JSON.stringify() and JSON.parse() are two fundamental JavaScript methods for working with JSON data. Understanding their differences is crucial for effective data handling.
In this guide, we'll explain when to use each method, how they work together, and provide practical examples. Use our free JSON.stringify() online tool and JSON Parser online to test examples instantly.
Quick Comparison
| Feature | JSON.stringify() | JSON.parse() |
|---|---|---|
| Input | JavaScript Object/Array | JSON String |
| Output | JSON String | JavaScript Object/Array |
| Use Case | Sending data, storing data | Receiving data, reading data |
| Direction | Object → String | String → Object |
JSON.stringify() - Object to String
JSON.stringify() converts JavaScript objects, arrays, or values into JSON strings. This is also known as JSON serialization.
Use JSON.stringify() online to test this instantly.
Example: JSON.stringify()
const obj = { name: "John", age: 30 };
const jsonString = JSON.stringify(obj);
console.log(jsonString);
// Output: '{"name":"John","age":30}'JSON.parse() - String to Object
JSON.parse() converts JSON strings back into JavaScript objects or arrays. This is also known as JSON deserialization or unstringify JSON.
Use our JSON Parser online to parse JSON strings instantly.
Example: JSON.parse()
const jsonString = '{"name":"John","age":30}';
const obj = JSON.parse(jsonString);
console.log(obj);
// Output: { name: "John", age: 30 }Working Together
These methods work together in a complete data flow cycle:
Create object: const obj = { name: "John" }
Stringify: JSON.stringify(obj) → '{"name":"John"}'
Send/Store: API request, localStorage, file, etc.
Parse: JSON.parse(jsonString) → { name: "John" }
Common Use Cases
JSON.stringify() Use Cases
- Sending data to API (fetch, axios)
- Storing in localStorage
- Creating JSON files
- Logging objects as strings
JSON.parse() Use Cases
- Receiving data from API
- Reading from localStorage
- Loading JSON files
- Parsing JSON strings
JSON Serialize Online vs JSON Parse Online
JSON Serialize Online = JSON.stringify() online tools
JSON Parse Online = JSON.parse() online tools (also called JSON Parser online)
Both are essential for working with JSON data. Use JSON.stringify() online to convert objects to strings, and JSON Parser online to convert strings back to objects.
Try Both Tools Online
Use our free online tools to test JSON.stringify() and JSON.parse() with any data.