With my expertise in JavaScript, JSON, and MySQL, I am well-equipped to help you with your project. I have significant experience working with data and databases, particularly in MySQL, and can seamlessly convert your JSON file into a structured database format. I understand the complexities involved in handling varying product attributes like stock levels, specifications, and promotions, and I can assure you that these will be taken into account while designing the database schema.
In practical terms, this means that not only will I be able to successfully read and insert the product information into your MySQL database but I can also design it in a way that's scalable for any future needs. My proficiency in JavaScript allows me to not just write functional code but also write optimised code that performs well on your specified Ubuntu server environment.
Moreover, with my meticulous attention to detail and solid organizational skills, you can rest assured that all your data will be accurately transformed and saved as per required. Additionally, as a project management professional with a strong background in delivering complex projects successfully within stipulated timelines, I guarantee that your project will follow the same trajectory of success. Trust me with your project; together we'll ensure an efficient inventory system powered by clean data!