Websocket onMessage error with string (parse)

[yogaajs]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Viem Version

2.21.55

Current Behavior

Some provider return a string on error, here getBlock.io, return a string "rate limit reached" instead of an object:

Error

SyntaxError: Unexpected token 'r', "rate limit reached" is not valid JSON
    at JSON.parse (<anonymous>)
    at WebSocket.onMessage (.../node_modules/viem/utils/rpc/webSocket.ts:39:25)

Websocket.ts

      function onMessage({ data }: MessageEvent) {
        onResponse(JSON.parse(data))
      }

I'm calling RPC function "getBlockReceipts" after subscribing to newHeads event.

Expected Behavior

No response

Steps To Reproduce

  import { createPublicClient, webSocket, http, toHex } from 'viem'
  import { mainnet } from 'viem/chains'
  
  const client = createPublicClient({
      chain: mainnet,
      transport: webSocket(providers.getblock.base.wss),
  });

  const startBlock = blockNumber - 10n;
  const blockNumbers = Array.from({ length: 10 }, (_, i) => toHex(startBlock + BigInt(i)));
  
  // Create an array of promise calls for getBlockReceipts.
  const promises = blockNumbers.map((hexBlockNumber) =>
      client.request({
          method: "eth_getBlockReceipts",
          params: [hexBlockNumber],
      })
  );

  try {
      // Wait for all the receipt calls to resolve concurrently.
      const receipts = await Promise.all(promises);
      console.log('Block receipts:', receipts?.[0]?.blockNumber);
  } catch (error) {
      console.error('Error fetching block receipts:', error);
  }

Link to Minimal Reproducible Example

No response

Anything else?

No response

[Swarnim-Chandve]

Hello, I would like to work on this issue.

[yogaajs]

Check: #3389