Each individual instance value within a TypeScript interface is uniquely defined

As a newcomer to JavaScript and React, I am currently working on a TypeScript project that involves using React, Sequelize, and Postgres for the database.

In my post route with Fastify, I am struggling to access the quantity member of request.body. Although I can see the correct quantity when logging the entire body, the individual extraction of the quantity yields undefined.

interface IMyInterfaceCreateBody {
  quantity: number;
}

interface IMyInterfacePostReply {
  200: { items: MyObject[] };
  201: { items: MyObject[] };
  302: { url: string };
  '4xx': { error: string };
}

const myRoute: FastifyPluginAsync = (fastify): Promise<void> => {
  fastify.post<{
    Body: IMyInterfaceCreateBody;
    Reply: IMyInterfacePostReply;
  }>('/myRoute', async function (request, reply) {
    const newItems: MyObject[] = [];
    const body: IMyInterfaceCreateBody = request.body;
    console.log(body);
    const quantity: number = body.quantity;
    console.log(quantity);
    for (let i = 0; i < quantity; i++) {
      const newMyObject = await MyObject.create({
        id: uuid(),
      });
      console.log(newMyObject);
      newItems.push(newMyObject);
    }
    await reply.code(201).send({ items: newItems });
  });

  return Promise.resolve();
};

Upon looking at the console output:

[App] {"quantity":1}
[App] undefined

I suspect that the issue lies in how I am handling raw data with Fastify hooks.

Despite attempting different approaches such as directly extracting the quantity value or using an interface instance to handle the body, I still encounter the issue of getting an undefined value for quantity.

The goal is to successfully retrieve the passed quantity value using the post route.

Answer №1

I was able to resolve the issue by adjusting the headers in my request to specify 'Content-Type: application/json' on the side of the client.

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