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I am finding it difficult to see the difference between these two, what are their respective use cases?

2 Answers 2

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Hi Developer advocate from Chainstack here.

Basically provider.sendTransaction takes in a hexed string of signed tx as its parameter. signer.sendTransaction takes a transaction object as the parameter.

Unless you already have the decoded tx string, you need to use signer.signTransaction before sending a transaction using provider.sendTransaction.

In fact from ether.js's source code, this is exactly how it is done at the back.

async sendTransaction(transaction: Deferrable<TransactionRequest>): Promise<TransactionResponse> 
{
  this._checkProvider("sendTransaction");
  const tx = await this.populateTransaction(transaction);
  const signedTx = await this.signTransaction(tx);
  return await this.provider.sendTransaction(signedTx);
}

Hope this helps, happy coding!

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  • he needs to use signer.sendTransaction , because I don't think he signs it somewhere else
    – Nulik
    Jan 26, 2023 at 15:26
  • Not sure about that but yeah signer.sendTransaction is much more straightforward in most cases.🤔 Jan 30, 2023 at 2:59
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A signer is a concept from ethersjs ( check their docs). Basically, it's a provider (another ethersjs concept, perhaps a little more transparent, that is just an abstraction of a connection to the ETH network (through an RPC)) + a private key (in practice, it's usually Metamask). Typically, if the signer is metamask, signer.sendTransaction will prompt the user with a metamask pop-up asking them to sign and broadcast the transaction.

Provider.sendTransaction expects an already signed transaction as input, and will simply broadcast it.

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