Trouble with jsondecode() and jsonencode()

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Rui Zhang on 3 May 2021

Commented: Rui Zhangon 3 May 2021

I have a JSON file. I am trying to test the MATLAB functions before using them. So I loaded it

str1 = fileread('json_filename1.json');

mydata1 = jsondecode(str1)

str2 = jsonencode(mydata1)

fid = fopen('json_filename2.json','wt')

fprintf(fid,str2)

fclose(fid)

Then I go to the online JSON file editor: https://jsoneditoronline.org/#left=local.jagoxe to load both files. I am able to load 'json_filename1.json' but I can't load 'json_filename2.json' correctly. I got the following error message:

Failed to switch to "tree " mode because of Invalid JSON:

在1号线解析错误:

...,"errorDescription":"CreateACPath Execut

-----------------------^

Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '[', got 'undefined'

It looks like either jsondecode() or jsonencode() has something wrong.

Also, when I used strcmp(str1,str2), I saw a lot of difference between them.

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the cyclist on 3 May 2021

No, sorry.

But perhaps you could distill your JSON down to a simplified and/or obscured version that still shows the problem, but you are comfortable sharing? (This may also help narrow down exactly what is causing the issue.)

Answers (1)

Sean de Wolski on 3 May 2021

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//www.tatmou.com/matlabcentral/answers/820745-trouble-with-jsondecode-and-jsonencode#answer_691035

fprintf(fid,"%s",str2)

That way if there are format spec characters in the JSON they are not interpretted as such.

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Rui Zhang on 3 May 2021

It works.

Thank you!

Rui

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