Zoom-oauth-sample-app Unexpected token u in JSON at position 0

Description
Sorry for the n00b question.

In trying to follow the zoom-oauth-sample-app instructions, the POST instruction apparently returns an undefined body. Then JSON.parse fails in a way i don’t understand.

Error
Zoom Hello World app listening at PORT: 4000
SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse ()
at Request._callback (/Users/jnw/Zoom/zoom-oauth-sample-app/index.js:33:25)
at self.callback (/Users/jnw/Zoom/zoom-oauth-sample-app/node_modules/request/request.js:185:22)
at Request.emit (events.js:315:20)
at Auth.onRequest (/Users/jnw/Zoom/zoom-oauth-sample-app/node_modules/request/lib/auth.js:132:18)
at Request.auth (/Users/jnw/Zoom/zoom-oauth-sample-app/node_modules/request/request.js:1341:14)
at /Users/jnw/Zoom/zoom-oauth-sample-app/index.js:87:12
at Layer.handle [as handle_request] (/Users/jnw/Zoom/zoom-oauth-sample-app/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/jnw/Zoom/zoom-oauth-sample-app/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/jnw/Zoom/zoom-oauth-sample-app/node_modules/express/lib/router/route.js:112:3)

Which App Type (OAuth / Chatbot / JWT / Webhook)?
OAuth

Which Endpoint/s?
Knowing the API endpoint/s can help us to identify your issue faster. Please link the ones you need help/have a question with.

How To Reproduce (If applicable)
Steps to reproduce the behavior:
Request URL https://zoom.us/oauth/authorize?response_type=code&client_id=gGdMwt7YRuODi12dDLRAQ&redirect_uri=http%3A%2F%2F30f46877.ngrok.io

Screenshots (If applicable)
No fun screenshots. The error message tells it all

Additional context
No add’l context

Hey @jnw,

Can you try logging the req from this line?

Thanks,
Tommy

Thanks! Sure. Here it is (with the code slightly obscured).
I’m about to look at it to see if I find anything odd, but I doubt I’d know.

