Supported data types in Firebase - Step-by-Step Execution

Process Flow - Supported data types

Start: Define Data

↓

Check Data Type

↓

String

↓

Store in DB

↓

Retrieve & Use

↓

End

Data is defined, its type is checked among supported types, then stored and retrieved from Firebase.

Execution Sample

Firebase

docRef.set({
  name: "Alice",
  age: 30,
  isMember: true
});

Stores a document with string, number, and boolean data types in Firebase.

Process Table

Step	Data Field	Value	Detected Type	Action
1	name	"Alice"	String	Store as string
2	age	30	Number	Store as number
3	isMember	true	Boolean	Store as boolean
4	All fields	N/A	N/A	Document stored successfully
5	Retrieve	N/A	N/A	Data retrieved with original types

💡 All supported data types stored and retrieved correctly.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
name	undefined	"Alice"	"Alice"	"Alice"	"Alice"
age	undefined	undefined	30	30	30
isMember	undefined	undefined	undefined	true	true

Key Moments - 2 Insights

Why does Firebase store numbers without quotes but strings with quotes?

Because Firebase detects the data type by the value format: quotes mean string, no quotes with digits mean number, as shown in execution_table steps 1 and 2.

Can I store a boolean value as a string to represent true/false?

You can, but Firebase treats it as a string, not a boolean. See execution_table step 3 where true is stored as a boolean, not a string.

Visual Quiz - 3 Questions

Look at the execution table, what type is the 'age' field detected as at step 2?

A String

B Number

C Boolean

D Undefined

💡 Hint

Check the 'Detected Type' column for step 2 in the execution_table.

At which step is the boolean value stored in Firebase?

A Step 3

B Step 2

C Step 1

D Step 4

💡 Hint

Look for the 'isMember' field in the execution_table.

If you changed the 'age' value to "30" (with quotes), how would the detected type change?

A It would remain Number

B It would become Boolean

C It would become String

D It would be Undefined

💡 Hint

Refer to how quotes affect type detection in execution_table steps 1 and 2.

Concept Snapshot

Firebase supports these data types:
- String: text in quotes
- Number: digits without quotes
- Boolean: true or false
Store data by type; Firebase keeps types on retrieval.
Use correct types to avoid errors.

Full Transcript

In Firebase, data is stored with clear types: strings, numbers, and booleans. When you save a document, Firebase checks each field's value to detect its type. For example, text inside quotes is a string, digits without quotes are numbers, and true/false are booleans. This ensures data is stored correctly and can be retrieved with the same type. The example shows storing a name as a string, age as a number, and membership status as a boolean. Understanding these types helps avoid confusion and errors when working with Firebase data.