Many moons ago, Jared Forsyth was an intern at Facebook and he worked on re-writing react-devtools and integrating them with React Native. After he left, the React Native integration fell into disrepair and became unusable.

As of React Native 0.43 / React 16 alpha (Expo SDK 16), it is once again working (in simulator/emulator), thanks (I believe) to the efforts of Dan Abramov. To set it up, follow these steps, which I have paraphrased below:

npm install --save-dev react-devtools in your app directory.

in your app directory. Add “devtools”: “react-devtools” under scripts in package.json.

under in package.json. npm run devtools

Now when you run your app it will connect and display the component tree. Read more about what you can do with this in the react-devtools README.