Provides a way to pass data through the component tree without having to pass props down manually at every level.

Is designed to share data that can be considered “global” for a tree of React components.

// Context lets us pass a value deep into the component tree
// without explicitly threading it through every component.
// Create a context for the current theme (with "light" as the default).
const ThemeContext = React.createContext('light');

class App extends React.Component {
  render() {
    // Use a Provider to pass the current theme to the tree below.
    // Any component can read it, no matter how deep it is.
    // In this example, we're passing "dark" as the current value.
    return (
      <ThemeContext.Provider value="dark">
        <Toolbar />

// A component in the middle doesn't have to
// pass the theme down explicitly anymore.
function Toolbar(props) {
  return (
      <ThemedButton />

class ThemedButton extends React.Component {
  // Assign a contextType to read the current theme context.
  // React will find the closest theme Provider above and use its value.
  // In this example, the current theme is "dark".
  static contextType = ThemeContext;
  render() {
    return <Button theme={this.context} />;

Context — Structure map

Clickable & Draggable!

Context — Related pages: