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Title: Working With JSON Data (Video) – Real Python

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Description: Welcome back to our series on working with JSON data in Python. In this video, we’re going to work with a larger set of JSON data and we’ll see how we can manipulate the data to derive some meaning from it. To get our JSON data I’ll use…

Open Graph Description: Welcome back to our series on working with JSON data in Python. In this video, we’re going to work with a larger set of JSON data and we’ll see how we can manipulate the data to derive some meaning from it. To get our JSON data I’ll use…

Opengraph URL: https://realpython.com/lessons/working-json-data-python/

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jsonplaceholder.typicode.com/todoshttps://jsonplaceholder.typicode.com/todos
00:00https://realpython.com/lessons/working-json-data-python/#t=0.51
Welcome back to our series on working with JSON data in Python. In thishttps://realpython.com/lessons/working-json-data-python/#t=0.51
video, we’re going to work with a larger set of JSON datahttps://realpython.com/lessons/working-json-data-python/#t=4.83
and we’ll see how we can manipulate the data to derive some meaning from it.https://realpython.com/lessons/working-json-data-python/#t=8.64
00:13https://realpython.com/lessons/working-json-data-python/#t=13.53
To get our JSON data I’ll use JSONPlaceholder,https://realpython.com/lessons/working-json-data-python/#t=13.53
which is a public API that exposes large sets of JSON data for testing andhttps://realpython.com/lessons/working-json-data-python/#t=17.43
prototyping purposes. Just like usual,https://realpython.com/lessons/working-json-data-python/#t=22.86
we’ll start by importing the json modulehttps://realpython.com/lessons/working-json-data-python/#t=26.37
but we’ll also need to import another module named requests.https://realpython.com/lessons/working-json-data-python/#t=29.13
00:33https://realpython.com/lessons/working-json-data-python/#t=33.48
This will allow us to get JSON data from the JSONPlaceholder APIhttps://realpython.com/lessons/working-json-data-python/#t=33.48
in the form of a web request. Now we need to actually make the request.https://realpython.com/lessons/working-json-data-python/#t=38.4
We’ll create a new variable called response,https://realpython.com/lessons/working-json-data-python/#t=43.05
which will hold the response from the web server.https://realpython.com/lessons/working-json-data-python/#t=45.81
00:48https://realpython.com/lessons/working-json-data-python/#t=48.45
We’ll get that using requests.get()https://realpython.com/lessons/working-json-data-python/#t=48.45
and we’ll pass in this web address right here,https://realpython.com/lessons/working-json-data-python/#t=51.48
which contains a TODO list of 200 items formatted in JSON format. To actuallyhttps://realpython.com/lessons/working-json-data-python/#t=54.3
obtain a Python list from this JSON data,https://realpython.com/lessons/working-json-data-python/#t=60.63
we’ll create another variable called todos and we’ll use the loads() method fromhttps://realpython.com/lessons/working-json-data-python/#t=63.99
before, passing in response.text.https://realpython.com/lessons/working-json-data-python/#t=69.03
01:12https://realpython.com/lessons/working-json-data-python/#t=72.39
response.text will get us the content of our web request,https://realpython.com/lessons/working-json-data-python/#t=72.39
which is a string containing all of the JSON data.https://realpython.com/lessons/working-json-data-python/#t=76.41
And that’s why we’re using the loads() method—because we’re reading from ahttps://realpython.com/lessons/working-json-data-python/#t=79.53
string, not a file object. Just to show that this works,https://realpython.com/lessons/working-json-data-python/#t=83.19
I’ll print out the first two items in our list with print(todos[:2]).https://realpython.com/lessons/working-json-data-python/#t=87.72
01:35https://realpython.com/lessons/working-json-data-python/#t=95.76
If I right-click and run the code,https://realpython.com/lessons/working-json-data-python/#t=95.76
we’ll see that on the right side of the screen,https://realpython.com/lessons/working-json-data-python/#t=98.01
