Convert JSON to JavaScript Object Online - Free, Local & Instant
Instant JSON (.json) to JavaScript Object (.js) converter. 100% client-side processing in your browser RAM — zero file uploads, full privacy, drag & drop or paste raw text.
Technical Comparison: JSON vs JavaScript Object
Data & Dev Config| Specification | JSON (Source) | JavaScript Object (Target) |
|---|---|---|
| Full Specification | JavaScript Object Notation | ES Module JavaScript Object Literal |
| File Extension & MIME | .json (application/json) | .js (text/javascript) |
| Data Typing Model | Strict (strings, numbers, booleans, arrays, objects, null) | Unquoted identifier keys, single-quoted strings, ES export default |
| Structure & Hierarchy | Deeply nested trees & arrays | Arbitrarily nested JS objects and arrays |
| Comments Support | Not supported in RFC 8259 (supported via relaxed parser) | Supported (// and /* */) |
| Primary Ecosystem | REST APIs, web apps, NoSQL document stores, modern configs | Vite/Webpack configs, TypeScript/JS mock data, Next.js constants |
JSON to JavaScript Object — Before & After Example
[
{
"id": 1,
"name": "Alice Johnson",
"email": "alice@example.com",
"role": "admin",
"active": true,
"score": 98.5,
"address": {
"city": "Berlin",
"country": "DE"
}
},
{
"id": 2,
"name": "Bob Smith",
"email": "bob@example.com",
"role": "editor",
"active": false,
"score": 87,
"address": {
"city": "Austin",
"country": "US"
}
},
{
"id": 3,
"name": "Chiara Rossi",
"email": "chiara@example.com",
"role": "viewer",
"active": true,
"score": 91.25,
"address": {
"city": "Milan",
"country": "IT"
}
}
]
const data = [
{
id: 1,
name: 'Alice Johnson',
email: 'alice@example.com',
role: 'admin',
active: true,
score: 98.5,
address: {
city: 'Berlin',
country: 'DE',
},
},
{
id: 2,
name: 'Bob Smith',
email: 'bob@example.com',
role: 'editor',
active: false,
score: 87,
address: {
city: 'Austin',
country: 'US',
},
},
{
id: 3,
name: 'Chiara Rossi',
email: 'chiara@example.com',
role: 'viewer',
active: true,
score: 91.25,
address: {
city: 'Milan',
country: 'IT',
},
},
];
export default data;
Frequently Asked Questions: JSON to JavaScript Object
How do I convert JSON to JavaScript Object online without uploading sensitive files? ▾
Paste your JSON data or drag and drop a .json file into the converter above. ZeroUpload parses JSON and serializes JavaScript Object 100% inside your browser RAM using local JavaScript—no bytes are ever sent to an external server.
How are nested objects or tabular columns mapped between JSON and JavaScript Object? ▾
When converting hierarchical structures (Deeply nested trees & arrays) and tabular or config formats (Arbitrarily nested JS objects and arrays), our engine automatically flattens or unflattens dot-separated keys (such as address.city) and preserves numbers, booleans, arrays, and null values.
Is this JSON to JavaScript Object converter free for commercial and production config files? ▾
Yes. The tool is completely free, requires no account or API key, and works offline once loaded. Because execution happens in local memory, it is safe for proprietary JSON, database exports, and production secrets.
Can I convert JavaScript Object back to JSON? ▾
Yes! Click the "Swap (JavaScript Object → JSON)" button at the top of the workspace or use the reverse converter link at the bottom of this page for bidirectional conversion.