=utf-8';

  const accessToken = AuthService.getAccessToken();
  if (accessToken) config.headers.Authorization = 'Bearer ' + accessToken;

  return config;
});

To set headers in an Axios POST request, pass the third object to the axios.post() call.

const token = '..your token..'

axios.post(url, {
  //...data
}, {
  headers: {
    'Authorization': `Basic ${token}` 
  }
})

To set headers in an Axios GET request, pass a second object to the axios.get() call.

const token = '..your token..' 

axios.get(url, {
  headers: {
    'Authorization': `Basic ${token}`
  }
})

Cheers!! Read Simple Write Simple

Or, if you are using some property from vuejs prototype that can't be read on creation you can also define headers and write i.e.

storePropertyMaxSpeed(){
                axios.post('api/property', {
                    "property_name" : 'max_speed',
                    "property_amount" : this.newPropertyMaxSpeed
                    },
                    {headers :  {'Content-Type': 'application/json',
                                'Authorization': 'Bearer ' + this.$gate.token()}})
                  .then(() => { //this below peace of code isn't important 
                    Event.$emit('dbPropertyChanged');

                    $('#addPropertyMaxSpeedModal').modal('hide');

                    Swal.fire({
                        position: 'center',
                        type: 'success',
                        title: 'Nova brzina unešena u bazu',
                        showConfirmButton: false,
                        timer: 1500
                        })
                })
                .catch(() => {
                     Swal.fire("Neuspješno!", "Nešto je pošlo do davola", "warning");
                })
            }
        },

Shubham answer didn't work for me.

When you are using axios library and to pass custom headers, you need to construct headers as an object with key name "headers". The headers key should contain an object, here it is Content-Type and Authorization.

Below example is working fine.

    var headers = {
        'Content-Type': 'application/json',
        'Authorization': 'JWT fefege...' 
    }
    axios.post(Helper.getUserAPI(), data, {"headers" : headers})

        .then((response) => {
            dispatch({type: FOUND_USER, data: response.data[0]})
        })
        .catch((error) => {
            dispatch({type: ERROR_FINDING_USER})
        })