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doc/examples/njs/README.md

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+# print env via NJS
+
+consult [Dockerfile](Dockerfile) or [docker-compose.yml](docker-compose.yml) - both are simple and fine enough.
+
+---
+
+configuration:
+
+```nginx
+server {
+    listen 8080;
+
+    location / { return 204; }
+
+    js_import ngx_env.js;
+    location = /env
+    {
+        js_content ngx_env.report;
+    }
+}
+```
+
+---
+
+NJS script:
+
+```js
+function report(r) {
+    var s = "";
+    const keys = Object.keys(process.env).sort();
+    for (const i in keys) {
+        const k = keys[i];
+        const v = process.env[k];
+        s += k + '=' + v + "\n";
+    }
+    r.return(200, s);
+}
+
+export default { report };
+```
+
+---
+
+Test URI e.g. with `curl`:
+```sh
+curl http://127.0.0.1:8080/env
+```