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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-26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."],[[["This webpage provides documentation for the `JsonB` class in the Google Cloud Spanner C++ client library, with version 2.37.0-rc being the latest release, and several previous versions are listed, all the way to version 2.11.0."],["`JsonB` is a class similar to `Json`, but it stores data in a binary format for faster processing, while `Json` stores a copy of the JSON text, making `JsonB` more efficient for applications using the structured state of a JSON value."],["The `JsonB` class does not preserve whitespace, the order of object keys, or duplicate object keys, in its stored representation, and should only be used for PostgreSQL databases."],["The `JsonB` class offers constructors for null values, as well as construction from a JSON formatted string, copy, assign and move, and also the conversion to a JSON formatted string."],["There is no check that the string argument used for the construction of JsonB is well-formatted, and any error detection will happen until the value is passed to Spanner."]]],[]]
