Try Concerto in your browser
No install required. Write a .cto model and watch it compile live to TypeScript, Java, Go, JSON Schema, GraphQL, Protobuf and more — everything runs client-side in your browser.
concerto-playground.accordproject.org
Easy to Use
Designed from the ground up to be easy to learn, for both newcomers and data modeling pros.
Powerful Tools
Import your existing models, or convert Concerto models to 14+ output formats.
Built for the Web
Import models from URLs. Lightweight browser compatible runtime.
Schemas, for People too
Business and product teams are the domain experts, and we believe that they should own domain models too.
Popular schema languages are designed to be machine readable, but are not accessible for non-technical people.
Concerto strives for the expressiveness of UML, but with compatibility to modern technology stacks.
Popular schema languages are designed to be machine readable, but are not accessible for non-technical people.
Concerto strives for the expressiveness of UML, but with compatibility to modern technology stacks.
concept Address {
o String street
o String city
o String postCode
o Country country
}
concept Person identified by name {
o String name
o Address address optional
@description("Height (cm)")
o Double height range=[0.0,]
o DateTime dateOfBirth
}
enum Country {
o UK
o USA
o FRANCE
o GERMANY
o JAPAN
}
Platform Neutral, but Runtime Compatible
Concerto's code generation capabilities let you use models across multiple platforms. Supported targets include:
Apache Avro,
C# (.NET),
Go,
GraphQL,
Java,
JSON Schema,
Markdown,
Mermaid UML,
OData (EDM),
OpenAPI,
PlantUML,
Protocol Buffers,
Rust,
TypeScript,
XML Schema,
& custom formats.
Bootstrap your models from existing OpenAPI specifications, JSON Schema models, or natural language text such as agreements.
Bootstrap your models from existing OpenAPI specifications, JSON Schema models, or natural language text such as agreements.
Give it a try
No install needed — open the Playground
Launch the Playground ↗Ready to build? Install the CLI
npm i -g @accordproject/concerto-cliRead these