we have the first two TODO items that is exposed by the API.https://realpython.com/lessons/working-json-data-python/#t=99.81
Each TODO item is a Python dictionary with keys and values.https://realpython.com/lessons/working-json-data-python/#t=105.3
01:50https://realpython.com/lessons/working-json-data-python/#t=110.04
Notice that each TODO object contains a 'userId' representing the user assignedhttps://realpython.com/lessons/working-json-data-python/#t=110.04
to this TODO; an 'id', which is used to label thehttps://realpython.com/lessons/working-json-data-python/#t=114.99
TODO; a 'title' describing it; and finally, whether or not thehttps://realpython.com/lessons/working-json-data-python/#t=118.89
TODO is completed.https://realpython.com/lessons/working-json-data-python/#t=123.33
02:04https://realpython.com/lessons/working-json-data-python/#t=124.98
We’re going to make use of all of this data except for the 'title'.https://realpython.com/lessons/working-json-data-python/#t=124.98
Now, we don’t want to see the data—we want to actually manipulate it.https://realpython.com/lessons/working-json-data-python/#t=128.789
So let’s just delete this print statement here.https://realpython.com/lessons/working-json-data-python/#t=132.78
02:15https://realpython.com/lessons/working-json-data-python/#t=135.72
We want to figure out which users have completed the most TODO items.https://realpython.com/lessons/working-json-data-python/#t=135.72
We’ll start by creating a new dictionary called todos_by_user,https://realpython.com/lessons/working-json-data-python/#t=140.73
which will map each 'userId' to the number of TODOs that they have completed.https://realpython.com/lessons/working-json-data-python/#t=145.8
02:31https://realpython.com/lessons/working-json-data-python/#t=151.14
Now, we actually have to compute that. So on a new line,https://realpython.com/lessons/working-json-data-python/#t=151.14
we’ll type for todo in todos:,https://realpython.com/lessons/working-json-data-python/#t=154.77
which will iterate through our todos list.https://realpython.com/lessons/working-json-data-python/#t=158.07
02:41https://realpython.com/lessons/working-json-data-python/#t=161.07
And we’ll say if todo["completed"]:—so here we’re checkinghttps://realpython.com/lessons/working-json-data-python/#t=161.07
if the "completed" key has a value of True.https://realpython.com/lessons/working-json-data-python/#t=165.27
And then we will wrap the following logic in a try block. We’ll say,https://realpython.com/lessons/working-json-data-python/#t=168.42
“Get the user’s count in a dictionary with this code right here.”https://realpython.com/lessons/working-json-data-python/#t=173.16
And we’ll increment it by 1.https://realpython.com/lessons/working-json-data-python/#t=177.12
02:59https://realpython.com/lessons/working-json-data-python/#t=179.23
Our dictionary is going to represent the users by their "userId",https://realpython.com/lessons/working-json-data-python/#t=179.23
which is why we’re accessing the value of the "userId" key in this todohttps://realpython.com/lessons/working-json-data-python/#t=183.19
dictionary. But if the user is not already present in our dictionary,https://realpython.com/lessons/working-json-data-python/#t=187.42
we’ll see a KeyError,https://realpython.com/lessons/working-json-data-python/#t=192.58
and so we’ll need to catch that by typing except KeyError:https://realpython.com/lessons/working-json-data-python/#t=193.84
and then we’ll create a new user in the dictionary, setting their completedhttps://realpython.com/lessons/working-json-data-python/#t=198.37
TODOs count to 1. At this point,https://realpython.com/lessons/working-json-data-python/#t=202.75
we’ve got a dictionary that maps each 'userId' to the number of items they’vehttps://realpython.com/lessons/working-json-data-python/#t=206.08
completed.https://realpython.com/lessons/working-json-data-python/#t=210.58
03:31https://realpython.com/lessons/working-json-data-python/#t=211.87
Now we have to determine what the highest number of completed items is, as wellhttps://realpython.com/lessons/working-json-data-python/#t=211.87
as who’s completed that many items.https://realpython.com/lessons/working-json-data-python/#t=216.73
