How to update json file with MATLAB?

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Yaser Khojah
Yaser Khojah 2020-2-9
评论： Kojiro Saito 2022-3-3
I have json file that is read by MATLAB script. I’m looking for a way to update the file since there are many to update. I know I can fixed the MATLAB script but I want to keep it and just fix the details in the json file.
I could not upload the json file since it does not accept it here. I converted to a txt one.
What I need to do is the following (in row 209)
For example. I have "HighPrice" :12000 and I want to change it to "HighPrice" :11000,
Anyway, MATLAB can fix this rather than doing it manually please?

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Kojiro Saito
Kojiro Saito 2020-2-10
From R2016b, MATLAB can handle JSON format easily with jsondecode and jsonencode.
Here is a snippet to change the value of JSON and write to a file.
jsonText = fileread('Portfolio.json');
% Convert JSON formatted text to MATLAB data types (3x1 cell array in this example)
jsonData = jsondecode(jsonText);
% Change HighPrice value in Row 3 from 10000 to 12000
jsonData{3}.HighPrice = 12000;
% Convert to JSON text
jsonText2 = jsonencode(jsonData);
% Write to a json file
fid = fopen('Portfolio2.json', 'w');
fprintf(fid, '%s', jsonText2);
fclose(fid);
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Roger Dettloff
Roger Dettloff 2022-3-3
For a more human readable output:
jsonText2 = jsonencode(jsonData,'PrettyPrint',true);
Kojiro Saito
Kojiro Saito 2022-3-3
Yes, 'PrettyPrint' option in jsonencode is available from R2021a.

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