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How to Fix Internal JSON-RPC Error in Metamask: A Comprehensive Guide Encountering an Internal JSON-RPC Error in MetaMask can be frustrating for users trying to interact with decentralized applications or manage their crypto assets. This common issue can occur for various reasons, but fortunately, there are several effective solutions. In this article, we’ll explore what causes the Internal JSON-RPC Error in MetaMask and provide step-by-step instructions to resolve it.