Convert Struct to Readable JSON(Pretty Print)

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ILoveMATLAB
ILoveMATLAB on 4 Sep 2019
Commented: ILoveMATLAB on 17 May 2022
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"
}
]
}
  3 Comments

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Accepted Answer

Sean Bone
Sean Bone on 30 Jan 2022
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.
  1 Comment
ILoveMATLAB
ILoveMATLAB on 17 May 2022
I guess I will accept this anwser; although, I was using an older version of matlab when I wrote this question.

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More Answers (1)

Gaurav Garg
Gaurav Garg on 20 Nov 2019
Hi,
You can find a function which can help you resolve the problem you are facing in this file.
  1 Comment
Laurel Keyes
Laurel Keyes on 28 Jun 2021
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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