Apache Daffodil

Apache Daffodil is an open-source implementation of the DFDL specification that uses DFDL data descriptions to parse fixed format data into an infoset. This infoset is commonly converted into XML or JSON to enable the use of well-established XML or JSON technologies and libraries to consume, inspect, and manipulate fixed format data in existing solutions. Daffodil is also capable of serializing or "unparsing" data back to the original data format. The DFDL infoset can also be converted directly to/from the data structures carried by data processing frameworks so as to bypass any XML/JSON overheads.

For more information about Daffodil, see https://daffodil.apache.org/.

Build Requirements

  • Java 8 or higher
  • sbt 0.13.8 or higher
  • C compiler C99 or higher
  • Mini-XML Version 3.0 or higher

See BUILD.md for more details and DEVELOP.md for a developer guide.

Getting Started

sbt is the officially supported tool to build Daffodil. Below are some of the more commonly used commands for Daffodil development.


Compile source code:

sbt compile


Check all unit tests pass:

sbt test

Check all integration tests pass:

sbt daffodil-test-integration/test


Check format of source and sbt files:

sbt scalafmtCheckAll scalafmtSbtCheck

Reformat source and sbt files if necessary:

sbt scalafmtAll scalafmtSbt


Build the Daffodil command line interface (Linux and Windows shell scripts in daffodil-cli/target/universal/stage/bin/; see the Command Line Interface documentation for details on their usage):

sbt daffodil-cli/stage

Publish the Daffodil jars to a Maven repository (for Java projects) or Ivy repository (for Scala or schema projects).

Maven (for Java or mvn):

sbt publishM2

Ivy (for Scala or sbt):

sbt publishLocal

Check Licenses

Run Apache RAT (license audit report in target/rat.txt and error if any unapproved licenses are found):

sbt ratCheck

Check Coverage

Run sbt-scoverage (report in target/scala-ver/scoverage-report/):

sbt clean coverage test daffodil-test-integration/test
sbt coverageAggregate

Getting Help

You can ask questions on the [email protected] or [email protected] mailing lists. You can report bugs via the Daffodil JIRA.


Apache Daffodil is licensed under the Apache License, v2.0.