Delete an item form object and delete "null"

I have this object Geojson, when i do an "delete obj[‘features’][2]" , it left an "null" (look at the end), how can i delete this ? Or there is an another solution ?

{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Point","coordinates":[4.23,48.17]},"properties":{"id":12,"subject":"Sujet essaicatogrie","duration":3,"dateStart":"2020-11-12T00:00:00+00:00","dateEnd":null,"gratis":true,"category":"Sport_walk","media":"5fadd4e225097948791983.jpg"}},{"type":"Feature","geometry":{"type":"Point","coordinates":[-0.71,47.02]},"properties":{"id":13,"subject":"Marche sur les terrils","duration":2,"dateStart":"2020-11-24T00:00:00+00:00","dateEnd":null,"gratis":true,"category":"Sport_walk","media":"5fb3d3d7061b4566505116.jpg"}},null, <------- this {"type":"Featur...

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