Unexpected token L in JSON at position 0

[WasserEsser]

Actual Behavior

1. Debugging doesn't work

Expected Behavior

1. Debugging works

Software versions

• React-Native VS Code extension version: 0.6.13
• VSCode version: 1.26.1
• OS platform and version: Windows 10 (17134)
• NodeJS version: 8.9.3
• React Native version: 0.55.4 (cli: 2.0.1)

Outputs (Include if relevant)

• Output of the Debug Console (View -> Toggle Debug Console):

OS: win32 x64
Adapter node: v8.9.3 x64
vscode-chrome-debug-core: 3.17.3
2:20:24 PM, 8/24/2018
From client: initialize({"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"reactnative","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en-gb"})
To client: {"seq":0,"type":"response","request_seq":1,"command":"initialize","success":true,"body":{"exceptionBreakpointFilters":[{"label":"All Exceptions","filter":"all","default":false},{"label":"Uncaught Exceptions","filter":"uncaught","default":false}],"supportsConfigurationDoneRequest":true,"supportsSetVariable":true,"supportsConditionalBreakpoints":true,"supportsCompletionsRequest":true,"supportsHitConditionalBreakpoints":true,"supportsRestartFrame":true,"supportsExceptionInfoRequest":true,"supportsDelayedStackTraceLoading":true,"supportsValueFormattingOptions":true,"supportsEvaluateForHovers":true,"supportsLogPoints":true,"supportsTerminateRequest":false}}
Starting debugger app worker.
About to download: http://localhost:8081/debugger-ui/debuggerWorker.js to: C:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball\.vscode\.react\debuggerWorker.js
Established a connection with the Proxy (Packager) to the React Native application
From RN APP: {"method":"$disconnected"}
From RN APP: {"id":0,"method":"prepareJSRuntime"}
A new app worker lifetime was created.
Spawned debuggee process with pid 9948 listening to 7409
Debugger worker loaded runtime on port 7409
To client: {"seq":0,"type":"event","event":"output","body":{"category":"telemetry","output":"debugStarted","data":{"request":"attach","args":["name","program","type","request","platform","sourceMaps","outDir","trace","__sessionId","port","address","restart","remoteRoot","localRoot","sourceMapPathOverrides","showAsyncStacks"]}}}
To RN APP: {"replyID":0}
From RN APP: {"id":1,"method":"executeApplicationScript","url":"http://localhost:8081/index.bundle?platform=android&dev=true&minify=false","inject":{"__fbBatchedBridgeConfig":"{\"remoteModuleConfig\":[[\"StatusBarManager\",{\"HEIGHT\":30.4761905670166},[\"setColor\",\"setHidden\",\"setStyle\",\"setTranslucent\"]],[\"DeviceEventManager\",{},[\"invokeDefaultBackPressHandler\"]],[\"JSCSamplingProfiler\",{},[\"operationComplete\"]],[\"ImageEditingManager\",{},[\"cropImage\"]],[\"NativeAnimatedModule\",{},[\"addAnimatedEventToView\",\"connectAnimatedNodeToView\",\"connectAnimatedNodes\",\"createAnimatedNode\",\"disconnectAnimatedNodeFromView\",\"disconnectAnimatedNodes\",\"dropAnimatedNode\",\"extractAnimatedNodeOffset\",\"flattenAnimatedNodeOffset\",\"removeAnimatedEventFromView\",\"setAnimatedNodeOffset\",\"setAnimatedNodeValue\",\"startAnimatingNode\",\"startListeningToAnimatedNodeValue\",\"stopAnimation\",\"stopListeningToAnimatedNodeValue\"]],[\"AsyncSQLiteDBStorage\",{},[\"clear\",\"getAllKeys\",\"multiGet\",\"multiMerge\",\"multiRemove\",\"multiSet\"]],[\"LocationObserver\",{},[\"getCurrentPosition\",\"startObserving\",\"stopObserving\"]],[\"NetInfo\",{},[\"getCurrentConnectivity\",\"isConnectionMetered\"],[0,1]],[\"ShareModule\",{},[\"share\"],[0]],[\"JSDevSupport\",{},[\"setResult\"]],[\"DatePickerAndroid\",{},[\"open\"],[0]],[\"Vibration\",{},[\"cancel\",\"vibrate\",\"vibrateByPattern\"]],[\"CameraRollManager\",{},[\"getPhotos\",\"saveToCameraRoll\"],[0,1]],[\"PlatformCo[...]
To client: {"seq":0,"type":"event","event":"output","body":{"category":"telemetry","output":"targetDebugProtocolVersion","data":{}}}
To client: {"seq":0,"type":"event","event":"output","body":{"category":"telemetry","output":"targetCount","data":{"numTargets":1}}}
To client: {"seq":0,"type":"event","event":"capabilities","body":{"capabilities":{"supportsStepBack":false}}}
To client: {"seq":0,"type":"response","request_seq":2,"command":"launch","success":true}
To client: {"seq":0,"type":"event","event":"output","body":{"category":"telemetry","output":"nodeVersion","data":{"version":"v10.7.0"}}}
To client: {"seq":0,"type":"event","event":"initialized"}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"loaders.js","path":"<node_internals>/internal/bootstrap/loaders.js","sourceReference":1000,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"node.js","path":"<node_internals>/internal/bootstrap/node.js","sourceReference":1001,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"VM15","path":"<eval>/VM15","sourceReference":1002,"origin":"read-only content from Node.js"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"events.js","path":"<node_internals>/events.js","sourceReference":1003,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"async_hooks.js","path":"<node_internals>/internal/async_hooks.js","sourceReference":1004,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"errors.js","path":"<node_internals>/internal/errors.js","sourceReference":1005,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"util.js","path":"<node_internals>/util.js","sourceReference":1006,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"encoding.js","path":"<node_internals>/internal/encoding.js","sourceReference":1007,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"util.js","path":"<node_internals>/internal/util.js","sourceReference":1008,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"types.js","path":"<node_internals>/internal/util/types.js","sourceReference":1009,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"buffer.js","path":"<node_internals>/buffer.js","sourceReference":1010,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"buffer.js","path":"<node_internals>/internal/buffer.js","sourceReference":1011,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"per_thread.js","path":"<node_internals>/internal/process/per_thread.js","sourceReference":1012,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"main_thread_only.js","path":"<node_internals>/internal/process/main_thread_only.js","sourceReference":1013,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"stdio.js","path":"<node_internals>/internal/process/stdio.js","sourceReference":1014,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"assert.js","path":"<node_internals>/assert.js","sourceReference":1015,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"assert.js","path":"<node_internals>/internal/assert.js","sourceReference":1016,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"fs.js","path":"<node_internals>/fs.js","sourceReference":1017,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"path.js","path":"<node_internals>/path.js","sourceReference":1018,