Webiny Project Structure

TL;DR

A Webiny project has a flat structure centered around webiny.config.tsx -- the single configuration file where all extensions are registered. Custom code lives in the extensions/ folder. Extensions are registered as React components (<Api.Extension>, <Admin.Extension>, <Infra.*>, <Cli.Command>) and can be conditionally loaded per environment.

Project Layout

my-webiny-project/
├── extensions/          # All custom code -- API, Admin, Infra, CLI extensions
│   └── README.md
├── public/              # Static assets for the Admin app
│   ├── favicon.ico
│   ├── global.css
│   ├── index.html
│   └── robots.txt
├── package.json         # Single package.json for the whole project
├── tsconfig.json        # Single TypeScript config
├── webiny.config.tsx    # Main configuration -- all extensions registered here
├── webiny-env.d.ts      # TypeScript environment types
└── yarn.lock

Key points:

• Single package.json -- no monorepo, no workspaces needed.
• Single tsconfig.json -- straightforward TypeScript setup.
• webiny.config.tsx -- the entry point for everything. All extensions, infrastructure options, and project settings are declared here.
• extensions/ -- where all your custom code lives. Organize with subfolders as needed (e.g., extensions/contactSubmission/, extensions/AdminBranding/).

The webiny.config.tsx File

This file exports a single React component called Extensions. It uses JSX to declaratively register all configuration:

// webiny.config.tsx
import React from "react";
import { Admin, Api, Cli, Infra, Project, Security } from "webiny/extensions";
import { Cognito } from "@webiny/cognito";

export const Extensions = () => {
  return (
    <>
      {/* Infrastructure configuration */}
      <Infra.Aws.DefaultRegion name={"us-east-1"} />
      <Infra.OpenSearch enabled={true} />
      <Infra.Aws.Tags tags={{ OWNER: "me", PROJECT: "my-project" }} />

      {/* Identity provider */}
      <Cognito />

      {/* API extensions (backend) */}
      <Api.Extension src={"/extensions/ProductCategoryModel.ts"} />
      <Api.Extension src={"/extensions/ProductModel.ts"} />
      <Api.Extension src={"/extensions/contactSubmission/ContactSubmissionHook.ts"} />

      {/* Security hooks */}
      <Api.Extension src={"/extensions/MyApiKey.ts"} />
      <Security.ApiKey.AfterUpdate src={"/extensions/MyApiKeyAfterUpdate.ts"} />

      {/* Admin extensions (frontend) */}
      <Admin.Extension src={"/extensions/AdminTheme/AdminTheme.tsx"} />
      <Admin.Extension src={"/extensions/AdminTitleLogo/AdminTitleLogo.tsx"} />
      <Admin.Extension src={"/extensions/contactSubmission/EmailEntryListColumn.tsx"} />

      {/* Infrastructure / Pulumi extensions */}
      <Infra.Core.Pulumi src={"/extensions/MyCorePulumiHandler.ts"} />

      {/* CLI extensions */}
      <Cli.Command src={"/extensions/MyCustomCommand.ts"} />

      {/* Project settings */}
      <Project.Telemetry enabled={false} />
    </>
  );
};

Extension Types

YOU MUST include the full file path with the .ts or .tsx extension in every src prop. For example, use src={"/extensions/MyModel.ts"}, NOT src={"/extensions/MyModel"}. Omitting the file extension will cause a build failure.

YOU MUST use export default for the createImplementation() call when the file is targeted directly by an Extension src prop. Using a named export (export const Foo = SomeFactory.createImplementation(...)) will cause a build failure. Named exports are only valid inside files registered via createFeature.

Infrastructure Components

Declarative components for configuring AWS infrastructure:

Environment-Conditional Configuration

Use <Infra.Env.Is> to load extensions or config only in specific environments:

<Infra.Env.Is env="prod">
    <Infra.Aws.Tags tags={{ ENV: "production" }} />
    <Infra.OpenSearch enabled={true} />
</Infra.Env.Is>

<Infra.Env.Is env={["dev", "staging"]}>
    <Infra.Aws.Tags tags={{ ENV: "non-production" }} />
    <Infra.OpenSearch enabled={false} />
</Infra.Env.Is>

Build Parameters

Build parameters pass values from config to extensions at build time. They are accessed in backend code via the BuildParams DI service (see dependency-injection skill).

Rule: <Api.BuildParam> and <Admin.BuildParam> MUST live inside the extension's Extension.tsx, NOT directly in webiny.config.tsx. Required parameters are exposed as React props on the extension component. The consumer in webiny.config.tsx decides where the value comes from (env var, hardcoded, config, etc.).

// extensions/myExtension/Extension.tsx
import React from "react";
import { Api } from "webiny/extensions";

interface MyExtensionProps {
  apiKey: string;
}

export const MyExtension = ({ apiKey }: MyExtensionProps) => {
  return (
    <>
      <Api.BuildParam paramName="MY_API_KEY" value={apiKey} />
      <Api.Extension src={"@/extensions/myExtension/features/myService/feature.ts"} />
    </>
  );
};

// webiny.config.tsx — consumer decides where the value comes from
<MyExtension apiKey={process.env.MY_API_KEY || ""} />

This keeps extensions self-contained — all required configuration is declared via typed props in one place.

Installing Pre-Built Extensions

Webiny provides official extensions you can install with:

yarn webiny extension <extension-name>

This downloads the extension code into extensions/, updates webiny.config.tsx to register it, and gives you full access to modify the code.

Related Skills

• webiny-dependency-injection -- How extensions use DI to access services
• webiny-local-development -- How to deploy and develop locally
• webiny-full-stack-architect -- Full-stack extension skeleton, entry points, and shared domain layer