Data Tinker
data-tinker / justice / nig
NIG generator (Spain)
The number of a Spanish court case: 19 digits with the seat (INE municipality code), the type of court, the jurisdiction, the year and a sequence number. The validator checks the shape, the province and the year: the table of court types is not public.
Free, no sign-up and no limits. Everything is generated in your browser: nothing is sent anywhere.
What if it filled itself in?
With the Data Tinker extension there is no copying and pasting: it fills the whole form from a panel next to the page, with templates per form and rules for your own fields.
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Test data: valid in format and check digits, but made up. A randomly generated number may match a real person's; do not use them on real systems.