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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-26 UTC."],[[["The webpage provides documentation for the `JsonB` class in the Google Cloud Spanner C++ client library, with version-specific links from 2.11.0 up to the latest release candidate 2.37.0-rc."],["`JsonB` is a variant of the `Json` class that stores data in a decomposed, binary format, optimizing for faster processing compared to `Json`, which stores an exact copy of the JSON text."],["Applications that need to frequently access the structured state of JSON data should use `JsonB` due to its faster processing capabilities, but with the trade off of a slower input process."],["`JsonB` does not preserve white space, object key order, or duplicate object keys in its stored representation, unlike `Json`."],["The `JsonB` class is only compatible with PostgreSQL databases in Cloud Spanner and supports constructors for creating null values, moving, and copying, as well as construction from a JSON-formatted string, and it includes operators for assignment and conversion to a JSON-formatted string."]]],[]]
