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.
How to fix the “Internal JSON-RPC Error” on MetaMask?
According to the official MetaMask documentation on JSON-RPC errors, the meaning of the Internal JSON-RPC Error message is “an internal JSON-RPC error, often caused by a bad or invalid payload”. This is a standard error defined in the JSON-RPC protocol.
There are four main steps you can take to try and fix this error.
Check if you added the network correctly
Check that the network you’re trying to interact with has been added to your MetaMask correctly. If you are unsure, we recommend you consult MetaMask’s official guide for adding networks to MetaMask.
Check that you have enough tokens to pay gas fees
Make sure that you have enough tokens in your wallet to pay the gas fee associated with the transaction you’re trying to make. Keep in mind that different blockchain networks use different tokens for gas (for example ETH on Ethereum and BNB on BNB Chain).
Check if you’re using the latest version of MetaMask
Check if you’re using the most recent version of your MetaMask or browser extension. Sometimes, simply updating your wallet software will get rid of the Internal JSON-RPC Error message.
You can update your MetaMask browser extension by heading over to the Chrome web store and searching for MetaMask. If you only see the “Remove from Chrome” button, your MetaMask extension is up to date. Otherwise, you will have 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 there is an update available, the store should display a prompt allowing you to install it.
Try changing the endpoint provider
You can also try to fix the Internal JSON-RPC error by changing the endpoint provider you’re using. You can do so by going into the “Settings” section of your MetaMask extension and selecting “Networks”. Then, choose the network you’re having trouble with and change the URL in the “New RPC URL” section.
You can find an extensive list of endpoint providers for the Ethereum mainnet and other blockchain networks on ChainList.
What is JSON-RPC?
JSON-RPC is a remote procedure call protocol. The name of the protocol is derived from:
JSON (JavaScript Object Notation): A very commonly used file and data interchange format.
RPC (remote procedure call): A technique used in distributed computing in which a program executes a procedure or function on a different address space, for example on another physical machine, as if it were a local call.
The bottom line
Hopefully, one of the methods we’ve outlined above has helped you fix the Internal JSON-RPC Error on MetaMask and you’re able to make transactions again. If you want to learn more about errors that are commonly encountered by cryptocurrency users, make sure to check out the following articles:
How to fix “Insufficient Liquidity for This Trade”?
How to fix “Swap Failed” on Uniswap?
