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Version: v1
For the complete documentation index, see llms.txt

Compact toolchain

Compact is Midnight's smart contract programming language, designed for building secure, efficient, and adaptable decentralized applications.

The Compact toolchain includes the Compact compiler, formatter, and the Compact "fixup" tool. The compiler translates Compact smart contract code into JavaScript implementations and a representation of the zero-knowledge circuits.

Link to related documentation

To install the toolchain, first install the compact devtools and then use compact update (for the latest version) or compact update 0.28.0 (for a specific version, such as 0.28.0 in this case).

Release 0.34.0LATEST

Compact language 0.26.0

25 August 2026

Artifacts

Summary

  • Builds on 0.33.0: ledger version 9, cross-contract calls, events, serialization of Compact values, ZKIR version 3
  • Cross-contract callees can perform shielded (Zswap) coin operations
  • Language version 0.26.0 and Compact runtime 0.19.0
  • Targets ledger 9, which is not yet deployed on the public networks; use compact update 0.31 for contracts deployed today