Hono on AWS with SST

Create and deploy a Hono API in AWS with SST.

We are going to build a serverless Hono API, add an S3 Bucket for file uploads, and deploy it to AWS using SST.

Before you get started, make sure to configure your AWS credentials.

1. Create a project

Let’s start by creating our app.

mkdir my-hono-app && cd my-hono-app
npm init -y

Init SST

Now let’s initialize SST in our app. Make sure to add the @ion part.

npx sst@ion init
npm install

Select the defaults and pick AWS. This’ll create a sst.config.ts file in your project root.

2. Add an API

Let’s add a Hono API using an AWS Lambda. Update your sst.config.ts.

async run() {
  const hono = new sst.aws.Function("Hono", {
    url: true,
    handler: "index.handler",
  });

  return {
    api: hono.url,
  };
}

We are enabling the function URL for this.

Start dev mode

Start your app in dev mode. This runs your functions Live.

npx sst dev

This will give you the URL of your API.

+  Complete
   api: https://gyrork2ll35rsuml2yr4lifuqu0tsjft.lambda-url.us-east-1.on.aws

3. Add an S3 Bucket

Let’s add a public S3 Bucket for file uploads. Update your sst.config.ts.

const bucket = new sst.aws.Bucket("MyBucket", {
  public: true
});

Link the bucket

Now, link the bucket to the API.

const hono = new sst.aws.Function("Hono", {
  url: true,
  link: [bucket],
  handler: "index.handler",
});

4. Upload a file

We want the / route of our API to generate a pre-signed URL to upload a file to our S3 Bucket. Create an index.ts file and add the following.

const app = new Hono()
  .get("/", async (c) => {
    const command = new PutObjectCommand({
      Key: crypto.randomUUID(),
      Bucket: Resource.MyBucket.name,
    });

    return c.text(await getSignedUrl(s3, command));
  });

export const handler = handle(app);

Install the npm packages.

npm install hono @aws-sdk/client-s3 @aws-sdk/s3-request-presigner

Then add the relevant imports.

import { Resource } from "sst";
import { getSignedUrl } from "@aws-sdk/s3-request-presigner";
import {
  S3Client,
  GetObjectCommand,
  PutObjectCommand,
  ListObjectsV2Command,
} from "@aws-sdk/client-s3";
import { Hono } from "hono";
import { handle } from "hono/aws-lambda";

const s3 = new S3Client({});

5. Download a file

We want the /latest route of our API to generate a pre-signed URL to download the last uploaded file in our S3 Bucket. Add this to your routes in index.ts.

const app = new Hono()
  // ...
  .get("/latest", async (c) => {
    const objects = await s3.send(
      new ListObjectsV2Command({
        Bucket: Resource.MyBucket.name,
      }),
    );

    const latestFile = objects.Contents!.sort(
      (a, b) =>
        (b.LastModified?.getTime() ?? 0) - (a.LastModified?.getTime() ?? 0),
    )[0];

    const command = new GetObjectCommand({
      Key: latestFile.Key,
      Bucket: Resource.MyBucket.name,
    });

    return c.redirect(await getSignedUrl(s3, command));
  });

Test your app

Let’s try uploading a file from your project root. Make sure to use your API URL.

curl --upload-file package.json "$(curl https://gyrork2ll35rsuml2yr4lifuqu0tsjft.lambda-url.us-east-1.on.aws)"

Now head over to https://gyrork2ll35rsuml2yr4lifuqu0tsjft.lambda-url.us-east-1.on.aws/latest in your browser and it’ll download the file you just uploaded.

6. Deploy your app

Now let’s deploy your app.

npx sst deploy --stage production

You can use any stage name here but it’s good to create a new stage for production.

Connect the console

As a next step, you can setup the SST Console to git push to deploy your app and monitor it for any issues.

SST Console Autodeploy

You can create a free account and connect it to your AWS account.