exchange_token

exchange_token.ts

function _encode(obj: object) {
    let string = "";

    for (const [key, value] of Object.entries(obj)) {
        if (!value) continue;
        string += `&${encodeURIComponent(key)}=${encodeURIComponent(value)}`;
    }

    return string.substring(1);
}

const config = {
    'client_id': this.config.clientId,
    'client_secret': this.config.clientSecret,
    'grant_type': 'authorization_code',
    'code': String(code),
    'redirect_uri': this.config.callbackUrl,
    'scope': this.config.scopes.join(' ')
}
const params = _encode(config)
const response = await fetch(`https://discordapp.com/api/oauth2/token`,
{
    method: 'POST',
    headers: {'Content-Type': 'application/x-www-form-urlencoded'},
    body: params
});
const oauthData = await response.json()

oauthData:

{
  error: 'invalid_grant',
  error_description: 'Invalid "code" in request.'
}

params:

  params: 'client_id=--redacted--&client_secret=--redacted--&grant_type=authorization_code&code=DOHX20uX176gVEwj0dhK3WPb1kW3vu&redirect_uri=http%3A%2F%2Flocalhost%3A5173&scope=identify'