Create a new component in a JSS Next.js app using the code-first development workflow

Version: 22.x

Creating new components is one of the most common tasks performed while developing JSS applications. JSS Next.js applications provide a scaffolding script, defined in the file scripts/scaffold-component.ts to facilitate the creation of new components.

This procedure demonstrates how to use the scaffolding script to create a new component in your JSS Next.js app using the code-first development workflow.

To create a component in a Next.js JSS application:

In a terminal, in the root directory of your Next.js project, start the application by running the script:
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```
jss start
```
Tip

In your browser, go to http://localhost:3000/ to see your code changes in real-time.
Open a new terminal tab/window. In your application's root directory, run:
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```
jss scaffold MyComponent
```
Tip

The scaffolding system emits a simple working component. You can modify the scaffolding conventions in src/scripts/scaffold-component.js.

In the application's root directory, in the file sitecore/definitions/components/MyComponent.sitecore.ts containing the manifest definition for the new component, define the data fields for the component. For example:

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// eslint-disable-next-line no-unused-vars
import { CommonFieldTypes, SitecoreIcon, Manifest } from '@sitecore-jss/sitecore-jss-dev-tools';

/**
 * Adds the MyComponent component to the disconnected manifest.
 * This function is invoked by convention (*.sitecore.ts) when 'jss manifest' is run.
 * @param {Manifest} manifest Manifest instance to add components to
 */
export default function MyComponent(manifest: Manifest): void {
  manifest.addComponent({
    name: 'MyComponent',
    icon: SitecoreIcon.DocumentTag,
    fields: [{ name: 'heading', type: CommonFieldTypes.SingleLineText }],
    /*
    If the component implementation uses <Placeholder> or withPlaceholder to expose a placeholder,
    register it here, or components added to that placeholder will not be returned by Sitecore:
    placeholders: ['exposed-placeholder-name']
    */
  });
}

In the filesrc/components/MyComponent.tsx, implement the React component. For example:

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import { Text, Field, withDatasourceCheck } from '@sitecore-jss/sitecore-jss-nextjs';
import { StyleguideComponentProps } from 'lib/component-props';

type MyComponentProps = StyleguideComponentProps & {
  fields: {
    heading: Field<string>;
  };
};

const MyComponent = (props: MyComponentProps): JSX.Element => (
  <div>
    <p>MyComponent Component</p>
    <Text field={props.fields.heading} />
  </div>
);

The newly created component is inactive until added to a layout on a route. Add the component to a route layout. In this example, we add the component to the root route to the default placeholder jss-main. In the file /data/routes/en.yml, add your component to the array of components under the jss-main placeholder:
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```
placeholders:
  jss-main:
  - componentName: MyComponent
    fields:
      heading: Hello, Next.js!
  - componentName: ContentBlock
    fields:
      heading: Welcome to Sitecore JSS
```
Check your browser. The new component displays at the top of the page.

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