A coding journal that writes itself from your commits

You solved a tricky bug six months ago. You remember that much. It had something to do with race conditions in the webhook handler, or maybe the queue processor. You spent two days on it. The fix was elegant, or at least you thought so at the time.

Now the same class of bug has appeared in a different service, and you cannot remember how you fixed the first one.

You check the commit history. There it is: fix: resolve race condition in webhook retry logic. The message tells you what changed. It does not tell you why that approach worked, what you tried first, or how you arrived at the solution. The git log is a record of outcomes, not a record of the process that produced them.

This is the gap a coding journal is supposed to fill. Developers have tried many formats to close it. Most of them share the same failure mode.

The formats developers have tried

The idea of keeping a developer journal is not new. The community has invented several approaches, each with real strengths, and each with the same fatal weakness.

TIL repositories. Joshua Branchaud has maintained a public TIL (Today I Learned) repository on GitHub for over five years, posting short notes about technical discoveries. The format is excellent for isolated facts (“PostgreSQL advisory locks behave differently inside transactions”), but it only captures what you chose to write down. The debugging session that taught you the lesson, the three wrong approaches you tried first, the PR discussion that pointed you in the right direction: none of that makes it into a TIL entry, because you would have to reconstruct the narrative yourself.

Brag documents. Julia Evans popularized the brag document: a running list of your accomplishments, updated every two weeks or at performance review time. It solves a real problem (“wait, what did I do in the last 6 months?”), and Evans notes that she always ends up finding things she completely forgot by digging through pull requests and tickets. But that digging is the hard part. The brag document is a downstream artifact of manual reconstruction. If you do not sit down and search through your history, it stays empty.

DEV Community #devjournal. The #devjournal tag on DEV has hundreds of posts, ranging from “Day 24 of My Automation Journey” to weekly learning roundups. The submission guidelines encourage writing about your own journey: what you tried, accomplished, and learned. Scroll through the archive, though, and you see the pattern. Entries are enthusiastic for the first few weeks. Then the gaps between posts grow longer. Then they stop. The person kept coding. The journal did not keep up.

Obsidian daily notes. Some developers maintain a daily note in Obsidian with a coding section. The template might include headings like “What I worked on,” “Decisions made,” and “Blockers.” The tool is powerful, the backlinks are useful, and the local-first approach appeals to privacy-conscious engineers. But every bullet point under those headings requires you to type it. At the end of a long day of writing code, writing about writing code is the last thing most people do.

Notion engineering templates. Notion’s template gallery includes coding journal templates with databases, kanban boards, and linked entries. The initial setup is satisfying. Six weeks later, the database has three rows and the template is archived.

Every format fails in the same place: the moment where a tired developer has to switch from coding to writing about coding. The friction is not in the tool. It is in the transition.

What makes a coding journal worth reading later

Before solving the friction problem, it helps to know what a good coding journal actually contains. It is not a reformatted commit log.

The arc of a problem. You opened an issue on Monday, spent Tuesday investigating, pushed a partial fix on Wednesday, then rewrote the approach on Thursday after a code review suggested a simpler path. Four days, one story. The commit history shows four separate events in four separate timelines. A journal connects them.

Decisions and trade-offs. You chose a queue over a cron job. You refactored the data layer before adding the feature, because the old structure would have doubled the complexity. These choices are invisible in the diff but essential when someone asks “why is it built this way?” six months later.

Lessons that evaporate. That the CI cache was causing false positives in integration tests. That a particular third-party API silently drops headers over 8KB. These facts appear once, get applied, and vanish from memory. A journal holds them in place.

The texture of how you work. Three code reviews before lunch. A long debugging session after a one-on-one. A late commit after the serialization problem finally clicked. Not just what you produced, but the shape of the day that produced it.

Julia Evans’s brag document template includes a “What you learned” section for exactly this reason: skills and knowledge you acquire fade from awareness quickly. A coding journal makes that learning persistent and searchable.

