I Pulled Nine Years of My Own Dev.to Data. The Numbers Were Not What I Expected.

There is an API. It will tell you things about your writing that the dashboard will not.

I have been publishing on Dev.to since April 2017. There is a four-year hole in the middle where I posted almost nothing, and then a return in March 2026 that has produced eighty-six posts in six months.

That shape turns out to be useful. Two distinct bodies of work, on the same account, separated by a gap long enough that the platform itself changed underneath them. A natural experiment I did not set out to run.

What I wanted was simple: a chart of follower growth with my article publication dates overlaid, to see whether particular posts moved the line. What I got instead was a fairly uncomfortable education in which of my numbers mean anything.

The API made all of it possible, and almost nobody seems to use it.

Yes, There Is an API

Base URL is https://dev.to/api`. You generate a key at **Settings → Extensions → DEV Community API Keys**. Most read endpoints for your own data want that key in anapi-key` header.

There is one detail that will silently ruin your afternoon:

headers = {
    "api-key": key,
    # Omit this and you get v0 responses. No error. No warning.
    "accept": "application/vnd.forem.api-v1+json",
    "user-agent": "my-analytics-script/1.0",
}

Without the accept header you are served the older v0 serializer. Nothing fails. The shapes are just quietly different, and you will spend twenty minutes wondering why a documented field is missing.

Trick One: The Default Page Size Is Not the Maximum

The followers endpoint is documented as returning 80 per page. I have a little over eighteen thousand followers, which is 227 round trips.

The v1 pagination range actually runs to 1000. The 80 is a default, not a ceiling:

batch = client.get(
    f"{API_ROOT}/followers/users",
    params={"page": page, "per_page": 1000},
).json()

Nineteen requests instead of 227. Thirty-one seconds instead of however long 227 polite requests would have taken.

A Forem instance can cap per_page lower through an environment variable, so do not hardcode the assumption. Ask for the maximum, then learn the real stride from what comes back:

if page == 1 and len(batch) < requested:
    # Either the server capped us or that is the entire list.
    # Either way, this is the real page size.
    page_size = len(batch)

Rate limiting is real and it is not gentle. Back off on 429, sleep between pages, and checkpoint your merged results to disk every few pages. A long first pull that dies on page 190 should not discard the previous 189.

Trick Two: Follower Dates Reconstruct History You Never Recorded

This is the single most useful thing in the API and it is easy to miss.

/api/followers/users returns a created_at on every follower: the date that person started following you. You do not need to snapshot your follower count daily and wait six months to accumulate a time series. One pull reconstructs the entire curve retroactively, back to your first follower.

from collections import Counter
from datetime import date, timedelta

dates = sorted(
    date.fromisoformat(f["created_at"][:10]) for f in followers
)
cumulative = list(range(1, len(dates) + 1))  # the growth curve, free

weekly = Counter(d - timedelta(days=d.weekday()) for d in dates)

Line chart of cumulative Dev.to followers from 2017 to 2026. The line is nearly flat until March 2026, then rises steeply to about 18,000 by September. Dotted vertical markers show article publication dates. A dashed second line excluding auto-generated usernames tracks noticeably lower

There is a catch worth stating plainly, because it took me a moment to see it. You only receive people who currently follow you. Anyone who followed and later unfollowed has vanished from the dataset. So the curve is “current followers by acquisition date,” not your follower count as it stood on any given day. It increases monotonically by construction and can never show you a decline that actually happened.

For working out which posts drove acquisition, fine. For anything about retention, actively misleading.

Trick Three: The Analytics Endpoints Exist and Are Barely Documented

There is a whole analytics family that most third-party tooling ignores:

/api/analytics/totals               lifetime views, reactions, comments
/api/analytics/historical           daily series over a date range
/api/analytics/past_day             hourly, last 24 hours
/api/analytics/referrers            where the traffic came from
/api/analytics/follower_engagement  follower growth over time
/api/analytics/dashboard            totals + history + top posts, bundled

All accept article_id to scope to a single post. Two things to know.

The responses nest. They are not flat integers:

{"page_views": {"total": 246454, "average_read_time_in_seconds": 306}}

And the historical data degrades as you go back. For my 2017 posts the endpoint returns weekly buckets rather than daily rows, and in aggregate accounts for only about 15% of those posts’ lifetime views. For 2019 it covers 95%. For 2026, 100%.

That matters more than it sounds. I computed a “half-life” for each post, meaning days from publication until it had earned half its views to date. My first attempt confidently reported that several 2017 posts had half-lives around 3,000 days. They do not. The endpoint simply does not remember most of what those posts earned, and dividing a remembered fraction produces a precise, authoritative, meaningless number.

The fix is a coverage gate:

lifetime = article["page_views_count"]
tracked = sum(daily_series.values())

# A series accounting for 15% of a post's views will still yield a
# confident half-life. It will be an artifact of what the endpoint
# retained, not of how the post aged.
if lifetime and tracked < lifetime * 0.8:
    continue

Eighty-two of my 130 posts survive that gate. The median half-life among them is four days.