req is:/ <ref *2> IncomingMessage {
_readableState: ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes: ,
flowing: null,
ended: false,
endEmitted: false,
reading: false,
sync: true,
needReadable: false,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
errorEmitted: false,
emitClose: true,
autoDestroy: false,
destroyed: false,
defaultEncoding: ‘utf8’,
awaitDrainWriters: null,
multiAwaitDrain: false,
readingMore: true,
decoder: null,
encoding: null,
[Symbol(kPaused)]: null
},
readable: true,
_events: [Object: null prototype] {
end: [Function: resetHeadersTimeoutOnReqEnd]
},
_eventsCount: 1,
_maxListeners: undefined,
socket: <ref *1> Socket {
connecting: false,
_hadError: false,
_parent: null,
_host: null,
_readableState: ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes: ,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
errorEmitted: false,
emitClose: false,
autoDestroy: false,
destroyed: false,
defaultEncoding: ‘utf8’,
awaitDrainWriters: null,
multiAwaitDrain: false,
readingMore: false,
decoder: null,
encoding: null,
[Symbol(kPaused)]: false
},
readable: true,
_events: [Object: null prototype] {
end: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
error: [Function: socketOnError],
close: [Array],
drain: [Function: bound socketOnDrain],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause]
},
_eventsCount: 8,
_maxListeners: undefined,
_writableState: WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: ‘utf8’,
length: 0,
writing: false,
corked: 0,
sync: true,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
afterWriteTickInfo: null,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 0,
prefinished: false,
errorEmitted: false,
emitClose: false,
autoDestroy: false,
errored: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object]
},
writable: true,
allowHalfOpen: true,
_sockname: null,
_pendingData: null,
_pendingEncoding: ‘’,
server: Server {
maxHeaderSize: undefined,
insecureHTTPParser: undefined,
_events: [Object: null prototype],
_eventsCount: 2,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: ,
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 0,
keepAliveTimeout: 5000,
maxHeadersCount: null,
headersTimeout: 60000,
_connectionKey: ‘6::::4000’,
[Symbol(IncomingMessage)]: [Function: IncomingMessage],
[Symbol(ServerResponse)]: [Function: ServerResponse],
[Symbol(kCapture)]: false,
[Symbol(asyncId)]: 5
},
_server: Server {
maxHeaderSize: undefined,
insecureHTTPParser: undefined,
_events: [Object: null prototype],
_eventsCount: 2,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: ,
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 0,
keepAliveTimeout: 5000,
maxHeadersCount: null,
headersTimeout: 60000,
_connectionKey: ‘6::::4000’,
[Symbol(IncomingMessage)]: [Function: IncomingMessage],
[Symbol(ServerResponse)]: [Function: ServerResponse],
[Symbol(kCapture)]: false,
[Symbol(asyncId)]: 5
},
parser: HTTPParser {
‘0’: [Function: parserOnHeaders],
‘1’: [Function: parserOnHeadersComplete],
‘2’: [Function: parserOnBody],
‘3’: [Function: parserOnMessageComplete],
‘4’: [Function: bound onParserExecute],
_headers: ,
_url: ‘’,
socket: [Circular *1],
incoming: [Circular 2],
outgoing: null,
maxHeaderPairs: 2000,
_consumed: true,
onIncoming: [Function: bound parserOnIncoming],
parsingHeadersStart: 0
},
on: [Function: socketListenerWrap],
addListener: [Function: socketListenerWrap],
prependListener: [Function: socketListenerWrap],
_paused: false,
_httpMessage: ServerResponse {
_events: [Object: null prototype],
_eventsCount: 1,
_maxListeners: undefined,
outputData: [],
outputSize: 0,
writable: true,
_last: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: ‘’,
finished: false,
_headerSent: false,
socket: [Circular 1],
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular 2],
locals: [Object: null prototype] {},
[Symbol(kCapture)]: false,
[Symbol(kNeedDrain)]: false,
[Symbol(corked)]: 0,
[Symbol(kOutHeaders)]: [Object: null prototype]
},
[Symbol(asyncId)]: 9,
[Symbol(kHandle)]: TCP {
reading: true,
onconnection: null,
_consumed: true,
[Symbol(owner)]: [Circular 1]
},
[Symbol(kSetNoDelay)]: false,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(timeout)]: null,
[Symbol(kBuffer)]: null,
[Symbol(kBufferCb)]: null,
[Symbol(kBufferGen)]: null,
[Symbol(kCapture)]: false,
[Symbol(kBytesRead)]: 0,
[Symbol(kBytesWritten)]: 0
},
httpVersionMajor: 1,
httpVersionMinor: 1,
httpVersion: ‘1.1’,
complete: false,
headers: {
host: ‘30f46877.ngrok.io’,
‘upgrade-insecure-requests’: ‘1’,
‘user-agent’: ‘Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36’,
accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,
/
;q=0.8,application/signed-exchange;v=b3;q=0.9’,
‘accept-encoding’: ‘gzip, deflate’,
‘accept-language’: ‘en-US,en;q=0.9’,
‘x-forwarded-for’: ‘24.136.51.226’
},
rawHeaders: [
‘Host’,
30f46877.ngrok.io’,
‘Upgrade-Insecure-Requests’,
‘1’,
‘User-Agent’,
‘Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36’,
‘Accept’,
'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,
/
;q=0.8,application/signed-exchange;v=b3;q=0.9’,
‘Accept-Encoding’,
‘gzip, deflate’,
‘Accept-Language’,
‘en-US,en;q=0.9’,
‘X-Forwarded-For’,
‘24.136.51.226’
],
trailers: {},
rawTrailers: ,
aborted: false,
upgrade: false,
url: ‘/?code=HB…SA’, // elided for OpSec
method: ‘GET’,
statusCode: null,
statusMessage: null,
client: <ref *1> Socket {
connecting: false,
_hadError: false,
_parent: null,
_host: null,
_readableState: ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes: ,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
