Convert JSON to CSV Online - Free, Local & Instant
Instant JSON (.json) to CSV (.csv) converter. 100% client-side processing in your browser RAM — zero file uploads, full privacy, drag & drop or paste raw text.
Technical Comparison: JSON vs CSV
Data & Dev Config| Specification | JSON (Source) | CSV (Target) |
|---|---|---|
| Full Specification | JavaScript Object Notation | Comma-Separated Values (RFC 4180) |
| File Extension & MIME | .json (application/json) | .csv (text/csv) |
| Data Typing Model | Strict (strings, numbers, booleans, arrays, objects, null) | Flat text columns (auto-inferred numbers & booleans) |
| Structure & Hierarchy | Deeply nested trees & arrays | 2D tabular rows (nested keys flattened via dot-notation) |
| Comments Support | Not supported in RFC 8259 (supported via relaxed parser) | None |
| Primary Ecosystem | REST APIs, web apps, NoSQL document stores, modern configs | Excel, Google Sheets, pandas DataFrames, BI & analytics imports |
JSON to CSV — 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"
}
}
]
id,name,email,role,active,score,address.city,address.country 1,Alice Johnson,alice@example.com,admin,true,98.5,Berlin,DE 2,Bob Smith,bob@example.com,editor,false,87,Austin,US 3,Chiara Rossi,chiara@example.com,viewer,true,91.25,Milan,IT
Frequently Asked Questions: JSON to CSV
How do I convert JSON to CSV 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 CSV 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 CSV? ▾
When converting hierarchical structures (Deeply nested trees & arrays) and tabular or config formats (2D tabular rows (nested keys flattened via dot-notation)), 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 CSV 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 CSV back to JSON? ▾
Yes! Click the "Swap (CSV → JSON)" button at the top of the workspace or use the reverse converter link at the bottom of this page for bidirectional conversion.