Well, 'John Doe' could be many things. It might be a movie, in which case it could be about a real - life event or person that the filmmakers decided to base the story on. For example, it could be about a crime that a real John Doe committed or was a victim of.
Well, usually when we hear 'John Doe', it's more of a fictional or anonymous reference. But there might be rare cases where it refers to an actual person if it's in a very specific and local context that we don't know about.
There could be a TV series inspired by a real - life John Doe. Maybe a John Doe who was a whistleblower in a big corporate scandal. The series would then be based on his story, showing how he discovered the unethical practices, his decision to come forward, and the consequences he faced.
Since I don't know which 'John Doe' film based on a true story you're looking for, I can't really recommend one. But in general, to find such films, you can search on movie databases using keywords like 'true story' and then look for films that might have a character named John Doe in them. You could also check out documentaries which often tell true stories and might have a subject that could be named John Doe for anonymity purposes.
Since there's not enough information about which 'John Doe real story' is being asked, it's difficult to give a very detailed answer. However, it could also be a story about a John Doe who was involved in a historical event. Maybe he was a witness or a participant in a significant local or even national event, and his actions or experiences during that time are what make up the 'real story'.