errorEmitted: false,
emitClose: false,
autoDestroy: false,
destroyed: false,
defaultEncoding: ‘utf8’,
awaitDrainWriters: null,
multiAwaitDrain: false,
readingMore: false,
decoder: null,
encoding: null,
[Symbol(kPaused)]: false
},
readable: true,
_events: [Object: null prototype] {
end: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
error: [Function: socketOnError],
close: [Array],
drain: [Function: bound socketOnDrain],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause]
},
_eventsCount: 8,
_maxListeners: undefined,
_writableState: WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: ‘utf8’,
length: 0,
writing: false,
corked: 0,
sync: true,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
afterWriteTickInfo: null,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 0,
prefinished: false,
errorEmitted: false,
emitClose: false,
autoDestroy: false,
errored: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object]
},
writable: true,
allowHalfOpen: true,
_sockname: null,
_pendingData: null,
_pendingEncoding: ‘’,
server: Server {
maxHeaderSize: undefined,
insecureHTTPParser: undefined,
_events: [Object: null prototype],
_eventsCount: 2,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: ,
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 0,
keepAliveTimeout: 5000,
maxHeadersCount: null,
headersTimeout: 60000,
_connectionKey: ‘6::::4000’,
[Symbol(IncomingMessage)]: [Function: IncomingMessage],
[Symbol(ServerResponse)]: [Function: ServerResponse],
[Symbol(kCapture)]: false,
[Symbol(asyncId)]: 5
},
_server: Server {
maxHeaderSize: undefined,
insecureHTTPParser: undefined,
_events: [Object: null prototype],
_eventsCount: 2,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: ,
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 0,
keepAliveTimeout: 5000,
maxHeadersCount: null,
headersTimeout: 60000,
_connectionKey: ‘6::::4000’,
[Symbol(IncomingMessage)]: [Function: IncomingMessage],
[Symbol(ServerResponse)]: [Function: ServerResponse],
[Symbol(kCapture)]: false,
[Symbol(asyncId)]: 5
},
parser: HTTPParser {
‘0’: [Function: parserOnHeaders],
‘1’: [Function: parserOnHeadersComplete],
‘2’: [Function: parserOnBody],
‘3’: [Function: parserOnMessageComplete],
‘4’: [Function: bound onParserExecute],
_headers: ,
_url: ‘’,
socket: [Circular *1],
incoming: [Circular *2],
outgoing: null,
maxHeaderPairs: 2000,
_consumed: true,
onIncoming: [Function: bound parserOnIncoming],
parsingHeadersStart: 0
},
on: [Function: socketListenerWrap],
addListener: [Function: socketListenerWrap],
prependListener: [Function: socketListenerWrap],
_paused: false,
_httpMessage: ServerResponse {
_events: [Object: null prototype],
_eventsCount: 1,
_maxListeners: undefined,
outputData: ,
outputSize: 0,
writable: true,
_last: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: ‘’,
finished: false,
_headerSent: false,
socket: [Circular *1],
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular *2],
locals: [Object: null prototype] {},
[Symbol(kCapture)]: false,
[Symbol(kNeedDrain)]: false,
[Symbol(corked)]: 0,
[Symbol(kOutHeaders)]: [Object: null prototype]
},
[Symbol(asyncId)]: 9,
[Symbol(kHandle)]: TCP {
reading: true,
onconnection: null,
_consumed: true,
[Symbol(owner)]: [Circular *1]
},
[Symbol(kSetNoDelay)]: false,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(timeout)]: null,
[Symbol(kBuffer)]: null,
[Symbol(kBufferCb)]: null,
[Symbol(kBufferGen)]: null,
[Symbol(kCapture)]: false,
[Symbol(kBytesRead)]: 0,
[Symbol(kBytesWritten)]: 0
},
_consuming: false,
_dumped: false,
next: [Function: next],
baseUrl: ‘’,
originalUrl: ‘/?code=HB…SA’, // elided for OpSec
_parsedUrl: Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: ‘?code=HB…SA’, // elided for OpSec
query: ‘code=HB…SA’, // elided for OpSec
pathname: ‘/’,
path: ‘/?code=HB…SA’, // elided for OpSec
href: ‘/?code=HB…SA’, // elided for OpSec
_raw: ‘/?code=HB…SA’ // elided for OpSec
},
params: {},
query: { code: ‘HB…SA’ }, // elided for OpSec
res: <ref *3> ServerResponse {
_events: [Object: null prototype] { finish: [Function: bound resOnFinish] },
_eventsCount: 1,
_maxListeners: undefined,
outputData: ,
outputSize: 0,
writable: true,
_last: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: ‘’,
finished: false,
_headerSent: false,
socket: <ref *1> Socket {
connecting: false,
_hadError: false,
_parent: null,
_host: null,
_readableState: [ReadableState],
readable: true,
_events: [Object: null prototype],
_eventsCount: 8,
_maxListeners: undefined,
_writableState: [WritableState],
writable: true,
allowHalfOpen: true,
_sockname: null,
_pendingData: null,
_pendingEncoding: ‘’,
server: [Server],
_server: [Server],
parser: [HTTPParser],
on: [Function: socketListenerWrap],
addListener: [Function: socketListenerWrap],
prependListener: [Function: socketListenerWrap],
_paused: false,
_httpMessage: [Circular *3],
[Symbol(asyncId)]: 9,
[Symbol(kHandle)]: [TCP],
[Symbol(kSetNoDelay)]: false,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(timeout)]: null,
[Symbol(kBuffer)]: null,
[Symbol(kBufferCb)]: null,
[Symbol(kBufferGen)]: null,
[Symbol(kCapture)]: false,
[Symbol(kBytesRead)]: 0,
[Symbol(kBytesWritten)]: 0
},
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular *2],
locals: [Object: null prototype] {},
[Symbol(kCapture)]: false,
[Symbol(kNeedDrain)]: false,
[Symbol(corked)]: 0,
[Symbol(kOutHeaders)]: [Object: null prototype] { ‘x-powered-by’: [Array] }
},
route: Route { path: ‘/’, stack: [ [Layer] ], methods: { get: true } },
[Symbol(kCapture)]: false
}

