zProcFlow

A VS Code extension for mainframe developers that expands JCL procedures with SET parameter support, symbolic parameter substitution, DD statement overrides, and control card expansion.

Important Notes

• The extension does not connect to a mainframe or perform any actions. It only processes JCL code within the VS Code Workspace.

• All JCL subcomponents—such as Procedures, Control Cards, and Include Members—must be available within the same Git repository or located in the VS Code workspace.

Features

• Ctrl+Click navigation on PROC names to expand them
• SET parameter support from INCLUDE members and direct statements
• Symbolic parameter substitution (&PARAM → actual values)
• DD statement overrides for dataset names
• Control card expansion in DD statements
• Multi-line parameter support
• Configurable file extensions
• Case-insensitive file matching

Installation

1. Open VS Code Extensions (Ctrl+Shift+X)
2. Search for "zProcFlow"
3. Click Install

Usage

1. Open a JCL file
2. Ctrl+Click (or Cmd+Click on Mac) on a PROC name in an EXEC statement
3. The expanded PROC opens with substituted parameters and expanded control cards

Configuration

"zprocflow.proc.fileExtensions": ["prc", "proc"],
"zprocflow.util.fileExtensions": ["utl", "ctl", "scmd", "util"],
"zprocflow.convertToUppercase": true