PostgreSQL 9.2.3 Documentation
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# 8.14. JSON Type

The `json` data type can be used to store JSON (JavaScript Object Notation) data, as specified in RFC 4627. Such data can also be stored as `text`, but the `json` data type has the advantage of checking that each stored value is a valid JSON value. There are also related support functions available; see Section 9.15.

PostgreSQL allows only one server encoding per database. It is therefore not possible for JSON to conform rigidly to the specification unless the server encoding is UTF-8. Attempts to directly include characters which cannot be represented in the server encoding will fail; conversely, characters which can be represented in the server encoding but not in UTF-8 will be allowed. `\uXXXX` escapes are allowed regardless of the server encoding, and are checked only for syntactic correctness.

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