This code I’m typing now is going to create a new list of tuples with eachhttps://realpython.com/lessons/working-json-data-python/#t=219.52
tuple containing the person as well as how many items they’ve computed.https://realpython.com/lessons/working-json-data-python/#t=224.02
03:48https://realpython.com/lessons/working-json-data-python/#t=228.7
The tuples will be sorted in descending order by the number of items completed.https://realpython.com/lessons/working-json-data-python/#t=228.7
03:53https://realpython.com/lessons/working-json-data-python/#t=233.95
And now all we have to do is get the second value in the first tuple in thehttps://realpython.com/lessons/working-json-data-python/#t=233.95
list, and this will represent the maximum number of items completed.https://realpython.com/lessons/working-json-data-python/#t=238.36
We’ll type max_complete = top_users,https://realpython.com/lessons/working-json-data-python/#t=243.16
first index, second item. In order to determine which users have this completedhttps://realpython.com/lessons/working-json-data-python/#t=249.07
count, I’ll first define a new list called users,https://realpython.com/lessons/working-json-data-python/#t=255.16
which will hold the users that we discover. Now,https://realpython.com/lessons/working-json-data-python/#t=258.88
we’ll say for user, num_complete in top_users:—https://realpython.com/lessons/working-json-data-python/#t=262.36
so now we’re iterating over the list of tuples. We’ll typehttps://realpython.com/lessons/working-json-data-python/#t=268.84
if num_complete < max_complete:https://realpython.com/lessons/working-json-data-python/#t=272.83
then break. Otherwise, append a string representation of our user ID to the usershttps://realpython.com/lessons/working-json-data-python/#t=277.24
list.https://realpython.com/lessons/working-json-data-python/#t=284.14
04:45https://realpython.com/lessons/working-json-data-python/#t=285.67
Then we’ll create a new string that tells us what users have completed the mosthttps://realpython.com/lessons/working-json-data-python/#t=285.67
TODOs.https://realpython.com/lessons/working-json-data-python/#t=290.8
We’ll call this max_users and we’ll take the string " and " padded withhttps://realpython.com/lessons/working-json-data-python/#t=292.09
space and .join() it with our list of users. Finally,https://realpython.com/lessons/working-json-data-python/#t=297.52
we’ll print the f-string f"user(s) {max_users} completed {max_complete} TODOs".https://realpython.com/lessons/working-json-data-python/#t=302.05
05:10https://realpython.com/lessons/working-json-data-python/#t=310.96
So now when we run this code,https://realpython.com/lessons/working-json-data-python/#t=310.96
we’ll see user(s) 5 and 10 completed 12 TODOs.https://realpython.com/lessons/working-json-data-python/#t=313.36
If you’d like,https://realpython.com/lessons/working-json-data-python/#t=317.89
you can verify that this is correct by heading to the web address at the top ofhttps://realpython.com/lessons/working-json-data-python/#t=318.88
our file and viewing the JSON data for yourself.https://realpython.com/lessons/working-json-data-python/#t=323.05
05:26https://realpython.com/lessons/working-json-data-python/#t=326.65
Now for our final task,https://realpython.com/lessons/working-json-data-python/#t=326.65
let’s create a JSON file that contains all of the completed TODOs for eachhttps://realpython.com/lessons/working-json-data-python/#t=328.96
of these users. At this point, we have the data for all of thehttps://realpython.com/lessons/working-json-data-python/#t=333.4
TODO items as well as the two users who have completed the most,https://realpython.com/lessons/working-json-data-python/#t=337.48
so we can do this. When we’re done,https://realpython.com/lessons/working-json-data-python/#t=341.8
we should have a JSON file containing only thehttps://realpython.com/lessons/working-json-data-python/#t=344.17
TODO items completed by users 5 and 10.https://realpython.com/lessons/working-json-data-python/#t=346.69
05:50https://realpython.com/lessons/working-json-data-python/#t=350.83
We’ll start by defining a new functionhttps://realpython.com/lessons/working-json-data-python/#t=350.83