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"constants.js","path":"<node_internals>/internal/constants.js","sourceReference":1019,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"utils.js","path":"<node_internals>/internal/fs/utils.js","sourceReference":1020,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"url.js","path":"<node_internals>/internal/url.js","sourceReference":1021,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"querystring.js","path":"<node_internals>/internal/querystring.js","sourceReference":1022,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"validators.js","path":"<node_internals>/internal/validators.js","sourceReference":1023,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"warning.js","path":"<node_internals>/internal/process/warning.js","sourceReference":1024,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"next_tick.js","path":"<node_internals>/internal/process/next_tick.js","sourceReference":1025,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"promises.js","path":"<node_internals>/internal/process/promises.js","sourceReference":1026,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"fixed_queue.js","path":"<node_internals>/internal/fixed_queue.js","sourceReference":1027,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"inspector_async_hook.js","path":"<node_internals>/internal/inspector_async_hook.js","sourceReference":1028,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"async_hooks.js","path":"<node_internals>/async_hooks.js","sourceReference":1029,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"child_process.js","path":"<node_internals>/child_process.js","sourceReference":1030,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"child_process.js","path":"<node_internals>/internal/child_process.js","sourceReference":1031,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"net.js","path":"<node_internals>/net.js","sourceReference":1032,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"stream.js","path":"<node_internals>/stream.js","sourceReference":1033,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"pipeline.js","path":"<node_internals>/internal/streams/pipeline.js","sourceReference":1034,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"end-of-stream.js","path":"<node_internals>/internal/streams/end-of-stream.js","sourceReference":1035,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"legacy.js","path":"<node_internals>/internal/streams/legacy.js","sourceReference":1036,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_stream_readable.js","path":"<node_internals>/_stream_readable.js","sourceReference":1037,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"buffer_list.js","path":"<node_internals>/internal/streams/buffer_list.js","sourceReference":1038,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"destroy.js","path":"<node_internals>/internal/streams/destroy.js","sourceReference":1039,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"state.js","path":"<node_internals>/internal/streams/state.js","sourceReference":1040,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_stream_writable.js","path":"<node_internals>/_stream_writable.js","sourceReference":1041,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_stream_duplex.js","path":"<node_internals>/_stream_duplex.js","sourceReference":1042,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_stream_transform.js","path":"<node_internals>/_stream_transform.js","sourceReference":1043,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_stream_passthrough.js","path":"<node_internals>/_stream_passthrough.js","sourceReference":1044,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"net.js","path":"<node_internals>/internal/net.js","sourceReference":1045,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"stream_base_commons.js","path":"<node_internals>/internal/stream_base_commons.js","sourceReference":1046,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"timers.js","path":"<node_internals>/internal/timers.js","sourceReference":1047,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"dgram.js","path":"<node_internals>/dgram.js","sourceReference":1048,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"socket_list.js","path":"<node_internals>/internal/socket_list.js","sourceReference":1049,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_http_common.js","path":"<node_internals>/_http_common.js","sourceReference":1050,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"freelist.js","path":"<node_internals>/internal/freelist.js","sourceReference":1051,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"http.js","path":"<node_internals>/internal/http.js","sourceReference":1052,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"_http_incoming.js","path":"<node_internals>/_http_incoming.js","sourceReference":1053,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"string_decoder.js","path":"<node_internals>/string_decoder.js","sourceReference":1054,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"timers.js","path":"<node_internals>/timers.js","sourceReference":1055,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"linkedlist.js","path":"<node_internals>/internal/linkedlist.js","sourceReference":1056,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"loader.js","path":"<node_internals>/internal/modules/cjs/loader.js","sourceReference":1057,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"vm.js","path":"<node_internals>/vm.js","sourceReference":1058,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"helpers.js","path":"<node_internals>/internal/modules/cjs/helpers.js","sourceReference":1059,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"console.js","path":"<node_internals>/console.js","sourceReference":1060,"origin":"read-only core module"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"VM75","path":"<eval>/VM75","sourceReference":1062,"origin":"read-only content from Node.js"}}}
To client: {"seq":0,"type":"event","event":"loadedSource","body":{"reason":"new","source":{"name":"debuggerWorker.js","path":"c:\\Users\\Marcel Kirchhoff\\Documents\\TuS_Derschlag_Handball\\.vscode\\.react\\debuggerWorker.js","origin":"read-only content from Node.js"}}}
From client: setExceptionBreakpoints({"filters":[]})
To client: {"seq":0,"type":"response","request_seq":3,"command":"setExceptionBreakpoints","success":true}
From client: configurationDone(undefined)
From client: threads(undefined)
To client: {"seq":0,"type":"response","request_seq":5,"command":"threads","success":true,"body":{"threads":[{"id":1,"name":"Node (9948)"}]}}
To client: {"seq":0,"type":"response","request_seq":4,"command":"configurationDone","success":true}
******** Unhandled error in debug adapter: SyntaxError: Unexpected token L in JSON at position 0
    at JSON.parse (<anonymous>)
    at Pipe.channel.onread (internal/child_process.js:470:28)

