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Replacer & Reviver

Transform data during JSON.stringify() and JSON.parse()

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Transform During Conversion

Replacer filters/transforms values during stringify. Reviver transforms values during parse. Perfect for handling dates, excluding sensitive data, or custom serialization.

Replacer Function

Transform values during JSON.stringify()

javascript

code

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Console Output

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Replacer Array

Whitelist specific properties

javascript

code

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Console Output

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Reviver Function

Transform values during JSON.parse()

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Real-World Example: Date Handling

Proper date serialization and deserialization

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Sanitize Sensitive Data

Remove passwords, tokens, and private fields

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Custom Class Serialization

Handle custom objects properly

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

When to Use

Replacer (stringify)

• Exclude sensitive data
• Filter properties
• Transform dates/objects
• Custom serialization

Reviver (parse)

• Convert date strings to Date
• Parse string numbers
• Restore class instances
• Custom deserialization

Key Takeaways

Replacer

Function or array in JSON.stringify(obj, replacer)

Reviver

Function in JSON.parse(str, reviver)

🔒

Security

Use replacer to exclude sensitive data

📅

Date Handling

Use reviver to restore Date objects

Previous Topic

JSON.stringify

Converting objects to JSON strings with formatting.

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Internationalization and localization API.

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Output

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JavaScript Data Exchange

Replacer & Reviver

Transform data during JSON.stringify() and JSON.parse()

Find videos you like?

Save to resource drawer for future reference!

Transform During Conversion

Replacer filters/transforms values during stringify. Reviver transforms values during parse. Perfect for handling dates, excluding sensitive data, or custom serialization.

Replacer Function

Transform values during JSON.stringify()

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Replacer Array

Whitelist specific properties

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Reviver Function

Transform values during JSON.parse()

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Real-World Example: Date Handling

Proper date serialization and deserialization

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Sanitize Sensitive Data

Remove passwords, tokens, and private fields

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Custom Class Serialization

Handle custom objects properly

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

When to Use

Replacer (stringify)

• Exclude sensitive data
• Filter properties
• Transform dates/objects
• Custom serialization

Reviver (parse)

• Convert date strings to Date
• Parse string numbers
• Restore class instances
• Custom deserialization

Key Takeaways

Replacer

Function or array in JSON.stringify(obj, replacer)

Reviver

Function in JSON.parse(str, reviver)

🔒

Security

Use replacer to exclude sensitive data

📅

Date Handling

Use reviver to restore Date objects

Coder Pod - Learn Programming Online | AI Coding Tutor & Interview Practice

JSON.stringify

Intl API

JavaScript Code Editor

Building Your Learning Module...

Replacer & Reviver

Transform During Conversion

Replacer Function

Replacer Array

Reviver Function

Real-World Example: Date Handling

Sanitize Sensitive Data

Custom Class Serialization

Replacer (stringify)

Reviver (parse)

Key Takeaways

Replacer

Reviver

Security

Date Handling

JSON.stringify

Intl API

JavaScript Code Editor

Replacer & Reviver

Transform During Conversion

Replacer Function

Replacer Array

Reviver Function

Real-World Example: Date Handling

Sanitize Sensitive Data

Custom Class Serialization

Replacer (stringify)

Reviver (parse)

Key Takeaways

Replacer

Reviver

Security

Date Handling