Javascript

Build your Backend with Netlify Functions in 20 Minutes

Published Dec 7, 2020

Updated Feb 14, 2023

9 min read

This article was written over 18 months ago and may contain information that is out of date. Some content may be relevant but please refer to the relevant official documentation or available resources for the latest information.

Build your Backend with Netlify Functions in 20 minutes

Netlify makes deploying your front end quick and easy, and Netlify functions makes running a serverless backend just as easy.

In this guide, we'll get setup on how to use Netlify functions. As an indie developer, you should embrace serverless offerings because of their low barrier to entry and generous free tiers. And as an enterprise shop, you should seriously consider them for an extremely cheap, fast, and scalable way to build out your backend infrastructure.

Use Cases - What can you build?

Modern JavaScript frameworks allow us to build large and complex applications on the client, but they can occasionally run into limitations. For everything else, there's the "backend" which excels at handling some of these use cases:

Protecting Secrets & Credentials
Server Side Rendering
Sending Emails
Handling File IO
Running centralized logic
Executing tasks off the main thread
Bypassing CORS issues for locked down APIs
Providing Progressive Enhancement / NoScript Fallback

Composition of a Function

Netlify Functions provides a wrapper around AWS Lambdas. While the Netlify documentation should be sufficient, it's good to know that there's an escape hatch if you ever want to run on your own AWS subscription. However, Netlify handles some of the deployment magic for you, so let's start there.

Here's the bare bones of a Netlify function in JavaScript:

exports.handler = async function(event, context) {
    return {
        statusCode: 200,
        body: JSON.stringify({message: "Hello World"})
    };
}

If you're familiar with running JavaScript on Node, this should look somewhat familiar. Each function should live in its own file, and will execute whatever is assigned to exports.handler. We have access to event and context. We can run whatever code we need on Node, and return whatever response type we'd like.

To set this up, lets create an empty repository on GitHub. We need to add functions to a folder. While we can use any name, a common pattern is to create a folder name functions. Let's add a file in there called hello.js

//functions/hello.js
exports.handler = async (event, context) => {
  const { name = "Anonymous" } = event.queryStringParameters;
  return {
    statusCode: 200,
    body: `Hello, ${name}`
  };
};

In our function, we can grab information from the query string parameters passed in. We'll destructure those (with a default value) and look for a name param.

To actually wire up our functions folder, we'll need to add a netlify.toml config file at the root of our project.

# netlify.toml
[build]
  functions = "functions/"

Walk Before You Run (Locally)

Our "repo" should look like this at this point:

my-app
├── functions
│   └── hello.js
└── netlify.toml

The best way to run your Netlify site locally, with all the bells and whistles attached, is to use Netlify Dev which you can install via npm:

npm install netlify-cli -g

And then kick off your dev server like this:

netlify dev

Your "site" should now be live at http://localhost:8888. By default, Netlify hosts functions under the subpath /.netlify/functions/<fn-name> so you can invoke your function here:

http://localhost:8888/.netlify/functions/hello?name=Beth

Now, let's make our function's address a little cleaner by also taking advantage of another free Netlify feature using redirects. This allows us to expose the same functions at a terser url by replacing /.netlify/functions with /api.

FROM: <site>/.netlify/functions/hello TO: <site>/api/hello

To do so, append the following info to your netlify.toml config, and restart Netlify dev:

[[redirects]]
  from = '/api/*'
  to = '/.netlify/functions/:splat'
  status = 200

This will route all traffic at /api/* internally to the appropriate functions directory, and the wildcard will capture all additional path info, and move to :splat. By setting the HTTP Status Code = 200, Netlify will preform a "rewrite" (as opposed to a "redirect") which will change the server response without changing the URL in the browser address bar.

So let's try again with our new url:

http://localhost:8888/api/hello?name=Beth

👏 Awesome, you just created a function! (you're following along live, right?)

Getting the CRUD Out & Submitting Data

Now that we can build functions, let's create our own API with some basic CRUD functions (Create, Read, Update, & Delete) for a simple todos app.

One of the central tenants of serverless computing is that it's also stateless. If you need to store any state across function invocations, it should be persisted to another, layer like a database. For this article, let's use the free tier of DynamoDb, but feel free to BYODB (Bring Your Own DB), especially if it has a Node SDK.

