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HTML

CSS

CSS Base

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Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

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Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

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Visit your global Editor Settings.

HTML

              
                <script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script>

<div id="app"></div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Russo+One');
$darkAccent: #224b4b;
$lightAccent: #2cda9d;
$backgroundBase: #619e9e;

$shadow: 1px 1px 10px 2px darken($backgroundBase, 20%);
$default-border: 1px solid darken($backgroundBase, 35%);

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji',
    'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  background: lighten($backgroundBase, 12%);
  margin: 10px 0;
}

.colorScheme {
  background-color: lighten($backgroundBase, 30%);
  border: $default-border;
  box-shadow: $shadow;
  border-top: none;
}

.toolbar {
  display: flex;
  align-items: center;
  background-color: lighten($darkAccent, 25%);
  padding: 0.3rem;
  border: $default-border;
  box-shadow: $shadow;
  font-family: Russo One;
  font-size: 1rem;
  color: black;
  i {
    width: 25px;
    margin-left: 5px;
  }
  .fa-arrows-alt,
  .fa-compress {
    margin-left: auto;
  }
}

.fa-retweet,
.fa-compress,
.fa-arrows-alt {
  &:hover {
    color: lighten($lightAccent, 10%);
    cursor: pointer;
  }
}

.fa-free-code-camp {
  margin-right: 3px;
}

.editorWrap {
  max-width: 600px;
  margin: 1.125rem auto;
  .toolbar {
    width: 99%;
  }
  textarea {
    @extend .colorScheme;
    width: 99%;
    min-height: 200px;
    margin-bottom: -5px;
    resize: vertical;
    outline: none;
    padding-left: 5px;
    padding-top: 5px;
    font-size: 0.875rem;
  }
}

.converter {
  width: 100px;
  text-align: center;
  font-size: 35px;
  margin: auto;
}

.previewWrap {
  @extend .colorScheme;
  max-width: 800px;
  margin: 1.25rem auto;
  min-height: 200px;
  overflow-wrap: break-word;
}

@media screen and (max-width: 850px) {
  .previewWrap {
    max-width: 630px;
  }
  .editorWrap {
    max-width: 550px;
  }
}

.maximized {
  width: 96%;
  min-height: 100vh;
  margin: auto;
  textarea {
    min-height: 95vh;
    resize: none;
  }
}

.hide {
  display: none;
}

@media screen and (max-width: 650px) {
  body {
    margin: 5px 0;
  }
  .editorWrap {
    width: 80vw;
    margin: 0 auto;
  }
  .maximized {
    width: 95%;
    margin: auto;
  }
  .previewWrap {
    width: 90vw;
  }
}

// MARKDOWN STYLES
#preview {
  padding: 0 1rem;

  blockquote {
    border-left: 3px solid #224b4b;
    color: #224b4b;
    padding-left: 5px;
    margin-left: 25px;
  }

  > p > code {
    padding: 3px;
  }

  code {
    background: white;
    font-size: 0.875rem;
    font-weight: bold;
  }

  pre {
    display: block;
    overflow: auto;
    background: white;
    padding: 5px;
    line-height: 1.2;
  }

  h1 {
    border-bottom: 2px solid $darkAccent;
  }

  h2 {
    border-bottom: 1px solid $darkAccent;
  }

  table {
    border-collapse: collapse;
  }

  td,
  th {
    border: 2px solid $darkAccent;
    padding-left: 5px;
    padding-right: 5px;
  }

  img {
    display: block;
    max-width: 90%;
    margin: 2rem auto;
  }
}

@media screen and (max-width: 420px) {
  body {
    font-size: 0.875rem;
  }
}

              
            
!

