Nest.js Config

• Nest.js Config
  • The Environment Variable Loading Process
  • How to add environment variables?
    • Local Environment
    • Testing Environment
    • Online Environment
  • Reference

The Environment Variable Loading Process

• compose step: raw environment variables will be composed to provide some default value and generate multiple level of derivative env variables.
• transform step: env vars will be transformed to defined types automatically and undefined env variables will be stripped.
• validation step: loaded environment variables will be validated against the schema

How to add environment variables?

Local Environment

• add environment variables in .env.local
• add default values or derivatives in config/compose.ts
• add validation rules in config/envs.ts

Testing Environment

If the env var already exist in .env.local

• override the value in .env.test

If the env var doesn't exist in .env.local

• do this same step in Local Environment
• override the value in .env.test

Online Environment

Online Environments includes DEV, QA, SANDBOX, PRODUCT

If the env var already exist in .env.local

• override the var in online environment. e.g., set env in lambda function

If the env var doesn't exist in .env.local

• do the same step in Local Environment
• override the var in online environment. e.g., set env in lambda function

Reference

• Nest.js Configuration