If you have learnt anything from this tutorial, please follow me on TWITTER, for notifications when I post new articles. One of the first decisions was to use Mongooseas an easier way to model objects stored in the database. I have the code to this article on github, you can fork it here, and you can follow me too. Having recently migrated a legacy project from MySQL to MongoDB, I’ve had to fight a fair bit getting models and schemas to work with existing controllers etc. My guess would be that you are extending IContact, which you are also simultaneously casting (from a mongoose Document) to a mongoose Model. As a Node developer, chances are that you've already encountered with both Mongoose, and ODM (Object Document Mapper)library helping you connect your app to a MongoDB and TypeScript which is a typed superset of JavaScript that enables the developer to write code with less potential bugs, increased maintainability and smarter code completion through types. Then register it in our express app like this: In route/todo.ts, hover on the req and res parameter, you will notice that req has an implicit type of Request and res has an implicit type of Response. include the following code in routes/todo.ts. A common problem however when using Mongoose with TypeScript is that you have to define both the Mongoose model and TypeScript interface which leads to redundancy. After that create a Mongoose connection to your MongoDB instance. Also, I Recommend VScode as a code editor because VSCode includes typescript language support. You don’t need to. How does the DB know what models there are? You can test this out by yourself on postman. Make typescript work with mongoose. Now, to make use of this interface, we would create some little trick for creating an instance of our model, instead of creating our model instances directly by writing. in our models/todo.ts file, include the following code: Notice that we are defining our interface a little differently here, this is because we just want to add the build function to our existing Todo model, to do that, we are extending the existing model interface, the extend keyword means, “take all properties of the existing mongoose.Model interface, add them to our new interface, TodoModelInterface”, then we include the build function as part of the properties in the TodoModelInterface, now the TodoModelInterface contains all the properties of our mongoos.Model interface and the build function. This type of programming pattern is called a singleton pattern. mkdir src/models. This interface will tell typescript that we will have a build function in the Todo model.

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