keep(), which will take a single todo object as its parameter.https://realpython.com/lessons/working-json-data-python/#t=353.05
Remember: this todo object is now a Python dictionary representing a singlehttps://realpython.com/lessons/working-json-data-python/#t=357.77
TODO item, and we obtain that through deserialization.https://realpython.com/lessons/working-json-data-python/#t=363.18
06:08https://realpython.com/lessons/working-json-data-python/#t=368.06
This function will be used to filter out all of thehttps://realpython.com/lessons/working-json-data-python/#t=368.06
TODO items that were not completed by either of the top users.https://realpython.com/lessons/working-json-data-python/#t=370.55
06:15https://realpython.com/lessons/working-json-data-python/#t=375.29
First, we have to figure out if the item is even completed,https://realpython.com/lessons/working-json-data-python/#t=375.29
so we’ll say is_complete = todo["completed"].https://realpython.com/lessons/working-json-data-python/#t=378.5
06:24https://realpython.com/lessons/working-json-data-python/#t=384.59
Then, we’ll see if this item was assigned to one of the top two users,https://realpython.com/lessons/working-json-data-python/#t=384.59
so we’ll writehttps://realpython.com/lessons/working-json-data-python/#t=389.03
has_max_count = todo["userId"] in users.https://realpython.com/lessons/working-json-data-python/#t=390.35
users is a list of users 5 and 10,https://realpython.com/lessons/working-json-data-python/#t=398.75
so we’re looking to see if this item was assigned to either of those people.https://realpython.com/lessons/working-json-data-python/#t=401.93
06:46https://realpython.com/lessons/working-json-data-python/#t=406.46
Finally,https://realpython.com/lessons/working-json-data-python/#t=406.46
we’ll return is_complete and has_max_count, since both of these Booleans need tohttps://realpython.com/lessons/working-json-data-python/#t=407.15
be True in order for the todo item to stay in our list.https://realpython.com/lessons/working-json-data-python/#t=413.06
06:57https://realpython.com/lessons/working-json-data-python/#t=417.11
Now that we have our filtering function,https://realpython.com/lessons/working-json-data-python/#t=417.11
we can write some JSON data to a file. Just like beforehttps://realpython.com/lessons/working-json-data-python/#t=419.15
we’ll say with open("filtered_data_file.json")https://realpython.com/lessons/working-json-data-python/#t=422.42
but now we’ll give it the argument "w" to tell Python we want to write to thishttps://realpython.com/lessons/working-json-data-python/#t=428.33
file. And we’ll give it the identifier data_file. Inside the with block,https://realpython.com/lessons/working-json-data-python/#t=432.17
I want to obtain a list of only the items that were completed by users 5 and 10,https://realpython.com/lessons/working-json-data-python/#t=438.68
so I’ll say filtered_todos = list()https://realpython.com/lessons/working-json-data-python/#t=443.72
and then we’ll call the filter() function with our filter function keephttps://realpython.com/lessons/working-json-data-python/#t=448.61
and our todos list, which contains all of the TODO items.https://realpython.com/lessons/working-json-data-python/#t=453.5
07:38https://realpython.com/lessons/working-json-data-python/#t=458.15
Now that we’ve got this list, we can say json.dump()https://realpython.com/lessons/working-json-data-python/#t=458.15
and we’ll keep it the list of filtered_todos and the data_file we’re writing to.https://realpython.com/lessons/working-json-data-python/#t=462.2
07:47https://realpython.com/lessons/working-json-data-python/#t=467.09
And finally, an indentation level of 2, which will make it easier to read.https://realpython.com/lessons/working-json-data-python/#t=467.09
And that’s all we need to do for this program!https://realpython.com/lessons/working-json-data-python/#t=472.22
If we right-click here and we choose Run Code,https://realpython.com/lessons/working-json-data-python/#t=475.34
we’ll see our expected output: user(s) 5 and 10 completed 12 TODOs.https://realpython.com/lessons/working-json-data-python/#t=478.46
08:04https://realpython.com/lessons/working-json-data-python/#t=484.1
