Posts
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Clojurists Together Update: September and October 2026
Time for another bi-monthly update on the work that Clojurists Together are funding this year - my maintenance of nREPL, CIDER and friends. You can find the previous one here.
For a change, most of my focus in September and October was on nREPL itself, not on CIDER. The big themes were the nREPL protocol spec and how well the servers and clients out there actually stick to it. For years building an nREPL server or client that plays well with the rest of the ecosystem came down to trial and error, and this time I finally did something about it. It paid off much sooner than I expected.
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proof: How Strong Is Your nREPL?
For as long as I’ve been involved with nREPL, the question I’ve heard most often from people building servers and clients has been some variation of “Will this work with CIDER?”. And for just as long the honest answer was “Try it and see”. Today I have a better answer for you - proof, a compatibility suite for nREPL servers (and clients). I’ve been working on it since the end of September and proof 0.2 came out a couple of days ago, so I guess it’s high time I told you a bit about it.
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neorepl 0.5: CIDER in a Terminal
neorepl 0.5 is out! When I announced neorepl last month, I wrote that I’d always wanted a terminal REPL that felt like CIDER, without the Emacs part. A few releases later I think neorepl is mostly there, so this one went out with “CIDER in a terminal” for a tagline. It also has everything from the “What’s next” list in the 0.4 post, which almost never happens with my plans.
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nREPL, Right in Your Browser
Last week nrepl.org got a makeover. The docs moved to docs.nrepl.org, and nrepl.org itself became a landing page that explains what nREPL is and how its protocol works, with “wire windows” showing real exchanges between a client and a server, as EDN or as the bencode that actually goes over the wire. Reading about a protocol only gets you so far, though, so the page now also has a “Try it” section with a real nREPL server running right in your browser. There’s one in this post as well! In the rest of it I’ll tell you how it came about, why it was harder than it looks, and how you can use the server behind it for your own projects.
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neorepl 0.4: Tests, Inspector, Tracing and Agents
neorepl 0.4 came out last week, and since I never got around to writing about 0.2 and 0.3, it feels like a good moment to look back at what happened since the original announcement. Three releases in two weeks, and neorepl now has most of what I listed under “What’s next” back then - a test runner, a full-screen inspector and stacktrace browser, an MCP server and a skill for coding agents - plus a few things that weren’t on the list at all, like tracing and peeking into your coding agent’s REPL session.
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