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Validation is a middleware and Mongoose runs validation before saving the model into a database. 3.Built-in Validation Rules. Mongoose gives us a set of useful built-in validation rules such: Required validator checks if a property is not empty. ... We’ll change the sync custom validation to async. The .save() will resolve and save has finished will log before async thing has finished is logged.. The same pre-save middleware works as expected when passing a callback to .save() instead of using the returned promise.. mongoose: 4.1.3 node: 0.12.7 mongo: 2.6.6.
With MongoDB available to us, we can create a fresh Hapi.js project with all the appropriate dependencies. Create a new project directory and execute the following commands: npm init -y npm install hapi joi mongoose --save. The above commands will create a new package.json file and install the Hapi.js framework, the Joi validation framework.