In the next steps, we'll:

Setup a table on DynamoDB in AWS
Install npm packages into our project
Setup secret keys in AWS, and add to our environment variables
Initialize the aws-sdk package for NodeJs
And then finally add a Netlify function route to create a record on our database

AWS - Amazon Web Services

This guide will assume some degree of familiarity with AWS & DynamoDB, but if you're new to DynamoDB, you can start with this guide on Getting Started with Node.js and DynamoDB.

On AWS, create a table with the name NetlifyTodos, and string partition key called key.

NPM - Node Package Manager

Now, let's setup npm and install aws-sdk, nanoid, & dotenv.

In a terminal at the root of your project, run the following commands:

npm init -y
npm install aws-sdk nanoid dotenv --save

ENV - Environment Variables

You'll need to provision an access key / secret for an IAM user that we'll use to authenticate our API calls. One of the benefits of running these calls on the server is you're able to protect your application secret through environment variables, instead of having to ship them to the client, which is not recommended.

There are quite a few ways to log into AWS on your local machine, but just to keep everything inside of our project, let's create a .env file at the root of our project, and fill in the following keys with your own values:

# .env
MY_AWS_ACCESS_KEY_ID=***
MY_AWS_SECRET_ACCESS_KEY=***
MY_AWS_REGION=us-east-1

NOTE: One little gotcha here is that the more common AWS_ACCESS_KEY_ID is a reserved environment keyword used by the Netlify process. So if we want to pass around env variables, we'll have to use our own key, in this case prefixed with MY_.

Once they're added to the process, we can destructure them and use in setting up our AWS SDK. We'll need to setup AWS for every CRUD function, so let's assemble all this logic in a separate file called dyno-client.js.

// dyno-client.js
require('dotenv').config()
const { MY_AWS_ACCESS_KEY_ID, MY_AWS_SECRET_ACCESS_KEY, MY_AWS_REGION } = process.env

The following is required.

SDK - Software Developer Kit

Using the aws-sdk makes our life a lot easier for connecting to DynamoDB from our codebase. We can create an instance of the Dynamo client that we'll use for the remaining examples:

// dyno-client.js
const AWS = require("aws-sdk");

AWS.config.update({
    credentials: {
        accessKeyId: MY_AWS_ACCESS_KEY_ID,
        secretAccessKey: MY_AWS_SECRET_ACCESS_KEY
    },
    region: MY_AWS_REGION,
});

const dynamoDb = new AWS.DynamoDB.DocumentClient();

To make this available to all our functions, add the DynamoDB instance to your exports, and we'll grab it when we need it:

module.exports = { dynamoDb, TABLE_NAME }

Create Todo (Due by EOD 😂)

⚡ We're finally ready to create our API function!

In the following example, we'll post back form data containing the text for our todo item. We can parse the form data into JSON, and transform it into an item to insert into our table. If it succeeds, we'll return the result with a status code of 200, and if it fails, we'll return the the error message along with the status code from the error itself.

// functions/create.js
const { nanoid } = require("nanoid");
const { dynamoDb } = require("../dyno-client")

exports.handler = async(event, context) => {
    try {
        // parse form data
        const body = JSON.parse(event.body);

        // create item to insert
        const params = {
            TableName: TABLE_NAME,
            Item: {
                key: nanoid(7),
                text: body.text,
                createDate: new Date().toISOString(),
            },
        };

        let result = await dynamoDb.put(params).promise();

        // return success
        return {
            statusCode: 200,
            body: JSON.stringify({
                success: true,
                data: result,
            }),
        };

    } catch (error) {
        return {
            statusCode: error.statusCode || 500,
            body: JSON.stringify(error),
        };
    }

};

This should give you the gist of how to expose your API routes and logic to perform various operations. I'll hold off on more examples because most of the code here is actually just specific to DynamoDB, and we'll save that for a separate article. But the takeaway is that we're able to return something meaningful with very minimal plumbing. And that's the whole point!

With Functions, you only have to write your own business logic!

Debugging - For Frictionless Feedback Loops

There are two critical debugging tools in Visual Studio Code I like to use when working with node and API routes.

Script Debugger &
Rest Client Plugin

✨ Did you know, instead of configuring a custom launch.json file, you can run and attach debuggers directly onto npm scripts in the package.json file:

And while tools like Postman are a valuable part of comprehensive test suite, you can add the REST Client Extension to invoke API commands directly within VS Code. We can easily use the browser to mock GET endpoints, but this makes it really easy to invoke other HTTP verbs, and post back form data.