• Output of the React-Native output channel (View -> Toggle Output -> Select React-Native in ListBox):

[Info] Starting Packager

Scanning folders for symlinks in c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball\node_modules (41ms)
┌──────────────────────────────────────────────────────────────────────────────┐
│                                                                              │
│  Running Metro Bundler on port 8081.                                         │
│                                                                              │
│  Keep Metro running while developing on any JS projects. Feel free to        │
│  close this tab and run your own Metro instance if you prefer.               │
│                                                                              │
│  https://github.com/facebook/react-native                                    │
│                                                                              │
└──────────────────────────────────────────────────────────────────────────────┘

Looking for JS files in
   c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball
   c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball\.vscode 


Metro Bundler ready.

[Info] Packager started.

[Info] Prewarming bundle cache. This may take a while ...

[Info] About to get: http://localhost:8081/index.bundle?platform=android

Loading dependency graph, done.
[Warning] The Bundle Cache was prewarmed.

[Info] Building and running application.

 BUNDLE  [android, dev] ./index.js ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓ 100.0% (482/482), done.

[Info] Enable JS Debugging

Starting custom debugger by executing: echo A debugger is not needed:  "c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball" "c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball\.vscode"
Starting custom debugger by executing: echo A debugger is not needed:  "c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball" "c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball\.vscode"
Starting custom debugger by executing: echo A debugger is not needed:  "c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball" "c:\Users\Marcel Kirchhoff\Documents\TuS_Derschlag_Handball\.vscode"

• Output of the Developer Tools console (Help -> Toggle Developer Tools -> Select Console tab):

Debug adapter process has terminated unexpectedly
t.onDidNotificationChange @ notificationsAlerts.ts:41
(anonymous) @ notificationsAlerts.ts:27
e.fire @ event.ts:140
t.notify @ notifications.ts:113
t.error @ notificationService.ts:52
t.onDebugAdapterExit @ rawDebugSession.ts:524
(anonymous) @ rawDebugSession.ts:167
e.fire @ event.ts:140
(anonymous) @ debugAdapter.ts:304
emitTwo @ events.js:131
emit @ events.js:214
__dirname.ChildProcess._handle.onexit @ internal/child_process.js:198

Neither debugging via Debug Android nor Run on Android, attach to packager and hitting debug js remotely work. I keep getting the same json parse error. I have reinstalled the extension several times, even weeks ago. I simply can't seem to debug my react native applications.

[ruslan-bikkinin]

Hi @WasserEsser and thanks for submitting the issue. This issue has been resolved in v0.6.14. However we already have similar one #758, so I am going to close it for now. Please feel free to leave feedback there if problem still persists.

[reza7rm]

I still encounter this issue on react native 0.57.1 and react native tools version:0.6.18 on windows 10. I donno why old issues reappear in new versions. It's really frustrating...

[ruslan-bikkinin]

hi @reza7rm, please see #777 (comment)