JCL Syntax Validator & COND Code Flow Visualizer
Audit z/OS JCL syntax rules (Cols 1-71), simulate complex COND return-code step branching (RC 0, 4, 8, 12, 16), and translate cryptic DD/DISP parameters into plain English.
Job Control Language (JCL) directs IBM z/OS batch processing. One of the most infamous pitfalls in mainframe programming is the `COND=(code, operator)` parameter—where the condition is a bypass condition (e.g. `COND=(4,LT,STEP01)` means "Bypass this step if 4 is LESS THAN STEP01's return code", meaning bypass if RC > 4). Use the simulator below to validate your JCL syntax and visualize exact step execution paths.
Step Return Code Simulator
Change previous step return codes to simulate how downstream `COND` checks bypass or execute subsequent steps in real-time:
Batch Pipeline Execution Flowchart
JOB COMPLETED (RC=0)z/OS JCL Syntax & Column 1–71 Linter
Paste full JCL job stream to check for column alignment, comma continuations, and invalid keywords.
JCL DD, DISP & SPACE Parameter Explainer
Translate cryptic dataset allocation parameters into human-readable English descriptions.
DISP=(Status, Normal, Abnormal)
SPACE=(Unit, (Primary, Sec), RLSE)
DCB=(RECFM, LRECL, BLKSIZE)
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