Just add a file like test.http to your project. REST Client supports expansion of variable environment, and custom variables. If you stub out multiple calls, you can separate multiple different calls by delimiting with ###.

Add the following to your sample file:

@baseUrl = http://localhost:8888

// create todo item
POST {{baseUrl}}/api/create
content-type: application/json

{
    "text": "Feed the cats",
}

We can now run the above by clicking "Send Request". This should hit our Netlify dev server, and allow us to step through our function logic locally!

Publishing

Publishing to Netlify is easy as well. Make sure your project is committed, and pushed up to a git repository on GitHub, GitLab or BitBucket.

Netlify will prompt for a Build command, and a Publish directory. Believe it or not, we don't actually have either of those things yet, and it's probably a project for another day to set up our front end. Those commands refer to the static site build part of the deployment. Everything we need to build serverless functions is inside our functions directory and our netlify.toml config.

Once we deploy the site, the last thing we'll need to do is add our environment variables to Netlify under Build > Environment

Next Steps - This is only the beginning

Hopefully some ideas are spinning as to how you can use these technologies on your own sites and projects. The focus of this article is on building and debugging Netlify functions, but an important exercise left to the reader is to take advantage of that on your front end.

TIP: If you want to add Create React App to your current directory (without creating a new folder), add a . when scaffolding out a new app like this:

create-react-app .

Try it out - build a front end, and let me know how it goes at KyleMitBTV!

For more context, you can browse the full source code for the article on GitHub at KyleMit/netlify-functions-demo.

For even more practical examples with actual code, checkout the following resources as well!

Good luck, and go build things!

This Dot is a consultancy dedicated to guiding companies through their modernization and digital transformation journeys. Specializing in replatforming, modernizing, and launching new initiatives, we stand out by taking true ownership of your engineering projects.

We love helping teams with projects that have missed their deadlines or helping keep your strategic digital initiatives on course. Check out our case studies and our clients that trust us with their engineering.

About the author(s)

Kyle Mitofsky
Full stack engineer with a love of all things web development. Passionate about inclusion, mentoring, learning, and minimal architectures.
@KyleMitBTV @KyleMit