Your commits already narrate most of this

The irony is that developers create more written artifacts during a workday than almost any other profession. Every merge request has a description. Every code review has comments. Every bug report has a thread. Design documents, architectural decision records, Slack debates about naming conventions. The exhaust is everywhere.

swyx’s “Learn in Public” essay captures this well: the fastest way to learn is to create “learning exhaust” as you go. Developers already produce enormous amounts of this exhaust. It just lives scattered across version control, organized by project rather than by day. Your Tuesday exists as fragments in three separate timelines. No view stitches them into a continuous narrative of what you actually worked on.

All the ingredients for a coding journal are already written. What is missing is the assembly step: something that reads across repositories, orders the fragments chronologically, and turns them into prose.

An automatic coding journal

deariary connects to GitHub and reads the artifacts your workday already generated. Each morning, it turns the previous day into readable prose.

Tuesday, April 8

Most of the day went toward the notification service migration. Three commits moved the email queue from Redis to a dedicated message broker. The first attempt used a fanout exchange, but after reviewing throughput numbers you switched to a direct exchange with per-user routing keys, which cut delivery latency by half.

In between, you reviewed the frontend PR for the notification preferences panel, flagging an issue with toggle state persistence and suggesting a debounce on the save call.

Closed the month-old “notifications delayed by 5+ minutes” issue, linking it to the migration PR as the root cause fix.

That reads like something you would write in a brag document, except you did not write it. Your commits, the PR conversation, and the issue thread did.

Adding the non-code layers

Code is the core of a developer’s day, but seldom the whole day. Connect Todoist and the journal captures which tasks you completed and which slipped to tomorrow. Connect Slack and it captures the architecture discussion that led to your afternoon refactor. Connect Google Calendar and the long gap between your standup and your first commit becomes legible: you were in a design review and a one-on-one.

The coding journal stops being a code-only record and becomes a developer’s full day: the meetings, the planning, the conversations, and the code they shaped.

The brag document that writes itself

One practical benefit: your deariary journal doubles as an always-current brag document. When performance review arrives, you do not need to spend an afternoon digging through pull requests and tickets the way Evans describes. The entries are already there, organized by date, with the context that makes each accomplishment legible.

Search for “migration” and find every day you worked on that project, with the decisions and trade-offs inline. Search for “code review” and see the pattern of your collaboration across months. The “What you learned” section that Evans recommends filling in manually is already embedded in the entries: every new library you used, every edge case you discovered, every workaround you found.

Reading your entries back

The value of a coding journal compounds over time.

Technical memory. That caching strategy you implemented in February. The workaround for the rate limit on the payments API. The database index that cut query time from 800ms to 12ms. Each of these lives in a searchable diary entry with more context than a commit message ever provides.

Work rhythm awareness. After a month of entries, you notice that your deepest coding sessions fall on the days your calendar is lightest. Midweek days tend toward reviews and pair programming. Fridays are planning and cleanup. You never chose this schedule. It appeared in the record on its own.

Growth you can read. Entries from six months ago look different from last week’s. The problems that frustrated you then are routine now. The architectural patterns you reach for have evolved. A coding journal makes this progression concrete, not an abstract sense of improvement but a timeline you can scroll through.

No second writing session required

The TIL repos, brag documents, #devjournal posts, Obsidian notes, and Notion templates all share the same bottleneck: they require a second writing session at the end of a day already filled with writing. You wrote code. You wrote commit messages. You wrote PR descriptions. You wrote review comments. The journal asks you to write again, about the writing you already did.

An automatic coding journal removes that second session entirely. The writing you produced during work, in the tools where you already work, becomes the journal. No blank page waiting at the end of the day. No weekly ritual to protect. No guilt when you skip it, because there is nothing to skip.

Set up GitHub in your deariary account and the first entry arrives the next morning. Your commits, reviews, and discussions from today become the opening page.

The difficult work is already done. You wrote the code.