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How to correct Discord API request giving error 1020

i'm trying to make a request to discord api from my personal website, but it's giving the "Access denied Error code 1020", when I try using postMan it works.
Here's my code:
window.onload = function() {
fetch('https://discord.com/api/v9/users/' + userId, {
method: 'get',
headers: new Headers({
'Authorization': 'Bot ' + botToken,
'Content-type': 'application/json'
})
}).then(response => response.json()).then(data => console.log(data))
};
and here's my response:
Access denied Error code 1020
You do not have access to discord.com.
The site owner may have set restrictions that prevent you from accessing the site.
Contact the site owner for access or try loading the page again.
Here's my Postman Request:
Here's the cookie request:

Postman request works but not axios CORS

In a bit of a pickle at the moment , I could do a postman request like that and I get my data response back :
URL : https://hiddenurlforexample.com
Authorization : Bearer XXXXXXXX-XXXX-XXXX-XXXX
When I do it on Axios on my website though I get a 401 CORS error. Any idea what the difference is ? This is how my axios request looks like :
axios
.request({
url: 'test/url',
method: 'get',
baseURL: 'https://hiddenurlforexample.com',
headers: {
"Access-Control-Allow-Origin" : "*",
"Content-type": "Application/json",
"Authorization": "Bearer XXXXXXXX-XXXX-XXXX-XXXX"
}
})
.then(response => {
console.log(response.data)
})
.catch(function (error) {
console.log(error)
})
I am a Frontend Developer, I have been told that there was nothing to do in the backend .

What Chris G said, and next to that Postman ignores the CORS validation because it is a dev tool.
Your backend server should return the correct CORS headers. While developing you could go with a wildcard for the CORS headers but it's highly recommended to add the specific domain you're calling the backend from (i.e. the domain of your website).
Also note that the CORS headers are returned via an OPTIONS call, again, your backend should support that. What backend are you running?

What's wrong with my authorization syntax? Getting 403 - ImgurAPI

I'm trying to get a response from the Imgur API but despite my best efforts I seem to be passing the Client ID improperly.
const key = `Client-ID ${process.env.REACT_APP_IMGURKEY}`;
fetch(url, {
method: "GET",
headers: new Headers({
Authorization: key
})
})
result of the fetch is 403: invalid Client ID, I've double checked and confirmed client ID is valid.

You need to retrieve an access token in order to be able to make requests to "Authed" requests in Imgur's api.
More details: https://apidocs.imgur.com/?version=latest#authorization-and-oauth
Basically you need to redirect the user of your app to this URL:
const YOUR_CLIENT_ID = process.env.REACT_APP_IMGURKEY;
const url = 'https://api.imgur.com/oauth2/authorize?client_id=' + YOUR_CLIENT_ID + ' &response_type=token'
Then the user will see an Imgur page, asking them to give permission to your app. After the user agreed to give permission, they are taken back to the URL you configured in your application preferences, and the access token will be in the URL:
https://example.org/#access_token=ACCESS_TOKEN&expires_in=315360000&token_type=bearer&refresh_token=___&account_username=___&account_id=____
Then you can make requests passing the access token like this:
fetch(url, {
method: "GET",
headers: new Headers({
Authorization: "Bearer " + ACCESS_TOKEN
})
})

Example of fetch() method to API with Azure AD B2C authorization

I'm looking for example of fetch() method to call secured API (I use Azure AD B2C)
To be specific I I don't know how should my headers look like.
Calling API using Postman with authorization works.
My API is hosted on localhost:44320 I didn't deploy it.
In React I use 'react-azure-adb2c' library and it also works. I can log in and after that I'm getting token with all claims which I need.
var token = auth.getToken(); //here is the token which is correct
fetch("https://localhost:44320/api/worker/", {
method: "GET",
headers: {
Authorization: token,
Accept: "application/json",
Host: "localhost:44320"
}
})
.then(res => res.json())
.then(json => this.setState({ listOfWorkers: json.results }));
}

You specify the header as Authorization: Bearer token-value-here.
So Authorization: 'Bearer ' + token in your case.

