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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 DescriptionJson const &
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson &&
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 DescriptionJson const &
Json & operator=(Json &&)
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson &&
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."],[[["The latest version of the Spanner JSON class is `2.37.0-rc`, which can be found linked at the top of the version history."],["This documentation provides a reference for the Spanner `Json` class across multiple versions, ranging from `2.37.0-rc` down to `2.11.0`."],["The `Json` class in Spanner is a lightweight, text-based representation for data interchange, adhering to JSON formatting rules."],["`Json` values can be constructed from and converted to `std::string` objects, and they support equality comparisons as well as streaming."],["The Spanner `Json` class does not validate JSON syntax during construction, so users are responsible for providing well-formatted JSON strings."]]],[]]
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