QJsonDocument Class

See also JSON Support in Qt, JSON Save Game Example

This value is used to tell QJsonDocument whether to validate the binary data when converting to a QJsonDocument using fromBinaryData() or fromRawData().

This value defines the format of the JSON byte array produced when converting to a QJsonDocument using toJson().

    {
        "Array": [
            true,
            999,
            "string"
        ],
        "Key": "Value",
        "null": null
    }

    {"Array":[true,999,"string"],"Key":"Value","null":null}

This enum was introduced or modified in Qt 5.1.

Constructs an empty and invalid document.

Creates a QJsonDocument from object.

Constructs a QJsonDocument from array.

Creates a copy of the other document.

Move-constructs a QJsonDocument from other.

This function was introduced in Qt 5.10.

Deletes the document.

Binary data set with fromRawData is not freed.

Returns the QJsonArray contained in the document.

Returns an empty array if the document contains an object.

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Creates a QJsonDocument from data.

validation decides whether the data is checked for validity before being used. By default the data is validated. If the data is not valid, the method returns a null document.

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Parses json as a UTF-8 encoded JSON document, and creates a QJsonDocument from it.

Returns a valid (non-null) QJsonDocument if the parsing succeeds. If it fails, the returned document will be null, and the optional error variable will contain further details about the error.

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Creates a QJsonDocument that uses the first size bytes from data. It assumes data contains a binary encoded JSON document. The created document does not take ownership of data and the caller has to guarantee that data will not be deleted or modified as long as any QJsonDocument, QJsonObject or QJsonArray still references the data.

data has to be aligned to a 4 byte boundary.

validation decides whether the data is checked for validity before being used. By default the data is validated. If the data is not valid, the method returns a null document.

Returns a QJsonDocument representing the data.

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Creates a QJsonDocument from the QVariant variant.

If the variant contains any other type than a QVariantMap, QVariantHash, QVariantList or QStringList, the returned document is invalid.

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Returns true if the document contains an array.

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Returns true if the document doesn't contain any data.

returns true if this document is null.

Null documents are documents created through the default constructor.

Documents created from UTF-8 encoded text or the binary format are validated during parsing. If validation fails, the returned document will also be null.

Returns true if the document contains an object.

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Returns the QJsonObject contained in the document.

Returns an empty object if the document contains an array.

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Returns the raw binary representation of the data size will contain the size of the returned data.

This method is useful to e.g. stream the JSON document in it's binary form to a file.

Sets array as the main object of this document.

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Sets object as the main object of this document.

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Swaps the document other with this. This operation is very fast and never fails.

This function was introduced in Qt 5.10.

Returns a binary representation of the document.

The binary representation is also the native format used internally in Qt, and is very efficient and fast to convert to and from.

The binary format can be stored on disk and interchanged with other applications or computers. fromBinaryData() can be used to convert it back into a JSON document.

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Converts the QJsonDocument to an indented, UTF-8 encoded JSON document.

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Converts the QJsonDocument to a UTF-8 encoded JSON document in the provided format.

This function was introduced in Qt 5.1.

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Returns a QVariant representing the Json document.

The returned variant will be a QVariantList if the document is a QJsonArray and a QVariantMap if the document is a QJsonObject.

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returns true if other is not equal to this document

Assigns the other document to this QJsonDocument. Returns a reference to this object.

Move-assigns other to this document.

This function was introduced in Qt 5.10.

Returns true if the other document is equal to this document.

Returns a QJsonValue representing the value for the key key.

Equivalent to calling object().value(key).

The returned QJsonValue is QJsonValue::Undefined if the key does not exist, or if isObject() is false.

This function was introduced in Qt 5.10.

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This is an overloaded function.

This function was introduced in Qt 5.10.

Returns a QJsonValue representing the value for index i.

Equivalent to calling array().at(i).

The returned QJsonValue is QJsonValue::Undefined, if i is out of bounds, or if isArray() is false.

This function was introduced in Qt 5.10.

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