BTW, the URL 30f46877.ngrok.io is no longer active.
I’ve shut down that forward.

Found this error was a result of type in .env file.
Thanks.

1 Like

Happy to hear you figured out the issue! :slight_smile:

Thanks,
Tommy

In my case, I didn’t have a typo but I didn’t add the “Redirect URL for OAuth” to the whitelist URL in the App Credentials page

1 Like

@tommy
I tried using my access token in the zoom api test page to change my password (I am a single user account)

However, when I tried to send the PUT message, I got this error:

{
  "code": 1117,
  "message": "Can not update Admin's password"
}

Can you please explain why this happening? How is this API supposed to work if I can’t change my password?

Hey @frakman,

What are you passing in for the {userID} param?

Also, are you using a user or account level OAuth app?

Thanks,
Tommy

Thank you for writing back @tommy.

I am using my email as the {userID}
I am using the account level app.
image

Hey @frakman,

Can you please private message me your email and request body so I can investigate further?

Also due note the enhanced password rules settings:

Thanks,
Tommy

I am getting the same error. There is no typo in my .env file and I have my url redirect in both spots.

SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse ()
at Request._callback (C:\Users\GalloPad\zoom-oauth-sample-app\index.js:29:25)
at self.callback (C:\Users\GalloPad\zoom-oauth-sample-app\node_modules\request\request.js:185:22)
at Request.emit (events.js:210:5)
at Auth.onRequest (C:\Users\GalloPad\zoom-oauth-sample-app\node_modules\request\lib\auth.js:132:18)
at Request.auth (C:\Users\GalloPad\zoom-oauth-sample-app\node_modules\request\request.js:1341:14)
at C:\Users\GalloPad\zoom-oauth-sample-app\index.js:82:12
at Layer.handle [as handle_request] (C:\Users\GalloPad\zoom-oauth-sample-app\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\GalloPad\zoom-oauth-sample-app\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (C:\Users\GalloPad\zoom-oauth-sample-app\node_modules\express\lib\router\route.js:112:3)

Hey @georgiareporting,

Can you console.log the body on this line:

Let me know what is returned so I can help debug.

Thanks,
Tommy

This is my first time doing this. I ‘believe’ I’m doing it correctly. My ngrok forwarding is the same as what’s in my .env file and on redirect.

This error code runs when I console.log body.

{“reason”:“Invalid request : Redirect URI mismatch.”,“error”:“invalid_request”}
access_token: undefined
refresh_token: undefined

1 Like

Now it is working for some reason. It didn’t work the first 50 times and it started to work after I posted the last error. I have no idea. I didn’t change anything.

1 Like

Hey @georgiareporting,

Glad you got it working! The redirect_URI was probably not set in your App Marketplace Settings or in the .env file.

Thanks,
Tommy