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OAuth2 Resource Owner Password Flow with vanilla JavaScript
// Please avoid "password" flow at all cost, it has been officially deprecated
// But, if you must use it, here's a simple way to do so:
async function getTokenResponse(clientId, identityServerUrl, username, password) {
const response = await fetch(identityServerUrl + "/connect/token", {
method: "POST",
headers: {
'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
body: new URLSearchParams({
"grant_type": "password",
"client_id": clientId,
"username": username,
"password": password,
const json = await response.json();
console.log(json); // json.access_token should contain the actual token
return JSON.stringify(json, null, 2);
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