NestJS - Axios Oath2 get third party access token - oauth-2.0

Question

I am newby on NestJS I wrote following code to get access token from third party but API respond data: error: 'invalid_request', error_description: 'Missing Mandatory Parameters'} may be I am missing headers or something else.
Following code I am using:
async getEquifaxToken() {
const token_params = {
grant_type: 'client_credentials',
client_id: 0000,
client_secret: 0000,
scope: 'https://api.equifax.com/business/consumer-credit/v1',
};
try {
const response = await axios.post(
environment.equifax_api_url + 'v2/oauth/token',
querystring.stringify(token_params)
);
console.log('--response--', response.data);
} catch (error) {
console.error(error);
}
console.log('--before after--');
}
I got access token from POSTMAN authentication popup.

Answer 1

Mistake was client_id and client_secret not usedful in token_params so just add
btoa function is not available on nestJS you have to install btoa https://www.npmjs.com/package/btoa and then include client_id and client_secret in headers params.
const client_id = 0000;
const client_secret = 0000;
const token_headers = {
Authorization:
'Basic ' +
btoa(
client_id +
':' +
client_secret
),
};
async getEquifaxToken() {
const token_params = {
grant_type: 'client_credentials',
client_id: client_id,
client_secret: client_secret,
scope: 'https://api.equifax.com/business/consumer-credit/v1',
};
try {
const response = await axios.post(
environment.equifax_api_url + 'v2/oauth/token',
querystring.stringify(token_params),
{headers:token_headers}
);
console.log('--response--', response.data);
//Here I got token successfully.
} catch (error) {
console.error(error);
}
}