How to import a JSON file into MATLAB programatically?

Question

I am trying to load my data from a JSON file into MATLAB that is delimited with ,. The format of my data is as follows:

{"created_at": "Mon Oct 27 20:35:47 +0000 2014", "tweet": "Silver Finished Up, Gold, Copper, Crude Oil, Nat Gas Down - Live Trading News http://t.co/jNLTUIgHwA", "id": 526834668759285761, "sentiment": "negative"}

{"created_at": "Mon Oct 27 20:36:21 +0000 2014", "tweet": "Gold, Silver slips on lacklustre demand- The Economic Times http://t.co/Jd5Tn9ctfX", "id": 526834810300289024, "sentiment": "negative"}

How would I do so?

Solution

As of version 2016b, Matlab has integrated json support.

See: https://www.mathworks.com/help/matlab/ref/jsondecode.html

In short, you do:

jsonData = jsondecode(fileread('file.json'));

Comments

[Adam]

when calling the function What parameters must i specify ?

[Adam]

what does varargin refer to ?

[Adam]

Undefined function or variable 'varargin2struct'. Error in loadjson (line 61) opt=varargin2struct(varargin{:});

[klurie]

varargin allows you to have variable input arguments. I'm attaching the file I used so you can check if it's your file or something else...

[Adam]

yh thats fine but what parameter should i pass as varargin

[klurie]

You should use the function call I provided: tweet_info = loadjson(FILE_NAME_WITH_PATH). THere should be no need for additional arguments to the function.