JSON decode extra character error

I have tried using both of these scripts to decode json files into matlab structures.

filename='sample.json';
str=fileread(filename);
JSONstruc=jsondecode(str);

filename='sample.json';
fid=fopen(filename);
raw=fread(fid,inf);
str=char(raw');
fclose(fid);
JSONstruc=jsondecode(str);

Both versions work fine for one sample json file but I get the same error for a second json file

Error using jsondecode

JSON syntax error at line 2,column 1(character ____):extra text

I'm using Matlab R2023b.

[Sandeep Mishra]

Hi @Paulo

Is the error occurring in just one specific file? If so, there might be an issue with that JSON file. Could you please share it for better analysis?

Answer 1

[Kautuk Raj]

Hi @Paulo,

It looks like jsondecode is throwing an error because the input string is not valid JSON. It may be possible that two JSON files are concatenated together which is causing this issue.

You can inspect your JSON file to check for its validity and carry out the workflow again.