diff --git a/.github/workflows/daily.yml b/.github/workflows/daily.yml
index 1a7075a1f..1e259799c 100644
--- a/.github/workflows/daily.yml
+++ b/.github/workflows/daily.yml
@@ -25,3 +25,34 @@ jobs:
         with:
           name: d2chaos
           path: ./d2chaos/out
+  npm-nightly:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0  # Needed for git history and version tags
+
+      - name: Check for changes
+        id: check_changes
+        run: |
+          if [ $(git rev-list --count --since="24 hours ago" HEAD) -gt 0 ]; then
+            echo "has_changes=true" >> $GITHUB_OUTPUT
+            echo "Found changes in the last 24 hours, proceeding to publish d2js nightly"
+          else
+            echo "has_changes=false" >> $GITHUB_OUTPUT
+            echo "No changes in the last 24 hours, skipping d2js nightly publish"
+          fi
+
+      - uses: actions/setup-go@v4
+        if: steps.check_changes.outputs.has_changes == 'true'
+        with:
+          go-version-file: ./go.mod
+          cache: true
+
+      - name: Publish nightly version to NPM
+        if: steps.check_changes.outputs.has_changes == 'true'
+        run: COLOR=1 PUBLISH=1 ./make.sh js
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets._GITHUB_TOKEN }}
+          DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
diff --git a/d2js/js/README.md b/d2js/js/README.md
index 55cb9e159..76f0132f3 100644
--- a/d2js/js/README.md
+++ b/d2js/js/README.md
@@ -29,6 +29,16 @@ pnpm add @terrastruct/d2
 bun add @terrastruct/d2
 ```
 
+### Nightly
+
+Use the `@nightly` tag to get the version that is built by daily CI on the master branch.
+
+For example,
+
+```bash
+yarn add @terrastruct/d2@nightly
+```
+
 ## Usage
 
 D2.js uses webworkers to call a WASM file.
@@ -162,6 +172,16 @@ You can browse the examples by running the dev server:
 
 Visit `http://localhost:3000` to see the example page.
 
+### Publishing
+
+TODO stable release publishing.
+
+Nightly builds are automated by CI by running:
+
+```bash
+PUBLISH=1 ./make.sh build
+```
+
 ## Contributing
 
 Contributions are welcome!
diff --git a/d2js/js/ci/build.sh b/d2js/js/ci/build.sh
index f081d8e4f..3d78c0433 100755
--- a/d2js/js/ci/build.sh
+++ b/d2js/js/ci/build.sh
@@ -17,3 +17,33 @@ fi
 
 cd d2js/js
 sh_c bun build.js
+
+if [ "${PUBLISH:-0}" = "1" ]; then
+  echo "Publishing nightly version to NPM..."
+
+  DATE_TAG=$(date +'%Y%m%d')
+  COMMIT_SHORT=$(git rev-parse --short HEAD)
+  CURRENT_VERSION=$(node -p "require('./package.json').version")
+  NIGHTLY_VERSION="${CURRENT_VERSION}-nightly.${DATE_TAG}.${COMMIT_SHORT}"
+
+  cp package.json package.json.bak
+  trap 'rm -f .npmrc; mv package.json.bak package.json' EXIT
+
+  echo "Updating package version to ${NIGHTLY_VERSION}"
+  npm version "${NIGHTLY_VERSION}" --no-git-tag-version
+
+  echo "Publishing to npm with tag 'nightly'..."
+  if [ -n "${NPM_TOKEN-}" ]; then
+    echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > .npmrc
+    trap 'rm -f .npmrc' EXIT
+    if npm publish --tag nightly; then
+      echo "Successfully published @terrastruct/d2@${NIGHTLY_VERSION} to npm with tag 'nightly'"
+    else
+      echoerr "Failed to publish package to npm"
+      exit 1
+    fi
+  else
+    echoerr "NPM_TOKEN environment variable is required for publishing to npm"
+    exit 1
+  fi
+fi
diff --git a/d2js/js/package.json b/d2js/js/package.json
index a876c24be..4775805e0 100644
--- a/d2js/js/package.json
+++ b/d2js/js/package.json
@@ -2,7 +2,7 @@
   "name": "@terrastruct/d2",
   "author": "Terrastruct, Inc.",
   "description": "D2.js is a wrapper around the WASM build of D2, the modern text-to-diagram language.",
-  "version": "0.1.21",
+  "version": "0.1.22",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/terrastruct/d2.git",
@@ -41,7 +41,7 @@
     "test:integration": "bun test test/integration",
     "test:all": "bun run test && bun run test:integration",
     "dev": "bun --watch dev-server.js",
-    "prepublishOnly": "./make.sh all"
+    "prepublishOnly": "PUBLISH=0 ./make.sh all"
   },
   "keywords": [
     "d2",