What is the difference between JSON and a JavaScript object literal?

JSON requires all keys to be double-quoted strings and does not allow undefined values. A JavaScript object literal allows unquoted identifier keys (e.g. name instead of "name") and can use undefined.

When are quotes removed from keys?

Quotes are removed only when a key is a valid JavaScript identifier — it starts with a letter, underscore, or dollar sign, and contains only letters, digits, underscores, or dollar signs. Keys like "my-key" or "1st" keep their quotes.

Why would I convert null to undefined?

In JavaScript, null and undefined have different meanings. If you want missing values to be truly absent from an object (e.g. for TypeScript optional properties), converting null to undefined is useful.

Does this handle nested objects and arrays?

Yes. The converter processes the entire JSON tree recursively, unquoting keys and replacing null values at every level of nesting.

Is my JSON data sent to a server?

No. All processing happens entirely in your browser. Nothing is sent to any server.

JSON to JavaScript Object Converter

Name: JSON to JavaScript Object Converter
Availability: InStock
Author: Nham Vu

Paste JSON and get a clean JavaScript object literal with unquoted keys and an optional const declaration.

JSON Input

Options

Variable name

Unquote valid identifier keys

Convert null to undefined

Wrap in const declaration

Indent size

JavaScript Output

Output will appear here

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Summary

Paste JSON and get a clean JavaScript object literal with unquoted keys and an optional const declaration.

How it works

Paste or type valid JSON into the input area.
Choose options: variable name, whether to unquote keys, and whether to convert null to undefined.
Click Convert to generate the JavaScript object literal.
Review the output in the result panel.
Click Copy to copy the result to your clipboard.

Use cases

Convert API response JSON to a hardcoded JS object for mocking or testing.
Generate a typed-friendly object literal from a JSON config file.
Strip quotes from keys to make objects more readable in source code.
Replace null values with undefined for stricter TypeScript compatibility.
Quickly scaffold initial state objects from JSON data.
Prepare fixture data for unit tests.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu