diff --git a/README.md b/README.md
index 0ae86f6..e6ad2f5 100644
--- a/README.md
+++ b/README.md
@@ -10,11 +10,21 @@ Design principals:
 * Useful default behaviors when not specified
 * Be fun to use
 
-Note!  Although cwl-ex tool already offers a lot of functionality, the
-error reporting still needs a lot of work.  If you are trying to use
-it and running into problems, please file an issue.
+# Quickstart using Docker
 
-# Installation:
+Build a self-contained script (no imports)
+
+```
+cwl-runner cwlex.cwl --inp myscript.cwlex
+```
+
+Build script with imports:
+
+```
+cwl-runner cwlex.cwl --inpdir . --inpfile myscript.cwlex
+```
+
+# Installing
 
 ```
 npm install cwl-ex
@@ -235,20 +245,30 @@ def workflow main(v1="hello", v2="world") {
 Generate the parser (requires antlr4):
 
 ```
-$ cwl-runner antlr.cwl
+$ cd src && cwl-runner antlr.cwl
 ```
 
-Install dependencies (requires node.js and npm):
-
+Run local code in Docker
 ```
-$ npm install
+cwl-runner cwlex.cwl --inp src/cwlex-dev.cwlex
+cwl-runner cwlex-dev.cwl --inp myscript.cwlex
 ```
 
 Run tests:
 
 ```
-$ ./cwlex.js cwlex-tests.cwlex > cwlex-tests.cwl
+$ cwl-runner cwlex.cwl --inpdir . --inpfile cwlex-tests.cwlex
 $ cwl-runner cwlex-tests.cwl
 ```
 
-TODO: Create Docker image with antlr4, nodejs and dependencies.
\ No newline at end of file
+Install dependencies (requires node.js and npm):
+
+```
+$ npm install
+```
+
+Generate Docker image
+```
+npm pack
+docker build -f cwlex.Dockerfile .
+```
diff --git a/README.md.tmpl b/README.md.tmpl
index 77e9f02..a58ff60 100644
--- a/README.md.tmpl
+++ b/README.md.tmpl
@@ -10,11 +10,21 @@ Design principals:
 * Useful default behaviors when not specified
 * Be fun to use
 
-Note!  Although cwl-ex tool already offers a lot of functionality, the
-error reporting still needs a lot of work.  If you are trying to use
-it and running into problems, please file an issue.
+# Quickstart using Docker
 
-# Installation:
+Build a self-contained script (no imports)
+
+```
+cwl-runner cwlex.cwl --inp myscript.cwlex
+```
+
+Build script with imports:
+
+```
+cwl-runner cwlex.cwl --inpdir . --inpfile myscript.cwlex
+```
+
+# Installing
 
 ```
 npm install cwl-ex
@@ -159,20 +169,30 @@ $include: ex14.cwlex
 Generate the parser (requires antlr4):
 
 ```
-$ cwl-runner antlr.cwl
+$ cd src && cwl-runner antlr.cwl
 ```
 
-Install dependencies (requires node.js and npm):
-
+Run local code in Docker
 ```
-$ npm install
+cwl-runner cwlex.cwl --inp src/cwlex-dev.cwlex
+cwl-runner cwlex-dev.cwl --inp myscript.cwlex
 ```
 
 Run tests:
 
 ```
-$ ./cwlex.js cwlex-tests.cwlex > cwlex-tests.cwl
+$ cwl-runner cwlex.cwl --inpdir . --inpfile cwlex-tests.cwlex
 $ cwl-runner cwlex-tests.cwl
 ```
 
-TODO: Create Docker image with antlr4, nodejs and dependencies.
\ No newline at end of file
+Install dependencies (requires node.js and npm):
+
+```
+$ npm install
+```
+
+Generate Docker image
+```
+npm pack
+docker build -f cwlex.Dockerfile .
+```
diff --git a/cwlex-tests.cwlex b/cwlex-tests.cwlex
index 0a40ac6..f698298 100644
--- a/cwlex-tests.cwlex
+++ b/cwlex-tests.cwlex
@@ -1,4 +1,4 @@
-import "cwlex.cwlex" as cwlex
+import "src/cwlex.cwlex" as cwlex
 
 def workflow main(
  cases = [
diff --git a/cwlex.Dockerfile b/cwlex.Dockerfile
new file mode 100644
index 0000000..ef18edd
--- /dev/null
+++ b/cwlex.Dockerfile
@@ -0,0 +1,5 @@
+from node:slim
+
+COPY cwl-ex-1.0.0.tgz /root
+
+RUN npm install --global /root/cwl-ex-1.0.0.tgz
diff --git a/src/cwlex.cwlex b/src/cwlex.cwlex
index 3e81d0f..5be5605 100644
--- a/src/cwlex.cwlex
+++ b/src/cwlex.cwlex
@@ -1,26 +1,17 @@
 def tool main(
-    cwlex = File("cwlex.js", "cwlex-convert.js", "cwlexLexer.js", "cwlexListener.js", "cwlexParser.js"),
-    node_modules = Directory("node_modules"),
     inp? File,
     inpdir? Directory,
     inpfile? string,
     outname? string)
 {
    requirements {
-      InitialWorkDirRequirement {
-        listing: [{
-          entry: "$(inputs.node_modules)"
-         }, {
-          entry: "$(inputs.cwlex)"
-        }]
-      }
-      DockerRequirement { dockerPull: "node:slim" }
+      DockerRequirement { dockerPull: "commonworkflowlanguage/cwlex" }
       InlineJavascriptRequirement { expressionLib: ["
 function outname(inputs) {
   return inputs.outname ? inputs.outname : (inputs.inp ? inputs.inp.nameroot+'.cwl' : inputs.inpfile.replace(/(.*)\.cwlex/, '$1.cwl'));
 }
 "]}
    }
-   nodejs $(inputs.cwlex) "$(inputs.inp ? inputs.inp.path : inputs.inpdir.path+'/'+inputs.inpfile)" > "$(outname(inputs))"
+   cwlex "$(inputs.inp ? inputs.inp.path : inputs.inpdir.path+'/'+inputs.inpfile)" > "$(outname(inputs))"
    return File(outname(inputs)) as converted
 }
\ No newline at end of file