Exploring Angular Forms: A New Alternative with Signals

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Recap: Angular Forms Approaches Before diving into the topic of enhancing template-driven forms with signals, let’s quickly recap Angular's traditional forms approaches: 1. Template-Driven Forms: Defined directly in the HTML template using directives like ngModel, these forms are easy to set up and are ideal for simple forms. However, they may not provide the fine-grained control required for more complex scenarios. Here's a minimal example of a template-driven form: ` ` 2. Reactive Forms: Managed programmatically in the component class using Angular's FormGroup, FormControl, and FormArray classes; reactive forms offer granular control over form state and validation. This approach is well-suited for complex forms, as my previous articles on Angular Reactive Forms discussed. And here's a minimal example of a reactive form: ` ` Introducing Signals as a New Way to Handle Form Reactivity With the release of Angular 16, signals have emerged as a new way to manage reactivity. Signals provide a declarative approach to state management, making your code more predictable and easier to understand. When applied to forms, signals can enhance the simplicity of template-driven forms while offering the reactivity and control typically associated with reactive forms. Let’s explore how signals can be used in both simple and complex form scenarios. Example 1: A Simple Template-Driven Form with Signals Consider a basic login form. Typically, this would be implemented using template-driven forms like this: ` ` This approach works well for simple forms, but by introducing signals, we can keep the simplicity while adding reactive capabilities: ` ` In this example, the form fields are defined as signals, allowing for reactive updates whenever the form state changes. The formValue signal provides a computed value that reflects the current state of the form. This approach offers a more declarative way to manage form state and reactivity, combining the simplicity of template-driven forms with the power of signals. You may be tempted to define the form directly as an object inside a signal. While such an approach may seem more concise, typing into the individual fields does not dispatch reactivity updates, which is usually a deal breaker. Here’s an example StackBlitz with a component suffering from such an issue: Therefore, if you'd like to react to changes in the form fields, it's better to define each field as a separate signal. By defining each form field as a separate signal, you ensure that changes to individual fields trigger reactivity updates correctly. Example 2: A Complex Form with Signals You may see little benefit in using signals for simple forms like the login form above, but they truly shine when handling more complex forms. Let's explore a more intricate scenario - a user profile form that includes fields like firstName, lastName, email, phoneNumbers, and address. The phoneNumbers field is dynamic, allowing users to add or remove phone numbers as needed. Here's how this form might be defined using signals: ` > Notice that the phoneNumbers field is defined as a signal of an array of signals. This structure allows us to track changes to individual phone numbers and update the form state reactively. The addPhoneNumber and removePhoneNumber methods update the phoneNumbers signal array, triggering reactivity updates in the form. ` > In the template, we use the phoneNumbers signal array to dynamically render the phone number input fields. The addPhoneNumber and removePhoneNumber methods allow users to reactively add or remove phone numbers, updating the form state. Notice the usage of the track function, which is necessary to ensure that the ngFor directive tracks changes to the phoneNumbers array correctly. Here's a StackBlitz demo of the complex form example for you to play around with: Validating Forms with Signals Validation is critical to any form, ensuring that user input meets the required criteria before submission. With signals, validation can be handled in a reactive and declarative manner. In the complex form example above, we've implemented a computed signal called formValid, which checks whether all fields meet specific validation criteria. The validation logic can easily be customized to accommodate different rules, such as checking for valid email formats or ensuring that all required fields are filled out. Using signals for validation allows you to create more maintainable and testable code, as the validation rules are clearly defined and react automatically to changes in form fields. It can even be abstracted into a separate utility to make it reusable across different forms. In the complex form example, the formValid signal ensures that all required fields are filled and validates the email and phone numbers format. This approach to validation is a bit simple and needs to be better connected to the actual form fields. While it will work for many use cases, in some cases, you might want to wait until explicit "signal forms" support is added to Angular. Tim Deschryver started implementing some abstractions around signal forms, including validation and wrote an article about it. Let's see if something like this will be added to Angular in the future. Why Use Signals in Angular Forms? The adoption of signals in Angular provides a powerful new way to manage form state and reactivity. Signals offer a flexible, declarative approach that can simplify complex form handling by combining the strengths of template-driven forms and reactive forms. Here are some key benefits of using signals in Angular forms: 1. Declarative State Management: Signals allow you to define form fields and computed values declaratively, making your code more predictable and easier to understand. 2. Reactivity: Signals provide reactive updates to form fields, ensuring that changes to the form state trigger reactivity updates automatically. 3. Granular Control: Signals allow you to define form fields at a granular level, enabling fine-grained control over form state and validation. 4. Dynamic Forms: Signals can be used to create dynamic forms with fields that can be added or removed dynamically, providing a flexible way to handle complex form scenarios. 5. Simplicity: Signals can offer a simpler, more concise way to manage form states than traditional reactive forms, making building and maintaining complex forms easier. Conclusion In my previous articles, we explored the powerful features of Angular reactive forms, from dynamic form construction to custom form controls. With the introduction of signals, Angular developers have a new tool that merges the simplicity of template-driven forms with the reactivity of reactive forms. While many use cases warrant Reactive Forms, signals provide a fresh, powerful alternative for managing form state in Angular applications requiring a more straightforward, declarative approach. As Angular continues to evolve, experimenting with these new features will help you build more maintainable, performant applications. Happy coding!...

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We're ready to be your trusted technical partners in your digital innovation journey.

Whether it's modernization or custom software solutions, our team of experts can guide you through best practices and how to build scalable, performant software that lasts.

Build your Backend with Netlify Functions in 20 Minutes

Build your Backend with Netlify Functions in 20 minutes

Use Cases - What can you build?

Composition of a Function

Walk Before You Run (Locally)

Getting the CRUD Out & Submitting Data

AWS - Amazon Web Services

NPM - Node Package Manager

ENV - Environment Variables

SDK - Software Developer Kit

Create Todo (Due by EOD 😂)

Debugging - For Frictionless Feedback Loops

Publishing

Next Steps - This is only the beginning

Kyle Mitofsky

You might also like

Exploring Angular Forms: A New Alternative with Signals

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Adding React to your ASP.NET MVC web app

AI Leadership: Data-Driven Decision Making & Avoiding "Analysis Paralysis" with Jerry Reghunadh

Let's innovate together!

You might also like

Exploring Angular Forms: A New Alternative with Signals

The Journey To Making A New Framework: TanStack Start with Tanner Linsley

Adding React to your ASP.NET MVC web app

AI Leadership: Data-Driven Decision Making & Avoiding "Analysis Paralysis" with Jerry Reghunadh