Convert & Flatten JSON to CSV Instantly in Your Browser

Q: How does this converter handle nested JSON objects?

Nested keys are automatically flattened using dot notation (for example, billing.plan and billing.mrr_usd become dedicated CSV columns) so no hierarchical data is lost.

Q: Is my JSON or CSV file uploaded to any external server?

No. Every parsing and serialization step runs strictly inside your browser tab using native JavaScript. Sensitive financial, customer, or log files never leave your device.

Q: Does the generated CSV open cleanly in Microsoft Excel and Google Sheets?

Yes. Output follows RFC-4180 escaping rules—fields containing commas, quotes, or line breaks are properly wrapped in double quotes.

Transform deeply nested JSON objects or arrays into clean RFC-4180 CSV tables—or convert CSV back to structured JSON—with 100% local browser execution and zero server uploads.

✓ 100% Local Processing Target Keyword: "json to csv converter online" (165,000/mo) Est. Ad RPM: $14 – $22

INPUT SOURCE 763 chars

[
  {
    "id": "usr_1049",
    "name": "Elena Rostova",
    "role": "Staff Engineer",
    "billing": {
      "plan": "Enterprise",
      "mrr_usd": 490,
      "active": true
    },
    "tags": [
      "rust",
      "distributed-systems",
      "storage"
    ]
  },
  {
    "id": "usr_1050",
    "name": "Marcus Vance",
    "role": "Product Designer",
    "billing": {
      "plan": "Pro",
      "mrr_usd": 79,
      "active": true
    },
    "tags": [
      "design-systems",
      "accessibility"
    ]
  },
  {
    "id": "usr_1051",
    "name": "Priya Patel",
    "role": "Data Scientist",
    "billing": {
      "plan": "Enterprise",
      "mrr_usd": 490,
      "active": false
    },
    "tags": [
      "python",
      "sql",
      "forecasting"
    ]
  }
]

LIVE PROCESSED OUTPUT UTF-8 • CLIENT-SIDE

Processing...

Ready • 100% local execution Server Cost: $0.00 • Latency: <5ms

How to Use the JSON ↔ CSV Converter

STEP 01

Paste your JSON array (or drop a .json / .csv file) into the left input editor.
STEP 02

Select your conversion direction (JSON → CSV or CSV → JSON) and preferred column delimiter.
STEP 03

Inspect the live flattened output and rendered table preview, then copy to clipboard or download as a .csv file.

Frequently Asked Questions (JSON ↔ CSV Converter)

How does this converter handle nested JSON objects?

Nested keys are automatically flattened using dot notation (for example, billing.plan and billing.mrr_usd become dedicated CSV columns) so no hierarchical data is lost.

Is my JSON or CSV file uploaded to any external server?

No. Every parsing and serialization step runs strictly inside your browser tab using native JavaScript. Sensitive financial, customer, or log files never leave your device.

Does the generated CSV open cleanly in Microsoft Excel and Google Sheets?

Yes. Output follows RFC-4180 escaping rules—fields containing commas, quotes, or line breaks are properly wrapped in double quotes.