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10.0.1 • Public • Published


Configure an angular application at runtime on the server or in a docker container via environment variables.


The Angular CLI provides build time configuration (via environment.ts). In a Continuous Delivery environment this is sometimes not enough.

How it works

Environment variables are used for configuration. This package provides an Angular CLI builder to search for usages at build time. A native CLI can be used to insert populated environment variables into index.html file(s) into the head tag or by replacing <!--CONFIG--> (Missing environment variables will be represented by null). This should be done on the host serving the bundled angular files.

Version 8/9 Changes

Version 8.x of this package was a complete rewrite with Angular schematics and builders. If you require support for older Angular versions, Version 2.x of this library can be used, as it is Angular version agnostic.

Version 9 of angular-server-side-configuration deprecates aotSupport, since it is no longer required for Angular 9 with Ivy. The update schematic removes the option from your angular.json.

Getting Started

ng add angular-server-side-configuration

or, if you have a previous version of this library installed

ng update angular-server-side-configuration@latest

This will configure the appropriate files.

Alternatively, if you want to configure the files yourself:

npm install --save angular-server-side-configuration


Ensure you have an ngsscbuild entry in your project architect section. To use the builder run ng run your-project-name:ngsscbuild:production. You can add additional configurations in angular.json, which can be executed by replacing production with your configuration name in the previous command.

The builder will analyze the configured ngsscEnvironmentFile to detect used environment variables and generate an ngssc.json in the defined outputPath in the referenced browserTarget.

    "your-project-name": {
      "architect": {
        "ngsscbuild": {
          "builder": "angular-server-side-configuration:ngsscbuild",
          "options": {
            "additionalEnvironmentVariables": ["MANUAL_ENTRIES"],
            "browserTarget": "your-project-name:build",
            "ngsscEnvironmentFile": "src/environments/environment.prod.ts",
            // Optional 
            // (Defaults to the basename of the index option of the browser target)
            "filePattern": "index.html"
          "configurations": {
            "production": {
              "browserTarget": "your-project-name:build:production"

To run the ngssc build, run the command ng run your-project-name:ngsscbuild:production.


angular-server-side-configuration supports two variants for using environment variables: process.env.* or NG_ENV.*


Use process.env.NAME in your environment.prod.ts, where NAME is the environment variable that should be used.

import 'angular-server-side-configuration/process';
export const environment = {
  production: process.env.PROD !== 'false',
  apiAddress: process.env.API_ADDRESS || 'https://example-api.com'


Import NG_ENV from angular-server-side-configuration/ng-env and use NG_ENV.NAME in your environment.prod.ts, where NAME is the environment variable that should be used.

import { NG_ENV } from 'angular-server-side-configuration/ng-env';
export const environment = {
  production: NG_ENV.PROD !== 'false',
  apiAddress: NG_ENV.API_ADDRESS || 'https://example-api.com'

index.html (Optional)

Add <!--CONFIG--> to index.html. This will be replaced by the configuration script tag. This is optional, as the environment variables can be configured to be inserted in the head tag. It is however the safest option.

<!doctype html>
<html lang="en">
  <meta charset="utf-8">
  <title>Angular Example</title>
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">

On host server or in Dockerfile

This library provides a Node.js and a native implementation for inserting the environment variables into your html. Either the insert function from the package (import { insert } from 'angular-server-side-configuration';) or the insert command of the CLI. For the native CLI, go to Releases and download the appropriate executable for your server environment. (See build.sh for build details of the native CLI. Please open an Issue if you need an additional environment.)

Thanks to DanielHabenicht for the input and contribution.

ngssc insert

Usage: ngssc insert [options] [directory]

Options Description
-r, --recursive Recursively searches for ngssc.json files and applies the contained configuration
--dry Perform the insert without actually inserting the variables
Minimal Example


FROM nginx:alpine
ADD https://github.com/kyubisation/angular-server-side-configuration/releases/download/v9.0.1/ngssc_64bit /usr/sbin/ngssc
RUN chmod +x /usr/sbin/ngssc
COPY dist /usr/share/nginx/html
COPY start.sh start.sh
RUN chmod +x ./start.sh
CMD ["./start.sh"]


ngssc insert /usr/share/nginx/html
nginx -g 'daemon off;'


The ngssc.json will be generated by the ngsscbuild builder.

  "variant": "process",           // Either "process" or "NG_ENV".
  "environmentVariables": [],     // Detected environment variables.
  "filePattern": "**/index.html"  // File pattern in which environment variables should be inserted.


Apache License, Version 2.0


npm i angular-server-side-configuration

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