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Are there file size limits for file access using JS API, like
http:.../JS/Run/loadObject("filename")
and
http:.../JS/Run/saveObject("filename")
?

What are the limits and what do we get back when limit is exceeded?

Limit is the memory limit of your Pi. You get an exception if it is exceeded. Otherwise there are no limits.

But JSON is a bad format for big files

I tested loadObject with the standard ZWay files. 4 of them return null:
http://IP:8083/JS/Run/loadObject('dedevices.json')
http://IP:8083/JS/Run/loadObject('endevices.json')
http://IP:8083/JS/Run/loadObject('zwayo ... ckets.json')
http://IP:8083/JS/Run/loadObject('zwayp ... ckets.json')

These 4 are the largest files of all:
-rwxr-xr-x 1 4142694 Apr 19 13:49 dedevicesjson-b02fc6609e0022e8f55ff6bb5b853d35.json
-rwxr-xr-x 1 4103417 Apr 19 13:49 endevicesjson-7904daacdb872d656b01c6c9eddd3a48.json
-rwxr-xr-x 1 621220 Aug 11 08:31 zwayoriginPacketsjson-2ad2998bc2cb543d29ac586cec215398.json
-rwxr-xr-x 1 817011 Aug 11 08:31 zwayparsedPacketsjson-f1aed46af7fae1368e78db7768e4d9e5.json

For saveObject there seems to be a buffer size limit of about 6000 bytes. Larger buffers cause an error {"readyState":0,"status":0,"statusText":"error"}.

This should be HTTP limit and not API

Is it a limit of ZWay webserver? Where is it configured?

piet66 wrote: ↑

11 Aug 2019 10:22

I tested loadObject with the standard ZWay files. 4 of them return null

It's not the filesize but the filename. After storing those file with a different valid filename it works.

piet66 wrote: ↑

11 Aug 2019 11:47

Is it a limit of ZWay webserver? Where is it configured?

It's obviously the ZWay embedded webserver. I tested it with netcat.
Apache server also has such a limit: LimitRequestLine 8190

We should use mongoose default values

PoltoS wrote: ↑

14 Aug 2019 04:32

We should use mongoose default values

Of course, but I found it nowhere documented.
Now looked into mongoose code: #define MG_MAX_HTTP_REQUEST_SIZE 8192