env-serve
v1.0.3
Published
HTTP(S) server for static files with dynamic config from env vars
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env-serve
HTTP(S) server for static files with dynamic config from env vars
Examples
### install
npm i -g env-serve
# for help
env-serve --help
# run simple server
env-serve
# change port and entry file
env-serve -p 3003 -f foo_bar.html
# run https server with selfsigned certs
env-serve -s -p 3003 -f index.html
# run server and change coanfig basing on env vars
EXPORT MY_TEST_VAL="My test value"; env-serve -f index.html
# change file type from html to js, now config.js should contains window.appConfig variable
env-serve -f config.js
# change default global config var name, now you should rename appConfig to fooBar
env-serve -g fooBarHow it works?
Let's say you have an index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>My test page</title>
<script>
window.appConfig = {
"MY_TEST_VAL": "Hello world",
"MY_TEST_VAL_2": 123
};
</script>
</head>
<body>
<h2>Application config:</h2>
<pre></pre>
<script>
const c = document.querySelector('pre');
c.innerText = JSON.stringify(window.appConfig, null, 4);
</script>
</body>
</html>now you can control variables in window.appConfig on server start. For example:
EXPORT MY_TEST_VAL="My test value"; env-serve -f index.htmlServer runs on port 3000 with changed configuration, instead of Hello world
you should see My test value.
Use case
It's helpful when you need to run several variants of your app and some parameters needs to be passed on runtime.
It could be especially useful when mixed with docker, then you can do something like:
docker run -p 3000:3000 -e MY_TEST_VAL="Foo bar" frontend:latest
Thanks this you don't need to rebuild whole docker image with app to change your application behaviour
Example Dockerfile for above example
FROM node:12
ENV MY_TEST_VAL ''
COPY . /app/
WORKDIR /app
RUN npm install
RUN npm install -g env-serve
RUN npm run build
EXPOSE 3000
WORKDIR /app/build
CMD ["env-serve"]Known problems
- I can't quit from my docker when env-serve is set to entrypoint - add
--initflag to yourdocker runit prevents env-serve process from stealing PID 1 and helps with proper signal handling
Help output:
Usage: env-serve [options]
Options:
-V, --version output the version number
-v, --version output the version number
-g, --global [globalName] global variable name eg. window.yourName (default: "appConfig")
-c, --cert [pathToCert] path to cert file
-C, --ca [pathToCa] path to ca file
-S, --https [pathToCa] is https mode (default: false)
-k, --cert-key [pathToCertKey] path to cert key file
-p, --port [port] port (default: 3000)
-f, --config-file [configFile] file where config exists (default: "index.html")
-s, --self-signed [selfSigned] generate self signed certificate for server
-h, --help output usage information