Piqi is a universal schema language and a collection of tools
built around it.
piqi is a command-line program that exposes some
of the tools:
for validating, pretty-printing and converting data between JSON, XML,
Protocol Buffers and Piq formats.
for working with the schemas, such as converting definitions between Piqi
.piqi) and Protocol Buffes (
.proto), and "compiling" Piqi definitions
into one of the supported portable data representation formats (JSON, XML,
Other Piqi sub-projects include:
Piq -- a human-friendly typed data representation
language. It is designed to be more convenient for viewing and editing data
compared to JSON, XML, CSV, S-expressions and other formats.
Piqi-RPC -- an RPC-over-HTTP system
for Erlang. It provides a simple way to expose Erlang services via JSON, XML
and Protocol Buffers over HTTP.
The Piqi project was inspired by Google Protocol Buffers and designed to be
largely compatible with it. Like Protocol Buffers, Piqi relies on type
definitions and supports schema evolution. The main differences is that Piqi has
a richer data model, high-level modules, standard mappings to JSON and XML, and
comes with a powerful data representation format (Piq). Also, Piqi is a lot more
Full project description and documentation can be found at
See INSTALL for the installation instructions.
If you found a bug or have any suggestions please submit a GitHub issue:
Participation and patches are very welcome! Check TODO list for ideas.
The best way to submit a contribution is to open a pull request on GitHub
For discussions about the usage, development, and future of Piqi there is the
Piqi Google Group:
src/ "piqi" command-line utility piqilib/ common library used by piqi command-line tool and piqi-ocaml piqi/ Piqi self-specification doc/ project documentation make/ makefiles and build scripts deps/ third-party dependencies downloaded and built by `make deps`