Question 1

How do I parse a JSON string with qt-json?

Accepted Answer

Use QtJson::parse(jsonString, ok) where ok is a bool reference for error checking. On success, convert the result to a QVariantMap or QVariantList to access data, as shown in the README with examples like iterating over plug-ins or nested indent objects.

Question 2

Is qt-json better than Qt's built-in JSON for Qt4?

Accepted Answer

For Qt4, qt-json is necessary since Qt lacks native JSON support. However, for Qt5 and above, Qt's QJsonDocument is preferred due to better performance, integration, and active development, as noted in the README warning.

Question 3

How can I create a nested JSON object using qt-json builders?

Accepted Answer

Use QtJson::objectBuilder() and arrayBuilder() chainably. For instance, call set() with another builder inside, like in the README where a friends array contains multiple object builders for nested structures, making code more readable.

Question 4

Does qt-json support pretty-printing JSON for debugging?

Accepted Answer

Yes, enable it globally with QtJson::setPrettySerialize(true) before serializing. This outputs formatted JSON with indentation, useful for logs, but be cautious as it affects all serializations until disabled.

Question 5

What happens if qt-json parsing fails?

Accepted Answer

The parse function sets a boolean flag to false on failure, but it doesn't provide detailed error messages or line numbers. You need to handle errors generically, which can be challenging for debugging malformed JSON.

Question 6

Can I use qt-json in a multi-threaded Qt application?

Accepted Answer

The global pretty-print setting (setPrettySerialize) is not thread-safe, as it changes behavior for all threads. For safe usage, avoid dynamic toggling or implement synchronization, though the library doesn't explicitly address threading.

qt-json

What is qt-json?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions