How to get NaNO2 from NaNO3?

When heated, sodium nitrate decomposes into sodium nitrite and oxygen. The chemical reaction equation is:
2NaNO3 = 2NaNO2 + O2 (gas). This reaction takes place in the temperature range from 380 to 500 degrees Celsius. As a result of the reaction, impurities of Na2O and NO2 are formed. By its type, a chemical reaction belongs to decomposition reactions.

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