Postman pre-request script (get token - JWT)

pre_requests.js

pm.sendRequest({
    url: pm.variables.get("auth_url"),
    method: 'POST',
    header: {
        'Content-Type': 'application/json',
    },
    body: {
        mode: 'raw',
        raw: JSON.stringify({
            'email': pm.variables.get("auth_email"),
            'password': pm.variables.get("auth_pass"),
        })
    }
}, function (err, response) {
    pm.variables.set("token", response.json().token);
});