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In the Bitcoin ecosystem, there are tools like https://blockchain.info/decode-tx to decode a raw transaction. Is there a site that offers the equivalent for Ethereum?
I'm looking for an easy way to parse a raw transaction and make it human readable, without installing a library or broadcasting the transaction.
It perhaps doesn't meet the "it would be nice to give it to someone non-technical and allow them to parse it without using tools I've provided" qualifier, but the Ethslurp tool may be of use to people with at least some technical knowhow.
(As mentioned in an answer to this very similar previous question: Symbolic decoding of a transaction for Solidity.)
is ethereumjs-tx-unsign along the lines of what you're hoping to accomplish?
if so.. and you're also interested in obtaining even more information (from the signature), then the unsign() function in ethereumjs-tx-sign is a good place to look.
Circling back on this 4 years later: This is buried in MEW's Send Offline Helper. If you enter in the signed transaction in Step 3 and flip on the "Raw Transaction" switch it will break out the fields for you(Caveat: doesn't give you v,r,s; instead it gives you the from address).