CSV ↔ JSON Converter | Instant Bidirectional Conversion
Free CSV ↔ JSON converter with real-time validation and customizable delimiters. Ideal for Excel exports, database migrations, and API integration. Convert instantly for spreadsheet workflows. 100% local processing ensures speed, privacy, and no uploads.
How to Use This Tool
- 1
Select direction: CSV → JSON or JSON → CSV.
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Paste your data into the input field.
- 3
Use Live mode for instant conversion or click “Convert” in Manual mode.
- 4
Copy, download, or swap conversion direction at any time.
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All operations run locally—your data stays private.
Use Cases & Examples
Excel Data Export
Convert Excel CSV exports to JSON for apps and services.
Database Migration
Transform database CSV dumps into JSON for NoSQL imports (e.g., MongoDB).
API Integration
Turn JSON API responses into CSV for spreadsheet analysis and reporting.
Data Analysis
Switch between CSV and JSON to fit each step of your data pipeline.
How CSV ↔ JSON Conversion Works
CSV is a plain-text format using delimiters (usually commas) to separate fields.
JSON is a structured key–value format widely used in APIs and storage.
CSV → JSON: the first row is treated as headers to build object keys; each subsequent row becomes an object.
JSON → CSV: arrays of objects are flattened into rows; keys become the CSV header row.
Supports multiple delimiters (comma, semicolon, tab, pipe) and validates structure during conversion.
Frequently Asked Questions
Q.Is my data sent to a server?
A. No. Everything runs locally in your browser—your data never leaves your device.
Q.What delimiters are supported?
A. Comma (,), semicolon (;), tab, pipe (|), plus any custom delimiter.
Q.Does the first row need to be a header?
A. For CSV → JSON, yes by default: the first row becomes object keys. Disable this for headerless CSV.
Q.Can I convert nested JSON to CSV?
A. Works best with flat arrays of objects. Nested JSON will be flattened or preserved as strings.
Q.Can this converter handle large files?
A. Yes—typically up to ~10MB within browser memory. For very large files, use Manual mode for better performance.
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