SharePoint Rest API how to get Access Token?

Question

Just starting to work with SharePoint and Microsoft authentication and trying to get a SharePoint List into a JavaScript App. From Microsoft documentation, I need to use the following:

GET https://{site_url}/_api/web/lists/GetByTitle('List Title')
Authorization: "Bearer " + accessToken
Accept: "application/json;odata=verbose"

Have searched everywhere to find an definitive answer to how to obtain this accessToken. All the documentation I can find from Microsoft seem to be out of date. Does anyone know the current method to obtain an accessToken?

Answer 1

You could refer to this article to get access token:

https://global-sharepoint.com/sharepoint-online/in-4-steps-access-sharepoint-online-data-using-postman-tool/

Post https://accounts.accesscontrol.windows.net/<Tenant ID>/tokens/OAuth/2

Body:

grant_type     client_credentials
client_id      <Client ID>
client_secret  <Client Secret>
resource       00000003-0000-0ff1-ce00-000000000000/<tenant>.sharepoint.com@<Tenant ID>

My test result: