JSON Serialize Online
Paste a JSON object and serialize it into a compact string, a pretty-printed version, or a double-escaped JSON string for embedding inside other JSON values.
Last updated: May 28, 2026
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Buy me a coffeeWhat is JSON Serialize Online?
JSON serialization is the process of converting a data structure (object, array, etc.) into a JSON-formatted string. In JavaScript this is done with JSON.stringify(), in Python with json.dumps(), and in C# with JsonSerializer.Serialize().
This tool lets you perform that serialization directly in your browser. Three output modes are available: Compact produces a single-line minified string; Pretty adds indentation for readability; Escaped String wraps the result in an extra layer of JSON encoding — useful when you need to embed a JSON document as a string value inside another JSON payload, database record, or message envelope.
How to Use JSON Serialize Online
Paste your JSON object or array into the input area
Choose an output mode: Compact, Pretty, or Escaped String
The serialized output appears instantly on the right
Copy or download the result
Use "Load Sample" to see an example
Common Use Cases
- Developers minifying JSON before sending it in an HTTP request body.
- Backend engineers creating escaped JSON strings to embed as values inside another JSON document.
- API engineers serializing configuration objects for storage in environment variables or databases.
- Frontend developers converting objects to strings for localStorage or sessionStorage.
- DevOps engineers serializing JSON payloads for message queues like Kafka or RabbitMQ.
Example Input and Output
A JSON object is serialized in compact mode, removing all whitespace.
{
"name": "Alice",
"age": 30,
"roles": ["admin", "user"]
}{"name":"Alice","age":30,"roles":["admin","user"]}Privacy
All serialization runs in your browser. No data is uploaded to any server.