Inspect data in the store of your Relay apps, and how that data changes over time in response to GraphQL queries, and client mutations. Note: Requires use of Relay Modern v1.4.0 or higher.
You can Follow the below Step By Step procedure to install the Relay DevTools Chrome Extension to your Chrome Web browser.
It is the Relay DevTools Chrome extension download link you can download and install Chrome Browser.
A beautiful feature-rich GraphQL client for all platforms
Adds Reason to the browser
GraphQL debugging tools for Apollo Client.
Manages DevTools with Node V8 Inspector (node --inspect) Debugging Workflow
Powerful GraphIQL Explorer
Simplifies the GitHub interface and adds useful features
GitHub on steroids
Adds Relay debugging tools to the Chrome Developer Tools.
Makes Immutable JS objects more readable when they are logged to the console.
Redux DevTools for debugging application's state changes.