Middlewares

A middleware it will intercept a request in order for you to execute custom logic before the route handler. Often, a middleware is used for things like authentication or logging. A middleware is a _middleware.ts|js file.

// routes/_middleware.ts

export async function handler(ctx: Context): Promise<Response> {
  // do something
  return await ctx.next();
}

Multiple middlewares

In case you need multiple middlewares, you can export the handler as an array. In this example, middleware1 will be called first, then midleware2.

// routes/_middleware.ts

export const handler = [
  async function middleware1(ctx: Context): Promise<Response> {
    // do something
    return await ctx.next();
  },
  async function middleware2(ctx: Context): Promise<Response> {
    // do something
    return await ctx.next();
  },
];