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.
GitHub on steroids
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A beautiful feature-rich GraphQL client for all platforms
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Redux DevTools for debugging application's state changes.
Powerful GraphIQL Explorer