(Node.js) Refresh eBay Application Access Token

This example shows how to get a new eBay REST API access token when the original is close to expiration.

Note: This example requires Chilkat v9.5.0.80 or greater. (This example was written on 21-August-2019, before v9.5.0.80 was released. If Contact Chilkat for a pre-release if the current Chilkat version is not yet at 9.5.0.80 or greater.)

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    // The previously fetched eBay access token looks like this:

    // {
    //   "access_token": "v^1.1#i^1# ... HwSAAA=",
    //   "expires_in": 7200,
    //   "refresh_token": "v^1.1#i^1# ... FXjEyODQ=",
    //   "refresh_token_expires_in": 47304000,
    //   "token_type": "User Access Token"
    // }

    var json = new chilkat.JsonObject();
    var success = json.LoadFile("qa_data/tokens/ebay-access-token.json");
    if (success == false) {
        console.log("Failed to load the existing ebay access token JSON.");
        return;
    }

    var oauth2 = new chilkat.OAuth2();

    oauth2.TokenEndpoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token";

    // Replace these with actual values.
    oauth2.ClientId = "EBAY_CLIENT_ID";
    oauth2.ClientSecret = "EBAY_CLIENT_SECRET";

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

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

    // Load the access token response into the JSON object 
    json.Load(oauth2.AccessTokenResponse);

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    json.EmitCompact = false;
    json.WriteFile("qa_data/tokens/ebay-access-token.json");

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

}

chilkatExample();