Difference between JSON and JSONB in Postgres [duplicate]

What's difference between JSON and JSONB data type in PosgresSQL?

1. When should be used specific one?
2. What's benefits or disadvantages with respect to other?

Solution 1:

json is basically a blob that stores JSON data in raw format, preserving even insignificant things such as whitespace, the order of keys in objects, or even duplicate keys in objects. It does offer the ability to do some basic JSON operations such as extracting the value associated with some key in an object, albeit it is slow at that since it has to parse the JSON blob every time. It also validates every value to check that it is valid JSON. jsonb on the other hand stores JSON data in a custom format that is optimized for certain operations such as extracting the value associated with some key in an object (i.e. it will not reparse JSON, it will not search linearly). Additionally, jsonb supports more operations, just as concatenation of objects or setting a value deep inside an object.

In general, I use json only if I know that I will not do any JSON operations or only do them occasionally. For all other cases I use jsonb. Note that for the former case, text it is also a perfectly valid option, especially if you are not interested in the validation that json does (e.g. because you trust the source of the data).

Solution 2:

This is explain: https://www.citusdata.com/blog/2016/07/14/choosing-nosql-hstore-json-jsonb/

In most cases JSONB is likely what you want when looking for a NoSQL, schema-less, datatype. Hstore and JSON can have their place as well but it’s less common. More broadly, JSONB isn’t always a fit in every data model. Where you can normalize there are benefits, but if you do have a schema that has a large number of optional columns (such as with event data) or the schema differs based on tenant id then JSONB can be a great fit. In general you want:

JSONB - In most cases
JSON - If you’re just processing logs, don’t often need to query, and use as more of an audit trail
hstore - Can work fine for text based key-value looks, but in general JSONB can still work great here