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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22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 latest version available is 2.37.0-rc, and the document provides version information for \u003ccode\u003eJsonB\u003c/code\u003e class ranging from 2.11.0 up to the latest release.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e stores data in a decomposed binary format, offering faster processing compared to \u003ccode\u003eJson\u003c/code\u003e, which stores the raw RFC 7159 text.\u003c/p\u003e\n"],["\u003cp\u003eApplications that leverage the structured state of a JSON value should opt for \u003ccode\u003eJsonB\u003c/code\u003e, as it avoids re-parsing and is faster in processing.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJsonB\u003c/code\u003e stored format does not preserve white space, object key order, or duplicate object keys, and is only for PostgreSQL databases.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJsonB\u003c/code\u003e supports several constructors, including null values, copy/move constructors, and construction from a JSON formatted string, and also supports conversion to a JSON formatted string.\u003c/p\u003e\n"]]],[],null,[]]
