Input Validation

PNR

Exactly 10 digits

Numeric input only

Reject malformed values early

Train Number

5 digits for train data; number lookup accepts 2–5 digit prefixes

Treat as string to preserve zeros

No spaces or symbols

Date

DD-MM-YYYY format

Validate real calendar date

Use same format across APIs

Station Code

Uppercase station code

Examples: NDLS, BCT, HWH

Trim extra whitespace