Magento 2 rest api Consumer is not authorized to access %resources< - rest

Question

I want to get the products from magento 2 that is in my localhost. but when i put /rest/V1/products? it gives me
<response>
<message>Consumer is not authorized to access %resources</message>
<parameters>
<resources>Magento_Catalog::products</resources>
</parameters>
</response>
i have made roles and also integration. i don't know how to access these resources. i have to get these products in my ionic app

Answer 1

That error is fairly self explanatory - you haven't authenticated.
Here's an example of how to authenticate with an admin user and fetch products using curl;
// Fetch the user auth token
$userData = array("username" => "USER", "password" => "PASS");
$ch = curl_init("http://DOMAINNAME.com/index.php/rest/V1/integration/admin/token");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($userData));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json", "Content-Lenght: " . strlen(json_encode($userData))));
$token = curl_exec($ch);
// Now use the token to get all products
$ch = curl_init("http://DOMAINNAME.com/index.php/rest/default/V1/products?searchCriteria");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json", "Authorization: Bearer " . json_decode($token)));
// Here are the results
$result = curl_exec($ch);
$result = json_decode($result, 1);
echo '<pre>';
print_r($result);
echo '</pre>';