WEBVTT

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How can the same code use different service settings?

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Environment variables provide named configuration values to a process.

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Understand the setting and its scope.
6 environment-variable basics.

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A variable has a name and value
The application reads the named setting when it needs it.
Setting name · Configured value · Application use

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Environments can differ
A test environment can use different values from production.
Local development · Preview settings · Production settings

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Check when the value is read
A value may be used during a build or while the application runs.
Build-time use · Runtime use · Framework behaviour

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Some values are sensitive
Tokens and credentials need protected storage and restricted access.
Private credentials · Protected storage · Limited access

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Browser values are public
A value included in downloaded website code can be inspected.
Browser bundle · Visible configuration · No private secrets

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Check how changes take effect
Follow the platform process and test the updated deployment.
Correct environment · Required rebuild · Verified behaviour

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Your checklist
A variable has a name and value · Environments can differ · Check when the value is read · Some values are sensitive · Browser values are public · Check how changes take effect

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Know which settings are public and which must stay private.
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