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JSON Stringify Online

Paste JSON and produce a string version with custom indentation, sorted keys, and optional Unicode escaping — like JSON.stringify with extra options.

Last updated: May 26, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is JSON Stringify Online?

JavaScript's `JSON.stringify(value, replacer, indent)` converts a value to a JSON string. The standard arguments cover the basics — indentation and a replacer function — but production work often needs more: sorting keys for canonical output, escaping non-ASCII characters for ASCII-only systems, or producing the exact JS call expression for use in source code.

This tool gives you all those controls in one place. Paste JSON, pick options, and get the stringified result. The "wrap as JS call" option produces the exact `JSON.stringify(...)` source line, ready to paste into a script.

How to Use JSON Stringify Online

1

Paste JSON into the input panel.

2

Choose indent (none / 2 spaces / 4 spaces / tab).

3

Toggle Sort keys, Escape Unicode, and Wrap as JS call as needed.

4

Click Copy to copy the formatted output.

Common Use Cases

  • Producing canonical, sorted-key JSON for use in cryptographic signatures or diffs.
  • Generating ASCII-only JSON for systems that do not handle UTF-8.
  • Writing a JSON value back into a JavaScript source file with the right indentation.
  • Quickly compacting a pretty-printed JSON for storage or transmission.
  • Pretty-printing minified JSON with custom indentation.

Example Input and Output

A minified JSON object becomes pretty-printed with sorted keys.

JSON input
{"name":"Alice","age":30,"active":true}
Stringified output (sorted keys, 2 spaces)
{
  "active": true,
  "age": 30,
  "name": "Alice"
}

Privacy

All stringification happens in your browser. No JSON is sent to a server.

Canonical JSON

Combining "Sort keys" with no indentation produces a deterministic canonical form, useful for hashing or comparing JSON values regardless of original key order.

Frequently Asked Questions

What is the difference between this and JSON Formatter?

JSON Formatter focuses on pretty-printing and validation. JSON Stringify exposes more options — sort keys, escape Unicode, wrap as a JS call — and is structured around the JSON.stringify API.

What does "Wrap as JS call" produce?

It outputs the exact JS expression JSON.stringify(value, null, indent) where value is your input. Useful when you want to paste the call into source code.

Why escape Unicode?

Some systems (older terminals, legacy storage, certain APIs) require ASCII-only JSON. Escaping non-ASCII characters as \uXXXX produces ASCII output that decodes to the same characters.

Does this send my JSON anywhere?

No. All processing runs locally in your browser.

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