Convert Struct to Readable JSON(Pretty Print)
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Every struct I pass to jsonecode gets converted to a 1 by N char array with no newline chacters. Therefore, when I export the json as to a text file I only have one line. The file is not easly readble because I have to scroll the JSON text horizontaly. How can I make jsonencode's output easily readable(pretty print)?
I get this.
{ "firstName": "John", "lastName": "Smith", "age": 25, "address": { "streetAddress": "3 Apple Hill Dr", "city": "Natick", "state": "MA", "postalCode": "01760" }, "phoneNumber": [ { "type": "home", "number": "123 456 7890" }, { "type": "cell", "number": "098 765 4321" } ] }
I want something like this.
{
"firstName": "John",
"lastName": "Smith",
"age": 25,
"address":
{
"streetAddress": "3 Apple Hill Dr",
"city": "Natick",
"state": "MA",
"postalCode": "01760"
},
"phoneNumber":
[
{
"type": "home",
"number": "123 456 7890"
},
{
"type": "cell",
"number": "098 765 4321"
}
]
}
5 个评论
Jan Zalewski
2021-5-21
I have the same problem
according to documentation jsonencode has "PrettyPrint" value that shoudl do just that, unfortunately this doesn't seem to be working on newer version of matlab
Davide Serina
2022-12-8
移动：DGM
2022-12-8
ciao, come si fa ad ottenere una struttura come quella che hai scritto partendo da una struttura su matlab?! cioè non riesco a fare gli annidamenti. bisogna usare un ciclo for???
Sean Bone
2022-12-9
Ciao @Davide Serina, la tua domanda si riferisce a come creare una struttura annidata in MATLAB o a come convertire una struttura annidata in JSON? Oppure ancora a come convertire una struttura MATLAB in JSON con le indentature per rappresentare gli annidamenti?
采纳的回答
Sean Bone
2022-1-30
In more recent Matlab versions, you can do the following:
jsonencode(data, "PrettyPrint", true);
Note that this option was only introduced in Matlab R2021a, despite the documentation for jsonencode not mentioning this explicitly.
更多回答（2 个）
Robin Larsson Nordström
2023-10-3
编辑：Robin Larsson Nordström
2023-10-3
For the provided example the default pretty print output will be fine:
txt=jsonencode(data, "PrettyPrint", true);
However if the input data struct contains fields with vectors or matrices the jsonencode PrettyPrint in Matlab 2023b adds a newline for each element, making the encoded text hard to read even when the number of elements are not that many.
Post-processing the output with a few regexprep lines to remove white-spaces inside vectors and matrices have worked well for me. Example below with the struct from the Matlab help on jsonencode PrettyPrint example with the addition of an extra field Q storing a 4 X 4 matrix:
s=[];
s.Width = 800;
s.Height = 600;
s.Title = 'View from the 15th Floor';
s.Animated = false;
s.IDs = [116, 943, 234, 38793];
s.Q = round(randn(4),3);
txt=jsonencode(s,PrettyPrint=true)
% remove white-spaces inside vectors and matrices
txt = regexprep(txt,',\s+(?=\d)',','); % , white-spaces digit
txt = regexprep(txt,',\s+(?=-)',','); % , white-spaces minussign
txt = regexprep(txt,'[\s+(?=\d)','['); % [ white-spaces digit
txt = regexprep(txt,'[\s+(?=-)','['); % [ white-spaces minussign
txt = regexprep(txt,'(?<=\d)\s+]',']'); % digit white-spaces ]
txt
Gaurav Garg
2019-11-20
0 个投票
Hi,
1 个评论
Laurel Keyes
2021-6-28
This file is helpful but not if you have nested structures. I use a quick and dirty method, where you just string-replace the commas or brackets like so:
% assuming your structure is saved to val:
str = jsonencode(val);
% add a return character after all commas:
new_string = strrep(str, ',', ',\n');
% add a return character after curly brackets:
new_string = strrep(new_string, '{', '{\n')
% etc...
% Write the string to file
fid = fopen("filename.json",'w')
fprint(fid, new_string);
fclose(fid);
This method will not indent but does allow a slightly better formatting, no matter the structure of your json
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