(Node.js) MercadoLibre Refresh OAuth2 Access Token

Demonstrates how to refresh a MercadoLibre OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

For more information, see https://developers.mercadolibre.com.ar/es_ar/autenticacion-y-autorizacion#Refresh-token

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 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 MercadoLibre OAuth2 Access Token

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

    // The access token JSON looks like this:

    // {
    //   "access_token": "APP_USR-8133606632685744-060115-93e1fd8b5e767c51c238df347bd0b288-577628017",
    //   "token_type": "bearer",
    //   "expires_in": 21600,
    //   "scope": "offline_access read write",
    //   "user_id": 577625107,
    //   "refresh_token": "TG-5ad522a286f1200006ac4ed1-577625007"
    // }

    var oauth2 = new chilkat.OAuth2();

    oauth2.TokenEndpoint = "https://api.mercadolibre.com/oauth/token";

    // Replace these with actual values.
    oauth2.ClientId = "MY_MERCADOLIBRE_APP_ID";
    oauth2.ClientSecret = "MY_MERCADOLIBRE_APP_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;
    }

    console.log("New access token: " + oauth2.AccessToken);
    console.log("New refresh token: " + oauth2.RefreshToken);

    // Update the JSON with the new tokens.
    jsonToken.UpdateString("access_token",oauth2.AccessToken);
    jsonToken.UpdateString("refresh_token",oauth2.RefreshToken);

    // 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/mercadolibre.json","utf-8",false);

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

}

chilkatExample();