How to validate user input in a NoSQL web application

Like many other modern JSON databases, RethinkDB is schemaless: the developer doesn’t have to define a fixed structure or specify field types when creating a new table. In cases where validation is desirable, it’s up to the developer to build it into their application. Shifting the responsibility for input validation from the persistence layer to the application layer gives developers a lot of flexibility in how they choose to implement the capability. This blog post demonstrates several ways to validate input in Node.js web applications.