Line chart showing cumulative percentage of views earned against days since publication, for twelve posts. Most curves rise almost vertically in the first few days and then flatten. A dotted horizontal line marks the fifty percent level, which most curves cross within a week.

Trick Four: Some Metadata Is in the Markdown, Not the JSON

I write multi-part series. None of my posts came back with a collection_id, which is the field you would reach for to group them.

The series are right there in the Dev.to UI. The article serializer just does not include the field.

But /api/articles/me/published returns body_markdown, front matter and all, and the series name is sitting in it:

FRONT_MATTER_SERIES = re.compile(r"^series:\s*(.+?)\s*$", re.M)

def series_name(article):
    body = article.get("body_markdown") or ""
    if not body.lstrip().startswith("---"):
        return None
    parts = body.split("---", 2)
    if len(parts) < 3:
        return None
    match = FRONT_MATTER_SERIES.search(parts[1])
    return match.group(1).strip().strip("\"'") if match else None

General lesson: when a field you expect is absent from the JSON, check whether the source document came back too. It often did.

Line chart plotting lifetime views against part number for five article series. Every line except one descends from part one to part three, losing roughly half to two thirds of its readers.

Trick Five: Comments Arrive Pre-Threaded

/api/comments?a_id={id} returns comments as a tree, with each comment’s replies nested in children. The structure is doing analytical work for free, and flattening it while preserving depth takes about eight lines:

def flatten(nodes, depth=0):
    out = []
    for node in nodes or []:
        out.append({
            "depth": depth,
            "username": (node.get("user") or {}).get("username"),
            "created_at": node.get("created_at"),
            "text": strip_html(node.get("body_html")),
        })
        out.extend(flatten(node.get("children") or [], depth + 1))
    return out

Depth is the metric that matters. Comment count cannot distinguish eight people each saying “great article” from two people arguing with you for four rounds. Maximum thread depth can. One of my posts has a thread 35 levels deep. That is not a comment section, it is a sustained argument, and no count-based metric would have told me it happened.

Scatter plot with comment count on the horizontal axis and maximum thread depth on the vertical. Most points cluster low and left. A few outliers sit high on the vertical axis, indicating deep back-and-forth threads rather than many separate comments.

There is no endpoint for creating comments, incidentally. Replying still requires the browser. Probably deliberate.

What the Data Actually Said

Here is where the exercise stopped being a programming problem.

My follower count is not a readership number. I gained roughly 18,000 followers in 2026. My 2026 posts have 14,300 total views between them. You cannot acquire eighteen thousand followers from fourteen thousand views. The daily rate sits at a median of 136 with no meaningful response to whether I published anything, and about 37% of the usernames carry auto-generated-looking hex or numeric tails. That is reciprocal-follow farming, it is endemic, and it has nothing to do with me. It does mean the chart I originally set out to build could never have answered the question I was asking.

My most-viewed work is nine years old and no longer being read. My 2017 output was MicroPython, NodeMCU, and MongoDB tutorials. Forty-four posts from 2017 to 2019 pulled 32,474 views. Eighty-six posts in 2026 have pulled 14,300. But the daily series tells the other half: my 5,472-view NodeMCU post has had zero views in the last ninety days. Nineteen of my 130 posts are at zero for the quarter. Lifetime counters never decrease, which makes an archive look alive long after it has stopped breathing.

The engagement numbers invert completely. Those big old tutorials run about 2 reactions per thousand views. My 2026 essays run 56 to 72, with one at 71.6 reactions and 63.8 comments per thousand. Across the eras: 44 old posts drew 26 comments total. 86 new posts have drawn 606.

Scatter plot with lifetime views on a logarithmic horizontal axis and reactions per thousand views on the vertical. Older high-traffic posts sit far right and near the bottom. Newer low-traffic posts sit left and high. Red markers indicate posts with no views in the last ninety days.

So one body of work got found and skimmed. The other gets read and argued with. They are different products, and I had been evaluating both with the same number.

Four percent of my traffic is Google. Direct or unknown is 74.5%. Internal Dev.to is 19%. For someone whose best-performing historical content is evergreen reference material, that is the number I find hardest to look at.

What I Would Tell Someone Starting This

Pull the followers once and cache them, because the dates reconstruct years of history you never thought to record. Gate every analytics computation on data coverage, because a partial series will hand you a confident wrong answer rather than an error. Read thread depth instead of comment count. And check body_markdown before concluding a field does not exist.

Mostly, though: separate the metrics that measure distribution from the metrics that measure whether anyone cared. Views, follower counts, and impressions are the first kind. Comment depth, reply rates, and the fact that the same four people keep showing up in your threads are the second.

I spent nine years assuming the first kind was the scoreboard. The API took an evening to tell me otherwise.

Facebooktwitterredditlinkedinmail

Flask Blood Glucose Tracker

My oldest daughter was diagnosed with Type 1 Diabetes at the age of two. Technology has come a long way in terms of tracking blood sugar levels, but I thought I would start a Python web application to do so. I’ll be using the Flask web framework for the project and, since I’m not a marketing or product naming genius, will call the project Flask Blood Glucose Tracker. I’m certainly open to other, more catchy, names.

