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Since you will not go through passport control and donβt need a visa, travel insurance is not required by Schengen or national authorities, and nobody will ask for proof they you have insurance (at least not in respect of your transit through Paris).
However it remains a very good idea (to put it lightly) to have travel insurance. Note that you may be covered automatically, especially if you pay for your ticket with a credit card (many include travel insurance), or in other insurance policies. If you donβt, travel insurance is often cheap and quick to get.