'0x00' is an invalid start of a value.

[BABAYEGAR]

Description

This occurs when i try to parse very large complex json, using the JsonObject.Parse() from a file stream.

An exception is thrown as seen System.Text.Json.JsonException: '0x00' is an invalid start of a value.

I expect the json to be parsed regardless of the null trailing values

Configuration

.NET 6
Linux
x64
It works perfectly on windows but fails on Linux

Regression?

Not sure it did, a new feature i am working on uses large json so that's where i discovered the error

Other information

Exception: System.Text.Json.JsonException: '0x00' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0. ---> System.Text.Json.JsonReaderException: '0x00' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0. at System.Text.Json.ThrowHelper.ThrowJsonReaderException(Utf8JsonReader& json, ExceptionResource resource, Byte nextByte, ReadOnlySpan`1 bytes) at System.Text.Json.Utf8JsonReader.ConsumeValue(Byte marker) at System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte first) at System.Text.Json.Utf8JsonReader.ReadSingleSegment() at System.Text.Json.Utf8JsonReader.Read() at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack) --- End of inner exception stack trace --- at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& readStack, JsonReaderException ex) at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack) at System.Text.Json.JsonSerializer.ReadCore(Type returnType, JsonSerializerOptions options, Utf8JsonReader& reader) at System.Text.Json.JsonSerializer.Deserialize(String json, Type returnType, JsonSerializerOptions options) at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options) at PowerLauncher.SettingsWatcher.OverloadSettings() at PowerLauncher.SettingsWatcher..ctor(Settings settings) at PowerLauncher.App.<>c__DisplayClass16_0.b1() at Wox.Infrastructure.Stopwatch.Normal(String message, Action action) at PowerLauncher.App.OnStartup(Object sender, StartupEventArgs e) at System.Windows.Application.OnStartup(StartupEventArgs e) at System.Windows.Application.<.ctor>b1_0(Object unused) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Seems like Newtonsoft handles such scenario correctly. But i prefer system.text.json as it is more efficient.

[BABAYEGAR]

OS info: Amazon Linux 2 | x86_64, arm64

[ghost]

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis See info in area-owners.md if you want to be subscribed.

Issue Details

---

### Description `This occurs when i try to parse very large complex json, using the JsonObject.Parse() from a file stream.` ``` An exception is thrown as seen System.Text.Json.JsonException: '0x00' is an invalid start of a value. I expect the json to be parsed regardless of the null trailing values ``` ### Configuration ``` .NET 6 Linux x64 It works perfectly on windows but fails on Linux ``` ### Regression? `Not sure it did, a new feature i am working on uses large json so that's where i discovered the error` ### Other information Exception: System.Text.Json.JsonException: '0x00' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0. ---> System.Text.Json.JsonReaderException: '0x00' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0. at System.Text.Json.ThrowHelper.ThrowJsonReaderException(Utf8JsonReader& json, ExceptionResource resource, Byte nextByte, ReadOnlySpan`1 bytes) at System.Text.Json.Utf8JsonReader.ConsumeValue(Byte marker) at System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte first) at System.Text.Json.Utf8JsonReader.ReadSingleSegment() at System.Text.Json.Utf8JsonReader.Read() at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack) --- End of inner exception stack trace --- at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& readStack, JsonReaderException ex) at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack) at System.Text.Json.JsonSerializer.ReadCore(Type returnType, JsonSerializerOptions options, Utf8JsonReader& reader) at System.Text.Json.JsonSerializer.Deserialize(String json, Type returnType, JsonSerializerOptions options) at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options) at PowerLauncher.SettingsWatcher.OverloadSettings() at PowerLauncher.SettingsWatcher..ctor(Settings settings) at PowerLauncher.App.<>c__DisplayClass16_0.b__1() at Wox.Infrastructure.Stopwatch.Normal(String message, Action action) at PowerLauncher.App.OnStartup(Object sender, StartupEventArgs e) at System.Windows.Application.OnStartup(StartupEventArgs e) at System.Windows.Application.<.ctor>b__1_0(Object unused) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) `Seems like Newtonsoft handles such scenario correctly. But i prefer system.text.json as it is more efficient.`

Author:	BABAYEGAR
Assignees:	-
Labels:	`area-System.Text.Json`, `untriaged`
Milestone:	-

[danmoseley]

Can you share the part of the json that is causing this? Ideally reduce your json file down to just the minimum necessary to still make it fail

[eiriktsarpalis]

This is by-design, but we have an issue tracking potentially tolerating invalid data:

https://github.com/dotnet/runtime/issues/32291

[BABAYEGAR]

Hi @danmoseley Honestly its a very very large JSON for about 3MB worth of data. Its super hard to know where the error is from. The json contains excel spreadsheet data and structure but when i paste the json in a json formatter it says the json structure is valid and the error never appears on a windows machine too

[danmoseley]

No problem, it looks like the team knows the issue, per above.