Mongodb how to insert ONLY if does not exists (no update if exist)?

You can use $setOnInsert like,

db.companies.updateOne(
   {"company": "test"},
   { $setOnInsert: { "name": "nameVal2", ... } },
   { upsert: true }
)

If this update operation does not do insert, $setOnInsert won’t have any effect. So, the name will be updated only on insert.