Query Resolvers

Blitz queries are plain, asynchronous JavaScript functions that always run on the server.

1. Queries must be inside a queries folder. All of the following are valid:

• app/queries/getProject.ts
• app/projects/queries/getProject.ts
• app/admin/projects/queries/getProject.ts

2. Queries must export a function as the default export

You can write any normal Node.js code here, including database access and fetching from third-party APIs.

Arguments

• input: any
  • The first argument is anything you need for your query. There are no special requirements.
• ctx: Ctx
  • This context object is automatically provided by Blitz at run time. This is used by HTTP Middleware to provide data or functions to your query. For example, authentication middleware can provide ctx.session with all the data about the current user session.

Example Query

// app/products/queries/getProduct.tsx
import { Ctx } from "blitz"
import db from "db"
import * as z from "zod"

const GetProject = z.object({
  id: z.number(),
})

export default async function getProject(
  input: z.infer<typeof GetProject>,
  ctx: Ctx
) {
  // Validate the input
  const data = GetProject.parse(input)

  // Require user to be logged in
  ctx.session.$authorize()

  const project = await db.project.findOne({ where: { id: data.id } })

  // Can do any processing, fetching from other APIs, etc

  return project
}

We automatically alias the root of your project, so import db from 'db' is importing <project_root>/db/index.ts

Next, read these docs to see how to use these queries in your components.