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Showing content from https://cloud.google.com/cpp/docs/reference/spanner/2.13.0/classgoogle_1_1cloud_1_1spanner_1_1Json below:

Class Json (2.13.0) | C++ Client Libraries

Skip to main content Class Json (2.13.0)

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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.

Constructors Json(Json const &)

Regular value type, supporting copy, assign, move.

Parameter Name Description Json const &
Json(Json &&)

Regular value type, supporting copy, assign, move.

Parameter Name Description Json &&
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 Description s std::string
Operators operator=(Json const &)

Regular value type, supporting copy, assign, move.

Parameter Name Description Json const &
Returns Type Description Json & operator=(Json &&)

Regular value type, supporting copy, assign, move.

Parameter Name Description Json &&
Returns Type Description 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 document details the `Json` class within the Spanner C++ library, providing a representation for JSON data."],["The latest version of the Spanner C++ library is `2.37.0-rc`, with multiple prior versions available for reference."],["`Json` objects can be created from JSON-formatted strings and converted back to strings, without any immediate syntax checking, but error detection will happen when the value is passed to Spanner."],["The `Json` class supports standard copy, assignment, and move operations, along with equality comparison by string value."],["The `Json` class can also be constructed as a null value, and has methods to be converted into a formatted JSON string."]]],[]]

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