JSON Decoder ESP32

[Xbiotec]

hi,
I'm trying to decode JSON string using JSON DECODER.
1- when I'm trying to decode this string

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{"power":500,"frequency":20000,"total_energy":"0.001000","duration":60}

First I checked how many data in the string and result is : 4

data 0 power 500
data 1 frequency 20000
data 2 total_energy 0
data 3 duration 60
No problem, I can get all the name and data

2- when I'm trying to decode this string

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{
	"usb_ports":	[{
			"USB_1":	{
				"power":	500,
				"duration":	5,
				"frequency":	20000,
				"total_energy":	"0.000",
				"ischeck":	true
			}
		}, {
			"USB_2":	{
				"power":	0,
				"duration":	0,
				"frequency":	0,
				"total_energy":	"0.000",
				"ischeck":	true
			}
		}, {
			"USB_3":	{
				"power":	0,
				"duration":	0,
				"frequency":	0,
				"total_energy":	"0.000",
				"ischeck":	true
			}
		}, {
			"USB_4":	{
				"power":	0,
				"duration":	0,
				"frequency":	0,
				"total_energy":	"0.000",
				"ischeck":	true
			}
		}]
}

First I checked how many data in the string and result is : 25
data 0 usb_ports 1
data 1 duration 5
data 2 frequency 20000
data 3 total_energy 0
data 4 ischeck 0
data 5 USB_2 0
data 6 duration 0
data 7 frequency 0
data 8 total_energy 0
data 9 ischeck 0
data 10 USB_3 0
data 11 duration 0
data 12 frequency 0
data 13 total_energy 0
data 14 ischeck 0
data 15 USB_4 0
data 16 duration 0
data 17 frequency 0
data 18 total_energy 0
data 19 ischeck 0
data 20 0
data 21 0
data 22 0
data 23 0
data 24 0

Problem, USB_1 and the 4 power data are missing
May because the decoder is not able to decode an array ?
or other ?
when I check if "power" name is present, the result 65535

Thx for your prompt reply

[Xbiotec]

I forgot to tell you but I checked the Json with Json Parser Online and the frame is good.
So I think it's a decoder component problem

Json parser online.jpg (65.93 KiB) Viewed 16940 times

[Xbiotec]

same problem with this JSON frame

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{"modes":{"fastmode":{"completed":true}}}

DataCount 3
data 0 modes 0
data 1 0
data 2 0

only "modes" can be found

[BenR]

Hello,

Currently the JSON encoder/decoder can only work with flat style JSON data as in your first example.

Supporting arrays would indeed be nice so I'll see if it's something we can add.

[Xbiotec]

yes please Ben because on my project, I don't have only flat style JSON and it's a big problem for me .

[BenR]

Hello,

Right I've made a change to the decoder component and it should hopefully now work a lot better when working with nested data.

For your example

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{"modes":{"fastmode":{"completed":true}}}

I get a count of 3 values detected but now the names and values look like this.

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"modes" - "fastmode"
"fastmode" - "completed"
"completed" - "true"

For your first example it should also behaive better in terms of storage space and remove all unnessisary formatting like spaces and new lines outside of quoted strings.

It's now available via the library updates. Let me know how you get on.

[Xbiotec]

Thx Ben, I will test and let you know.