The Hidden Cost of Global State: Why Everything Doesn’t Belong in Your Store
One Store To Rule Them All
The Hidden Cost of Global State: Why Everything Doesn’t Belong in Your Store
One Store To Rule Them All
When teams first adopt state management, something interesting happens.
The store becomes the answer to every problem.
Need a loading flag?
Put it in the store.
Need a selected customer?
Store.
Search text?
Store.
Dialog visibility?
Store.
Current tab?
Store.
Notification?
Store.
Soon the store knows everything about the application.
It feels centralized.
It also becomes incredibly difficult to evolve.
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Global Doesn’t Mean Important
One of the biggest architectural mistakes is confusing:
Important data
with
Global data.
These are not the same thing.
A customer profile may be critical to the business.
That doesn’t automatically mean every feature should own or observe it.
Importance does not determine scope.
Ownership does.
Local State Is Often Better
Imagine a search box inside the Customer page.
Only that page needs:
- Search text
- Current filter
- Selected row
- Expanded panel
- Sort order
Why should the entire application know these values?
It shouldn’t.
Keeping state local reduces complexity.
Every Global State Has A Cost
Global state seems convenient.
Until dozens of features start reading it.
Then updating it.
Then depending on it.
Now a small change requires understanding multiple teams, workflows, and screens.
The architecture becomes tightly coupled — not because of Angular, but because of shared ownership.
Ask One Simple Question
Before adding something to the global store, ask:
Who needs this state?
If the answer is:
“This page.”
Keep it local.
If the answer is:
“This feature.”
Keep it inside the feature.
Only when multiple independent features truly depend on the same state should you consider making it global.
A Layered View Of State
Think of Angular state in layers.
Component State
Lives inside one component.
Examples:
- Dialog open/close
- Active tab
- Form progress
- Hover state
Feature State
Shared within one business capability.
Examples:
- Selected customer
- Customer list
- Customer filters
- Customer permissions
Owned by the Customer feature.
Application State
Shared across independent features.
Examples:
- Logged-in user
- Current organization
- Theme
- Language
- Authentication status
Only a small percentage of application state belongs here.
Bigger Store ≠ Better Architecture
Some projects proudly say:
“Everything is in NgRx.”
Or:
“Everything is in Signal Store.”
That isn’t necessarily a success.
A huge store often means unclear ownership.
Good architecture isn’t measured by how much state is centralized.
It’s measured by how well responsibilities are separated.
Signals Don’t Change This Principle
Signals make state updates simpler.
Signal Store makes state organization cleaner.
But neither changes the fundamental question.
Who owns this data?
Architecture still comes before tooling.
The Cost Of Unnecessary Global State
Over time you begin to notice symptoms.
- Components listening to unrelated state
- Features reacting to changes they don’t own
- Difficult debugging
- Unexpected side effects
- Fear of modifying state
These are ownership problems disguised as state problems.
Think Like A City
Not every road needs to be a national highway.
Most roads are local.
Some connect neighborhoods.
Only a few connect the entire country.
State should follow the same principle.
Keep it as local as possible.
Promote it only when necessary.
A Practical Rule
Whenever you create new state, ask yourself:
Can this stay local for now?
If the answer is yes…
Leave it there.
Promoting state is easy later.
Pulling unnecessary global state back into features is much harder.
Final Thoughts
Global state is one of Angular’s most valuable tools.
It’s also one of the easiest to overuse.
The strongest Angular architectures don’t centralize everything.
They centralize only what truly belongs at the application level.
Everything else stays close to the feature that owns it.
Because software scales best when responsibility stays local.
Not when every piece of information becomes everyone’s concern.
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