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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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 details the \u003ccode\u003eJsonB\u003c/code\u003e class, which is a variant of the \u003ccode\u003eJson\u003c/code\u003e class for representing JSON data in a decomposed binary format within the Spanner C++ client library.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e offers faster processing speeds compared to \u003ccode\u003eJson\u003c/code\u003e by avoiding reparsing, making it ideal for applications that rely on the structured state of JSON values.\u003c/p\u003e\n"],["\u003cp\u003eWhile faster to process, \u003ccode\u003eJsonB\u003c/code\u003e is slower to input and does not preserve white space, the order of object keys, or duplicate object keys in its stored representation.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJsonB\u003c/code\u003e class is only applicable to PostgreSQL databases, and the document also contains a list of the versions available for it, ranging from 2.11.0 up to the latest release candidate 2.37.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e supports standard operations like copy, assignment, and move, and can be constructed from a JSON string or converted to a JSON string, with the constructor from a JSON string delaying error detection until passed to Spanner.\u003c/p\u003e\n"]]],[],null,[]]