But if we head over to our new JSON file that’s been created,https://realpython.com/lessons/working-json-data-python/#t=484.1
you’ll notice that we have a problem. It’s empty,https://realpython.com/lessons/working-json-data-python/#t=487.94
but it’s supposed to have all of the items completed by users 5 and 10,https://realpython.com/lessons/working-json-data-python/#t=491.75
since they’ve completed the greatest amount of items.https://realpython.com/lessons/working-json-data-python/#t=496.13
08:19https://realpython.com/lessons/working-json-data-python/#t=499.16
So let’s head back to our code here and start the debugging process.https://realpython.com/lessons/working-json-data-python/#t=499.16
I will say the bug in this program has nothing to do with the JSONhttps://realpython.com/lessons/working-json-data-python/#t=503.18
serialization or deserialization,https://realpython.com/lessons/working-json-data-python/#t=506.99
so I would encourage you to pause the video and step through this code with yourhttps://realpython.com/lessons/working-json-data-python/#t=509.72
favorite debugger. Personally, I like the Visual Studio debugger,https://realpython.com/lessons/working-json-data-python/#t=513.53
so I’m going to use that.https://realpython.com/lessons/working-json-data-python/#t=517.73
08:39https://realpython.com/lessons/working-json-data-python/#t=519.65
Now we know everything up until our print statement is working because we gothttps://realpython.com/lessons/working-json-data-python/#t=519.65
the right print() output in the console,https://realpython.com/lessons/working-json-data-python/#t=524.27
so let’s safely ignore all that. I suspect the issue is in our filteringhttps://realpython.com/lessons/working-json-data-python/#t=526.28
function. I think it might be filtering everything out of our TODO list,https://realpython.com/lessons/working-json-data-python/#t=530.9
which is why no data is actually getting serialized.https://realpython.com/lessons/working-json-data-python/#t=535.77
08:59https://realpython.com/lessons/working-json-data-python/#t=539.34
I’m going to set a breakpoint on the last line in the function,https://realpython.com/lessons/working-json-data-python/#t=539.34
and then I will start the program with debugging.https://realpython.com/lessons/working-json-data-python/#t=543.6
Now that we’re stopped here on the return line,https://realpython.com/lessons/working-json-data-python/#t=547.17
we could sit here and step through each item until the bug reveals itself,https://realpython.com/lessons/working-json-data-python/#t=549.6
but I’ll save you the hassle and I’ll just tell you what it is.https://realpython.com/lessons/working-json-data-python/#t=553.65
09:17https://realpython.com/lessons/working-json-data-python/#t=557.49
If we hover over the users variable here,https://realpython.com/lessons/working-json-data-python/#t=557.49
we can see that users 5 and 10 are represented as strings. That’s because wehttps://realpython.com/lessons/working-json-data-python/#t=560.37
appended the users as strings earlier so that we could print them out in a nicehttps://realpython.com/lessons/working-json-data-python/#t=565.86
formatted manner. But if I hover over todo here,https://realpython.com/lessons/working-json-data-python/#t=570.24
notice that 'userId' is actually an int. Right now, we’re asking Python if anhttps://realpython.com/lessons/working-json-data-python/#t=574.29
integer is in a list of strings,https://realpython.com/lessons/working-json-data-python/#t=579.75
and so has_max_count is always set to False,https://realpython.com/lessons/working-json-data-python/#t=582.3
even when we’re comparing the integer 5 to the string '5'.https://realpython.com/lessons/working-json-data-python/#t=585.78
09:50https://realpython.com/lessons/working-json-data-python/#t=590.1
There’s a few different ways we can fix this,https://realpython.com/lessons/working-json-data-python/#t=590.1
but the easiest is just to convert this to a stringhttps://realpython.com/lessons/working-json-data-python/#t=591.99
before we compare it. This way,https://realpython.com/lessons/working-json-data-python/#t=595.53
we’re comparing two strings and not an integer and a string,https://realpython.com/lessons/working-json-data-python/#t=597.78
