AntStack Backend Developer interview questions

Build an API Using Node.js or Django for a user 1.where he can add some data and get all data as response, 2.If same data is sent verify with existing data in database and display a message of duplicate. 3.And list all the data added by a perticular user by using userId. Fourth Round: 4. Asked about difference between SQl and NoSQL 5.Http Methods 6.React Hooks 7.asked to write code flat and sort a sub array like[1,8,[[3,9],5],[4,7]] 8.and Frequency of each character in "FizzBuzz" word, 9. Is Node.js is Single or Multi Threaded language, Give example for which are the multi thread and single thread supporting language, 10.where we use multi thread language(Game Development], 11.difference between class and object, 12.constructor, 13.difference between var, let, const, 14.when you use SQL and NoSQL in Project. 15. ResFul API, how it works 16. Rest all ar based on resume and projects 17. How actually a website works.