While both classes share the same, thin client-side API, JsonB stores the data in a decomposed, binary format, whereas Json stores an exact copy of the RFC 7159 text.
This means that JsonB is slower to input, but faster to process as it avoids reparsing. Therefore, applications that utilize the structured state of a JSON value should prefer JsonB.
It also means that the JsonB stored representation does NOT preserve:
white space,
the order of object keys, or
duplicate object keys.
Note: JsonB is only applicable to PostgreSQL databases (i.e., those created using DatabaseDialect::POSTGRESQL).
Constructors
JsonB(JsonB const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
JsonB const &
JsonB(JsonB &&)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
JsonB &&
JsonB()
A null value.
JsonB(std::string)
Construction from a JSON-formatted string.
Note that there is no check here that the argument string is indeed well-formatted. Error detection will be delayed until the value is passed to Spanner.
Parameter
Name
Description
s
std::string
Operators
operator=(JsonB const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
JsonB const &
Returns
Type
Description
JsonB &
operator=(JsonB &&)
Regular value type, supporting copy, assign, move.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22 UTC."],[[["\u003cp\u003eThe webpage provides documentation for the \u003ccode\u003eJsonB\u003c/code\u003e class in various versions, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e is a variant of the \u003ccode\u003eJson\u003c/code\u003e class, specifically designed for PostgreSQL databases, that stores data in a decomposed, binary format for faster processing.\u003c/p\u003e\n"],["\u003cp\u003eUnlike \u003ccode\u003eJson\u003c/code\u003e, \u003ccode\u003eJsonB\u003c/code\u003e does not preserve white space, object key order, or duplicate object keys, and is slower to input due to its format.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e supports standard operations such as copy, assignment, move, and can be constructed from a JSON-formatted string or as a null value, but will delay error detection until the value is passed to Spanner.\u003c/p\u003e\n"],["\u003cp\u003eThe class provides methods for conversion to a JSON-formatted string through the use of casting operators.\u003c/p\u003e\n"]]],[],null,[]]
