IDL (Interface Definition Language)

 In Solana Anchor, an IDL (Interface Definition Language) file is a JSON description of your smart contract that includes:

  • Program name & address

  • Instructions (methods your program exposes)

  • Accounts (data layout for on-chain accounts)

  • Types (custom types or structs used)

  • Events & Errors (if any)

The IDL is automatically generated by Anchor and is used by clients (like web frontends or scripts) to interact with your smart contract easily — similar to an ABI in Ethereum.


When you anchor build IDL file is generated.



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