which will always be False.https://realpython.com/lessons/working-json-data-python/#t=601.83
10:03https://realpython.com/lessons/working-json-data-python/#t=603.93
And now if I stop the debugger and I run this code again,https://realpython.com/lessons/working-json-data-python/#t=603.93
we should see that we still have our correct console output,https://realpython.com/lessons/working-json-data-python/#t=608.13
but if we head over to the JSON file,https://realpython.com/lessons/working-json-data-python/#t=611.55
we have all of the items that users 5 and 10 have completed.https://realpython.com/lessons/working-json-data-python/#t=614.49
10:18https://realpython.com/lessons/working-json-data-python/#t=618.75
Fortunately for us, that wasn’t too hard of a bug to find. In the next video,https://realpython.com/lessons/working-json-data-python/#t=618.75
we’ll take a look at how we can encode custom Python objects or otherwisehttps://realpython.com/lessons/working-json-data-python/#t=623.43
non-serializable types into JSON format.https://realpython.com/lessons/working-json-data-python/#t=628.09
May 11, 2019https://realpython.com/lessons/working-json-data-python/#comment-d1cd9b69-cde4-4699-9a44-09ae2e2ba6a7
June 12, 2019https://realpython.com/lessons/working-json-data-python/#comment-75bef806-922c-40fd-9f0c-430ac602c2d2
Nov. 12, 2019https://realpython.com/lessons/working-json-data-python/#comment-5cccc2a9-ec0d-41d9-8ef8-5d54048dfe11
March 28, 2020https://realpython.com/lessons/working-json-data-python/#comment-938a1217-4813-4675-8341-dc56f2fc93a2
April 24, 2020https://realpython.com/lessons/working-json-data-python/#comment-60cf7b59-b6af-472f-a5de-6ba4250087fa
May 7, 2020https://realpython.com/lessons/working-json-data-python/#comment-b005c11a-a129-4720-bef8-1ba2470929df
May 7, 2020https://realpython.com/lessons/working-json-data-python/#comment-10300798-0030-4b58-a647-a28481df42eb
Aug. 9, 2020https://realpython.com/lessons/working-json-data-python/#comment-841623fa-d11a-4b6c-9bd8-9eb15db6c502
July 15, 2021https://realpython.com/lessons/working-json-data-python/#comment-01523f9b-e200-4ac0-9bdf-1b9e8dc16199
July 16, 2021https://realpython.com/lessons/working-json-data-python/#comment-9ddc247c-2c30-49c3-96de-ea1088f73a39
July 16, 2021https://realpython.com/lessons/working-json-data-python/#comment-edc744fc-fe8f-4075-a2a0-0890ec862c0a
@ravipgupta12https://realpython.com/lessons/working-json-data-python/#comment-5cccc2a9-ec0d-41d9-8ef8-5d54048dfe11
@Ranit Pradhanhttps://realpython.com/lessons/working-json-data-python/#comment-938a1217-4813-4675-8341-dc56f2fc93a2
@Jhttps://realpython.com/lessons/working-json-data-python/#comment-b005c11a-a129-4720-bef8-1ba2470929df
Debuggerhttps://code.visualstudio.com/Docs/editor/debugging
@Jhttps://realpython.com/lessons/working-json-data-python/#comment-10300798-0030-4b58-a647-a28481df42eb
Python’s filter(): Extract Values From Iterableshttps://realpython.com/python-filter-function/#getting-started-with-pythons-filter
@yaosthttps://realpython.com/lessons/working-json-data-python/#comment-01523f9b-e200-4ac0-9bdf-1b9e8dc16199
Sept. 1, 2021https://realpython.com/lessons/working-json-data-python/#comment-411c9d3d-1903-4e8b-b3bc-7f3161a18dbb
March 2, 2022https://realpython.com/lessons/working-json-data-python/#comment-8d2edcd0-7874-400e-9d0c-15fdb56e8d63
May 27, 2023https://realpython.com/lessons/working-json-data-python/#comment-8b093332-da46-4ee1-8fbd-a89ad0c0bf3c
July 22, 2024https://realpython.com/lessons/working-json-data-python/#comment-2062e050-c481-41d5-b47b-3e40a4b940cf
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What Is JSON? 04:48 https://realpython.com/videos/what-is-json/
Serializing JSON Data 04:39 https://realpython.com/videos/serializing-json-data/
Deserializing JSON Data 03:04 https://realpython.com/lessons/deserializing-json-data/
Working With JSON Data 10:34 https://realpython.com/lessons/working-json-data-python/
JSON for Custom Python Objects 04:18 https://realpython.com/lessons/json-custom-python-objects/
Encoding Custom Types to JSON 04:02 https://realpython.com/lessons/encoding-custom-types-json/
Decoding Custom Types From JSON 04:59 https://realpython.com/lessons/decoding-custom-types-json/
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