Node.js

Refresh GMail OAuth2 Access Token

See more GMail REST API Examples

Demonstrates how to refresh an expired or soon-to-expire GMail OAuth2 access token. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  It is assumed we previously obtained an OAuth2 access token.
    //  This example loads the JSON access token file 
    //  saved by this example: Get GMail OAuth2 Access Token

    var jsonToken = new chilkat.JsonObject();
    success = jsonToken.LoadFile("qa_data/tokens/gmail.json");
    if (success !== true) {
        console.log("Failed to load googleSheets.json");
        return;
    }

    //  The access token JSON looks like this:

    //  	{ 
    //  	 "access_token": "abac.Ci-ZabcdF37-VUrmSzxbHxTsMbtlN-uPfabcdAQN_2ekzj0s5osCzRabcdTDMGaa2Q",
    //  	 "token_type": "Bearer",
    //  	 "expires_in": 3600,
    //  	 "refresh_token": "1/lEe5abcdNJ77eOSDBabcdkQGVmDalkwabcdR2Hatbo"
    //  	}
    //  

    var oauth2 = new chilkat.OAuth2();

    oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token";

    //  Replace these with actual values.
    oauth2.ClientId = "GOOGLE-CLIENT-ID";
    oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET";

    //  Get the "refresh_token"
    oauth2.RefreshToken = jsonToken.StringOf("refresh_token");

    //  Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken();
    if (success !== true) {
        console.log(oauth2.LastErrorText);
        return;
    }

    //  The response contains a new access token, but we must keep
    //  our existing refresh token for when we need to refresh again in the future.
    jsonToken.UpdateString("access_token",oauth2.AccessToken);

    //  Save the new JSON access token response to a file.
    var sbJson = new chilkat.StringBuilder();
    jsonToken.EmitCompact = false;
    jsonToken.EmitSb(sbJson);
    sbJson.WriteFile("qa_data/tokens/gmail.json","utf-8",false);

    console.log("OAuth2 authorization granted!");
    console.log("New Access Token = " + oauth2.AccessToken);

}

chilkatExample();