DEV Community


How to get Gmail API Token

yeisoncruz16 profile image Yeison Cruz ・2 min read

First of all, login using you google account.

To generate the token, follow the next steps:

  1. Generate credentials.json from gmail page (next step)
  2. Go to Gmail guide and generate the credentials file (just if you dont have one)
  3. Create a folder to run the code mkdir gmail-generate.
  4. create the quickstart file touch quickstart.php
  5. Execute composer require "google/apiclient"
  6. run php quickstart.php (file content is below)
  7. Now in the folder path you have a token.json file

require __DIR__ . '/vendor/autoload.php';

if (php_sapi_name() != 'cli') {
    throw new Exception('This application must be run on the command line.');

 * Returns an authorized API client.
 * @return Google_Client the authorized client object
function getClient()
    $client = new Google_Client();
    $client->setApplicationName('Gmail API PHP Quickstart');
    $client->setPrompt('select_account consent');

    // Load previously authorized token from a file, if it exists.
    // The file token.json stores the user's access and refresh tokens, and is
    // created automatically when the authorization flow completes for the first
    // time.
    $tokenPath = 'token.json';
    if (file_exists($tokenPath)) {
        $accessToken = json_decode(file_get_contents($tokenPath), true);

    // If there is no previous token or it's expired.
    if ($client->isAccessTokenExpired()) {
        // Refresh the token if possible, else fetch a new one.
        if ($client->getRefreshToken()) {
        } else {
            // Request authorization from the user.
            $authUrl = $client->createAuthUrl();
            printf("Open the following link in your browser:\n%s\n", $authUrl);
            print 'Enter verification code: ';
            $authCode = trim(fgets(STDIN));

            // Exchange authorization code for an access token.
            $accessToken = $client->fetchAccessTokenWithAuthCode($authCode);

            // Check to see if there was an error.
            if (array_key_exists('error', $accessToken)) {
                throw new Exception(join(', ', $accessToken));
        // Save the token to a file.
        if (!file_exists(dirname($tokenPath))) {
            mkdir(dirname($tokenPath), 0700, true);
        file_put_contents($tokenPath, json_encode($client->getAccessToken()));
    return $client;

// Get the API client and construct the service object.
$client = getClient();
$service = new Google_Service_Gmail($client);

// Print the labels in the user's account.
$user = 'me';
$results = $service->users_labels->listUsersLabels($user);

if (count($results->getLabels()) == 0) {
  print "No labels found.\n";
} else {
  print "Labels:\n";
  foreach ($results->getLabels() as $label) {
    printf("- %s\n", $label->getName());

Enter fullscreen mode Exit fullscreen mode

Discussion (0)

Forem Open with the Forem app