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Custom errors in Solidity 0.8.4+ save deployment gas and carry typed revert data. Learn when to use them and how to decode them off-chain.
Solidity custom errors replace costly revert strings with 4-byte selectors, cutting bytecode size and making reverts easier to decode off-chain.
Replace require strings with Solidity custom errors to cut revert gas costs and get structured, decodable failure data. Works from 0.8.4 onward; requires ABI publishing for explorer support.
Learn how Solidity custom errors replace expensive string reverts, reduce gas, and stay decodable by tooling. Includes a practical example, verification steps, and trade‑off discussion.
Learn how to replace revert reason strings with Solidity custom errors (since 0.8.4) to cut deployment costs, keep revert semantics, and enable typed error data that off‑chain tools can decode.
Learn how Solidity custom errors (since 0.8.4) cut deployment size, provide typed revert data, and simplify testing—complete with a token‑gated example, trade‑offs, and verification steps.
Solidity custom errors (0.8.4+) give you typed, ABI-decodable, gas-cheaper failures than revert strings. Here's the syntax, a worked Foundry test, and the real trade-offs.
Solidity custom errors (v0.8.4+) replace revert strings with a 4‑byte selector and typed arguments, cutting bytecode size and gas on failure.
Custom errors replace revert strings with typed, named parameters — saving ~500–800 gas per revert. Declare them in a shared file, trigger with revert ErrorName(args), and frontends decode automatically via the ABI. Includes a worked token example, gas comparison table, and verification steps.
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