Show Top-level field names in console on a Postman API response

top-level-field-names-postman.js

// Parse the JSON response body
const responseBody = pm.response.json();

// Check if the response is an array and has elements
if (Array.isArray(responseBody) && responseBody.length > 0) {
    // Get the keys (top-level field names) from the first object in the array
    const topLevelFields = Object.keys(responseBody[0]);

    // Log the top-level field names as a comma-separated string to the Postman console
    console.log("Top-level field names in the JSON response: " + topLevelFields.join(', '));

    // Optional: Assert that the response contains expected fields
    pm.test("Response contains expected fields", function () {
        pm.expect(topLevelFields).to.include.members(['name', 'identifier']);
    });
} else {
    console.log("The response is not a valid array or is empty.");
}