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A simple representation for the Spanner JSON type: a lightweight, text-based, language-independent data interchange format.
JSON (the JavaScript Object Notation) defines a small set of formatting rules for the portable representation of structured data. See RFC 7159.
A Json
value can be constructed from, and converted to a std::string
. Json
values can be compared (by string) for equality, and streamed.
There is no syntax checking of JSON strings in this interface. The user is expected to only construct Json
values from well-formatted strings.
Regular value type, supporting copy, assign, move.
Parameter Name Description
Json const &
Regular value type, supporting copy, assign, move.
Parameter Name Description
Json &&
A null value.
Json(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 Descriptions
std::string
Regular value type, supporting copy, assign, move.
Parameter Name Description
Json const &
Json &
operator=(Json &&)
Regular value type, supporting copy, assign, move.
Parameter Name Description
Json &&
Json &
operator std::string() const &
Conversion to a JSON-formatted string.
operator std::string() &&Conversion to a JSON-formatted string.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This webpage provides documentation for the `Json` class in the Google Cloud Spanner C++ library, offering various versions of the class."],["The latest version of the `Json` class is `2.37.0-rc`, with numerous previous versions also documented, starting from version `2.11.0` and going up to `2.36.0`."],["The `Json` class represents a JSON value that can be constructed from and converted to a `std::string`, with no syntax validation happening in this interface and relies on well formatted strings."],["`Json` objects can be created as null values, from JSON formatted strings, and support standard operations such as copying, assignment, moving, equality comparison, and streaming."],["The class supports the conversion to JSON-formatted strings using the `operator std::string()` both for `const` and non-`const` references, allowing easy integration with the standard string type."]]],[]]
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