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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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\u003eThis document outlines the \u003ccode\u003eJsonB\u003c/code\u003e class, which is a variant of the \u003ccode\u003eJson\u003c/code\u003e class, used within the Google Cloud Spanner C++ client library.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e stores data in a decomposed, binary format, which makes it faster to process but slower to input compared to \u003ccode\u003eJson\u003c/code\u003e, which stores data in an exact copy of the RFC 7159 text format.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e does not preserve whitespace, the order of object keys, or duplicate object keys in its stored representation.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e is specifically for use with PostgreSQL databases created using \u003ccode\u003eDatabaseDialect::POSTGRESQL\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe document details the constructors and operators for \u003ccode\u003eJsonB\u003c/code\u003e, including how to create a null value, construct from a JSON string, copy, assign and move the object, and convert to a JSON string.\u003c/p\u003e\n"]]],[],null,[]]
