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Most JSON field databases treat the JSON field as text and index it as free text. with MongoDB you can index at any level into the document. Since 4.2 you can use wildcard indexes to index a document and any new fields that are subsequently added automatically.

https://docs.mongodb.com/manual/core/index-wildcard/

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The whole point of having a JSON field is so that it has more structured than just text, otherwise you can just use a text field (like SQL Server does). Also they all support various JSON querying and indexing functions that including subfield access with optional computed properties.

Sure MongoDB has some extra ergonomics for dealing with JSON/BSON data, but how much benefit this really adds is still up for debate. As horizontal scalability becomes more natively supported, MongoDB will lose even more of its benefits.

Making JSON the coin of the realm and putting it at the core of your database design and query language is a little bit more than extra ergonomics :-)

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