This is somewhat of a different post for me, in that I’ll be walking through the generation of an actual application. The application will mostly be a minimal viable product (MVP) though. It should, however, be a good tutorial on how to integrate some concepts and technologies together. As such, in this first post, I’ll cover some of the project specifications and features that I’d like to include and work on implementing them in future posts.

Application for Diabetes

Diabetics have to check their blood glucose levels frequently, typically using a blood sugar monitor. These checks involve getting a small portion of blood from a finger (or arm) prick and having the monitor test it. It then returns a measurement of the amount of glucose in the blood as a number of milligrams per deciliter (mG/dL). These readings then will be the numbers we want to record in our application.

It is also important to know if the reading is taken before or after eating and the time of day the reading was taken. Therefore, the application will need to accommodate for that as well. The readings themselves, along with the time of day and relation to meal time are all factors into the amount of insulin needs to be injected.

Throughout this, and subsequent posts, I will do my best to explain diabetes-specific terms in as user-friendly of a way as possible. I am basing much of the numbers that I use, ranges of “good and bad”, etc. on managing my daughter’s diabetes over the last 14 years and the countless doctor appointments I’ve attended. As a disclaimer, I am not a medical professional. Please check with your physician about specifics with diabetes. There is a Diabetes For Dummies book which provides a decent overview as well.

Flask Blood Glucose Tracker Application Features

There are already a lot of excellent products on the market for keeping track of one’s blood sugar levels. With that in mind, this application is going to be fairly simple to start. I would like to build it with growth in mind, however, so building a REST API into the project seems like a good idea. My basic feature list to start with is:

  • Register for the BGT site, with email confirmation.
  • Login/Logout and based on role have different access.
    • Patient to access and edit my own data.
    • Physician to get a list of all current patient records.
    • Administrator for site maintenance.
  • Input blood sugar levels with date and time of reading and indication of before or after a meal or snack.
  • Display the data in a table with averages.
  • Display the data in a chart or visual format.
  • Typical CRUD operations for the data
  • REST API to expose patient blood sugars in a secure fashion
  • Data is stored in the cloud for accessibility and ease of database maintenance.

For the reporting features highlighting high and low blood sugar levels in the report would be helpful. Since what is “good” and “bad” can change for each individual, I’ll include a field for each individual to set that.

Application Stack

I have already mentioned that this application will be built with Flask. For the data store, I will use MongoDB. To keep in line with the feature request of storing data in the cloud, MongoDB offers a Database as a Service (DBaaS) called Atlas.

I haven’t quite figured out yet where I’ll ultimately host this application, perhaps Heroku? Or maybe on my own server.

Application Libraries

When it comes to libraries, there are a lot of choices. Here’s what I’ll be using, which will also be included in a requirements.txt file.

  • Flask version 0.12.2
  • Flask-Login, 0.4.0
  • Flask-PyMongo, 0.5.1
  • Bokeh, 0.12.6
  • Jinja2, 2.9.6
  • pandas, 0.20.2

There are other libraries that will but used as well, but those are the main ones of interest.

I’m also more of a fan of Zurb Foundation than Twitter Bootstrap, so I’ll be using that for styling.

Pages and Routes

Web Pages

To start with we need a way for a user to log in, enter their personal data, enter a new blood sugar record, edit their record, and view their information in both a tabular format and then in a chart format.

We’ll need the following pages, at least to start.

  • Index
  • Registration
  • Login/Logout Page
  • Profile page, login required
  • Records page (create, read, update, delete), login required
  • Chart page, login required

For a Physician we would want to be able to:

  • Display all of their patients, login required

For an Administrator, we want to be able to

  • Have the ability to manage users (patients & physicians) but not be able to see patient medical data.
REST API Routes

From the API I want to expose the ability to securely read and write (GET and POST) data to a patient’s record. This will make it easier to, for example, write a mobile application to connect to our data. Or, with the advances in blood sugar monitors, perhaps automatically update our application with readings from a device.

Document Model

Since I will be using MongoDB to store data for this application, I’ll be leveraging the document model. This offers a lot of flexibility in how data is stored, among other benefits. I would encourage you to read my blog post on the document model if you are not familiar with it.

To start with, the basic data we want to capture and model will be as follows:

BGT Sample Document
Sample Patient Record document

In looking at this sample document, the groups field will keep track of values such as patient, physician, and admin. I have chosen to implement the postal_code and MRN values as strings instead of integers to accommodate alpha-numeric values.

Through the course of developing this application, we will see the flexibility of the document model in action. We’ll see how we can utilize some of the features from MongoDB’s aggregation pipeline to handle our data processing as well.

Wrap Up

I have outlined a nice project here which will utilize several different bits of programming. In the next few posts then, I’ll cover how to implement all of these features into an MVP application. I would definitely enjoy receiving feedback, so please leave comments below.

 


Follow me on Twitter @kenwalger to get the latest updates on my postings.

Facebooktwitterredditlinkedinmail