# Writing Jira Expressions

- [Introduction to Jira Expressions](/workflow-building-blocks-for-jira/writing-jira-expressions/introduction-to-jira-expressions.md)
- [Jira Expressions Library: Examples & Use Cases](/workflow-building-blocks-for-jira/writing-jira-expressions/jira-expressions-library-examples-and-use-cases.md): This Jira expressions library provides practical examples and real-world use cases for using Jira expressions in workflow conditions and validators.
- [Writing validation messages](/workflow-building-blocks-for-jira/writing-jira-expressions/writing-validation-messages.md)