CUE - Configure, Unify, Execute

CUE makes it easy to validate data, write schemas,
and ensure configurations align with policies.

CUE works with a wide range of tools and formats that you're already using
such as Go, JSON, YAML, TOML, OpenAPI, Protobuf, and JSON Schema.

For more information and documentation, including tutorials and guides, see cuelang.org.

Download and Install

The full range of installation methods for the cue command are listed on
cuelang.org,
including the official container image suitable for use with Docker.
Here are two common ways to install the command:

Release builds

Download the latest release from GitHub.

Install from Source

You need Go 1.24 or later to install CUE from source:

go install cuelang.org/go/cmd/cue@latest

You can also clone the repository and build it directly via go install ./cmd/cue.

Learning CUE

The fastest way to learn the basics is to follow the language tour on the website.

The cuelang.org website also contains
more documentation, including
tutorials,
how-to guides,
concept guides, and
references.

Popular references

• The official CUE Language Specification
• The CUE Go API on pkg.go.dev
• Builtin packages and functions
  available from CUE programs
• The cue command,
  a versatile interface for working with data, CUE, and its ecosystem

Go release support policy

As a general rule, we support the two most recent major releases of Go,
matching Go's security policy.
For example, if CUE v0.7.0 is released when Go's latest version is 1.21.5,
v0.7.x including any following bugfix releases will require Go 1.20 or later.

Contributing

To contribute, please read the Contribution Guide.

Code of Conduct

Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of Conduct.

Contact

• Ask questions via GitHub Discussions
• Chat with us on Slack and Discord
• Subscribe to our Community Calendar for community updates, demos, office hours, etc

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Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.