JS

              
                /* globals marked, Prism, React, ReactDOM */
/* eslint-disable react/prop-types, no-nested-ternary */

// View a more complex version of this project with custom toolbar here:
// https://codepen.io/no_stack_dub_sack/pen/JbPZvm?editors=0110

// coded by @no-stack-dub-sack (github) / @no_stack_sub_sack (Codepen)

// eslint-disable-next-line no-unused-vars
const projectName = 'markdown-previewer';

// ALLOWS LINE BREAKS WITH RETURN BUTTON
marked.setOptions({
  breaks: true,
  highlight: function (code) {
    return Prism.highlight(code, Prism.languages.javascript, 'javascript');
  }
});

// INSERTS target="_blank" INTO HREF TAGS (required for Codepen links)
const renderer = new marked.Renderer();
renderer.link = function (href, title, text) {
  return `<a target="_blank" href="${href}">${text}</a>`;
};

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      markdown: placeholder,
      editorMaximized: false,
      previewMaximized: false
    };
    this.handleChange = this.handleChange.bind(this);
    this.handleEditorMaximize = this.handleEditorMaximize.bind(this);
    this.handlePreviewMaximize = this.handlePreviewMaximize.bind(this);
  }
  handleChange(e) {
    this.setState({
      markdown: e.target.value
    });
  }
  handleEditorMaximize() {
    this.setState({
      editorMaximized: !this.state.editorMaximized
    });
  }
  handlePreviewMaximize() {
    this.setState({
      previewMaximized: !this.state.previewMaximized
    });
  }
  render() {
    const classes = this.state.editorMaximized
      ? ['editorWrap maximized', 'previewWrap hide', 'fa fa-compress']
      : this.state.previewMaximized
      ? ['editorWrap hide', 'previewWrap maximized', 'fa fa-compress']
      : ['editorWrap', 'previewWrap', 'fa fa-arrows-alt'];
    return (
      <div>
        <div className={classes[0]}>
          <Toolbar
            icon={classes[2]}
            onClick={this.handleEditorMaximize}
            text="Editor"
          />
          <Editor markdown={this.state.markdown} onChange={this.handleChange} />
        </div>
        <div className="converter" />
        <div className={classes[1]}>
          <Toolbar
            icon={classes[2]}
            onClick={this.handlePreviewMaximize}
            text="Previewer"
          />
          <Preview markdown={this.state.markdown} />
        </div>
      </div>
    );
  }
}

const Toolbar = (props) => {
  return (
    <div className="toolbar">
      <i className="fa fa-free-code-camp" title="no-stack-dub-sack" />
      {props.text}
      <i className={props.icon} onClick={props.onClick} />
    </div>
  );
};

const Editor = (props) => {
  return (
    <textarea
      id="editor"
      onChange={props.onChange}
      type="text"
      value={props.markdown}
    />
  );
};

const Preview = (props) => {
  return (
    <div
      dangerouslySetInnerHTML={{
        __html: marked(props.markdown, { renderer: renderer })
      }}
      id="preview"
    />
  );
};

const placeholder = `# Welcome to my React Markdown Previewer!

## This is a sub-heading...
### And here's some other cool stuff:

Heres some code, \`<div></div>\`, between 2 backticks.

\`\`\`
// this is multi-line code:

function anotherExample(firstLine, lastLine) {
  if (firstLine == '\`\`\`' && lastLine == '\`\`\`') {
    return multiLineCode;
  }
}
\`\`\`

You can also make text **bold**... whoa!
Or _italic_.
Or... wait for it... **_both!_**
And feel free to go crazy ~~crossing stuff out~~.

There's also [links](https://www.freecodecamp.org), and
> Block Quotes!

And if you want to get really crazy, even tables:

Wild Header | Crazy Header | Another Header?
------------ | ------------- | -------------
Your content can | be here, and it | can be here....
And here. | Okay. | I think we get it.

- And of course there are lists.
  - Some are bulleted.
     - With different indentation levels.
        - That look like this.


1. And there are numbered lists too.
1. Use just 1s if you want!
1. And last but not least, let's not forget embedded images:

![freeCodeCamp Logo](https://cdn.freecodecamp.org/testable-projects-fcc/images/fcc_secondary.svg)
`;

ReactDOM.render(<App />, document.getElementById('app'));

              
            
!
999px

Console