ABI Decoder

Decode contract ABIs and human-readable call data.

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How to use

  1. Paste your contract ABI JSON.
  2. Paste hex calldata or a log payload.
  3. Run decode to see the function selector and arguments.
  4. Copy results for docs, tests, or incident response.

Features

  • Decode contract ABIs and human-readable call data.
  • Works alongside the Web3 hub for full-stack debugging.

Related tools

Guides

Read related engineering guides on JsonOnlineParse.

FAQ

What can I decode?

Contract ABI JSON plus calldata or logs to recover function names and arguments.

Does calldata leave my machine?

Decoding runs locally in your browser; only RPC calls you initiate hit external nodes.

Is this free?

Yes. The ABI decoder is a free developer utility.