How to send authorization header with axios

How can I send an authentication header with a token via axios.js?
I have tried a few things without success, for example:
const header = `Authorization: Bearer ${token}`;
return axios.get(URLConstants.USER_URL, { headers: { header } });
Gives me this error:
XMLHttpRequest cannot load http://localhost:8000/accounts/user/. Request header field header is not allowed by Access-Control-Allow-Headers in preflight response.
I have managed to get it work by setting global default, but I'm guessing this is not the best idea for a single request:
axios.defaults.headers.common['Authorization'] = `Bearer ${token}`;
Update :
Cole's answer helped me find the problem. I am using django-cors-headers middleware which already handles authorization header by default.
But I was able to understand the error message and fixed an error in my axios request code, which should look like this
return axios.get(URLConstants.USER_URL, { headers: { Authorization: `Bearer ${data.token}` } });

On non-simple http requests your browser will send a "preflight" request (an OPTIONS method request) first in order to determine what the site in question considers safe information to send (see here for the cross-origin policy spec about this). One of the relevant headers that the host can set in a preflight response is Access-Control-Allow-Headers. If any of the headers you want to send were not listed in either the spec's list of whitelisted headers or the server's preflight response, then the browser will refuse to send your request.
In your case, you're trying to send an Authorization header, which is not considered one of the universally safe to send headers. The browser then sends a preflight request to ask the server whether it should send that header. The server is either sending an empty Access-Control-Allow-Headers header (which is considered to mean "don't allow any extra headers") or it's sending a header which doesn't include Authorization in its list of allowed headers. Because of this, the browser is not going to send your request and instead chooses to notify you by throwing an error.
Any Javascript workaround you find that lets you send this request anyways should be considered a bug as it is against the cross origin request policy your browser is trying to enforce for your own safety.
tl;dr - If you'd like to send Authorization headers, your server had better be configured to allow it. Set your server up so it responds to an OPTIONS request at that url with an Access-Control-Allow-Headers: Authorization header.

This has worked for me:
let webApiUrl = 'example.com/getStuff';
let tokenStr = 'xxyyzz';
axios.get(webApiUrl, { headers: {"Authorization" : `Bearer ${tokenStr}`} });

Rather than adding it to every request, you can just add it as a default config like so.
axios.defaults.headers.common['Authorization'] = `Bearer ${access_token}`

Try this :
axios.get(
url,
{headers: {
"name" : "value"
}
}
)
.then((response) => {
var response = response.data;
},
(error) => {
var status = error.response.status
}
);

You are nearly correct, just adjust your code this way
const headers = { Authorization: `Bearer ${token}` };
return axios.get(URLConstants.USER_URL, { headers });
notice where I place the backticks, I added ' ' after Bearer, you can omit if you'll be sure to handle at the server-side

Instead of calling axios.get function Use:
axios({ method: 'get', url: 'your URL', headers: { Authorization: `Bearer ${token}` } })

const response=await axios(url,
method:"GET"
{
headers: {
"Authorization" : `Bearer ${token}`
}
})

You can try this.
axios.get(
url,
{headers: {
"Access-Control-Allow-Origin" : "*",
"Content-type": "Application/json",
"Authorization": `Bearer ${your-token}`
}
}
)
.then((response) => {
var response = response.data;
},
(error) => {
var status = error.response.status
}
);

create a new axios instace for your request
const instance=axios.create({
baseURL:'www.google.com/'
headers:{
'Content-Type':'application/json',
'Acess-Control-Allow-Origin':'*',
'Authorization':`Bearer ${token}`,
'Accept': "application/json"
}
})
await instance.get(url,data)

Install the cors middleware. We were trying to solve it with our own code, but all attempts failed miserably.
This made it work:
cors = require('cors')
app.use(cors());
Original link

This is the Postman way of doing it:
headers: {
'Authorization': `Basic ${Buffer.from('username:password').toString('base64')}`
}

res.setHeader('Access-Control-Allow-Headers',
'Access-Control-Allow-Headers, Origin,OPTIONS,Accept,Authorization, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers');
Blockquote
: you have to add OPTIONS & Authorization to the setHeader()
this change has fixed my problem, just give a try!