Format JSON

[t0msk]

Hello, I get this JSON from one webservice:

"{
\"response_code\": 1,
\"sha256\": \"c8e61eacbbh31ae51e50a0083e5429bb6bea0f4d822c2793cd58cbf17e3638c1\", 
\"resource\": \"c8e61egcbbd31ae51e50a0093e5429bb6bea0fed822c2794cd58rbf17e3638c1\", 
\"scan_id\": \"c8e61earbd31ae51e50a0093e5429bb6bee0f4d822c2794cd58cbf1fe3638c1e1531522520\"
}"

But if I do:

QJsonDocument document = QJsonDocument::fromJson(reply);
QJsonObject rootObj = document.object();
qDebug() << rootObj.value(QString("scan_id"));

I will get:

QJsonValue(undefined)

So I think it is because that JSON is bad formated (it contains backslashes), is possible to format it into correct form?

[kshegunov]

Did you perchance get that output from qDebug()? If so use qDebug().noquote().

[Mr Gisa]

If the backslash is the only problem, why don't clear the json first using replace('\', '') - QByteArray & QByteArray::replace(const char * before, const char * after)

[Taz742]

@t0msk said in Format JSON:

QJsonDocument document = QJsonDocument::fromJson(reply);

Did you try QJsonDocument document = QJsonDocument::fromBinaryData(reply); ?

[t0msk]

@Mr-Gisa Replacing backslashes of whole reply, can be dangerous because it can corrupt data inside (if message contain backshlash).

@kshegunov Problem is that I cannot get value of node:

qDebug() << rootObj.value(QString("scan_id"));

It says:

QJsonValue(undefined)

@Taz742 Tried and didn't help.

[Mr Gisa]

You are right, but bare in mind that you won't find a method to remove the backslashes for you, you will have to sanitize the input yourself, perhaps you could instead of replacing the \ only, you could replace \" with ".

[mrjj]

@t0msk
You should try with
QJsonDocument::fromBinaryData(reply);
as @Taz742 suggests.
and the \ might NOT be real.
Try outputting with qDebug().noquote() << reply

[t0msk]

@mrjj Yea it removed backslahes, but why this doesn't work?

QJsonDocument document = QJsonDocument::fromBinaryData(reply);
QJsonObject rootObj = document.object();

qDebug().noquote() << rootObj.value(QString("scan_id"));

I still get:

QJsonValue(undefined)

[mrjj]

Hi
The returned QJsonValue is QJsonValue::Undefined if the key does not exist.
so it sounds like it dont have "scan_id" key
Try to dump what rootObj contains and see. what is in there.
also try
https://jsonlint.com/
to see if likes the json.
also reading the docs it seems
QJsonDocument::fromBinaryData expects data to be a blob and i think you have
just a string value so try with
QJsonDocument::fromJson instead. ( or again. sorry)

also check QJsonDocument if it parses correctly.
You have no error checking so it could be anything!
we are flying blind here :)
something like. (there will be dragons. not compiled)
QJsonParseError error;
QJsonDocument document = QJsonDocument::fromJson(reply, &error );
if (document.isNull() {
qDebug() << "Error: " << error.errorString() << error.offset;
}

[Pablo J. Rogina]

@t0msk said in Format JSON:

Hello, I get this JSON from one webservice:

What a network traffic capture shows about data actually received?

[VRonin]

Can you try printing the output of

qDebug() << document.isObject();
qDebug() << rootObj.toVariantMap();