How to Fix the "Internal JSON-RPC Error" on MetaMask

The “Internal JSON-RPC Error†is sometimes encountered by users of the MetaMask wallet and can be caused by a variety of issues. Although dealing with the Internal JSON-RPC Error can be frustrating, there are thankfully a number of things you can do to try and fix it. We’ll show you four things you can do to fix the Internal JSON-RPC Error on MetaMask.

When using the MetaMask wallet, users may occasionally encounter the "Internal JSON-RPC Error." This error can be brought on by a variety of problems.

Thankfully, there are a number of steps you can take to try and resolve the Internal JSON-RPC Error. We'll show you four techniques to fix the Internal JSON-RPC Error on MetaMask in this post.

How do you fix the "Internal JSON-RPC Error" on MetaMask?

According to the official MetaMask documentation on JSON-RPC errors, the Internal JSON-RPC Error message indicates "an internal JSON-RPC error, usually caused by a bad or invalid payload." This is a standard JSON-RPC protocol error.

You can try four main steps to fix this error.

Check if you added the network correctly

Verify that the MetaMask network you're attempting to interact with has been properly added. If you're unsure, we advise visiting MetaMask's official instructions for adding networks to MetaMask.

Check that you have enough tokens to pay gas fees

Verify that your wallet contains a sufficient number of tokens to cover the gas cost for the transaction you're attempting to perform. Different blockchain networks use different tokens for gas (e.g., ETH on Ethereum and BNB on BNB Chain).

Check if you're using the latest version of MetaMask

Verify that you're using the most recent MetaMask browser extension or mobile app version. Occasionally, just updating your wallet software will resolve the Internal JSON-RPC Error message.

You can update your MetaMask browser extension by visiting the Chrome Web Store and searching for "MetaMask." If the only button you see is "Remove from Chrome," your MetaMask extension is current. Otherwise, you'll be given the option to update the extension.

If you're using the MetaMask mobile application, go to either the App Store (iOS) or the Play Store (Android) and search for "MetaMask." If an update is available, the store will prompt you to install it.

Try changing the endpoint provider

You can also try changing the endpoint provider you're using to resolve the Internal JSON-RPC error. To do this, navigate to the "Settings" section of your MetaMask extension and choose "Networks." Next, choose the problematic network and change the URL in the "New RPC URL" section.

ChainList provides a thorough directory of endpoint providers for the Ethereum mainnet and other blockchain networks.

What is JSON-RPC?

JSON-RPC is a remote procedure call protocol over HTTP that uses JSON to encode its requests and responses. The protocol is designed to be lightweight, extensible, and simple to implement.

The name of the protocol is derived from:

JSON: The protocol uses JSON for encoding its requests and responses.

RPC: The protocol is used for making remote procedure calls.

The bottom line

One of the techniques outlined above should have resolved the Internal JSON-RPC Error on MetaMask, allowing you to resume making transactions. If you're interested in learning more about cryptocurrency user errors, check out the following articles: