Paste, upload, or drag-and-drop your delimited data. Instantly convert to clean, well-structured JSON. No data is ever sent to a server — everything runs locally in your browser.
Input Data
Drop a .csv or .tsv file here, or click to browse
Supports comma-separated, tab-separated, and pipe-delimited formatsJSON Output
Click "Convert" or paste data above to see JSON output here...
How to Use
Follow these simple steps to convert your data.
Prepare your data
Ensure your data has a header row with column names as the first line. Each subsequent line should contain values separated by your chosen delimiter (comma, tab, semicolon, or pipe).
Input your data
Paste directly into the text area, click "Upload" to select a .csv or .tsv file, or drag-and-drop a file onto the drop zone.
Select delimiter
Choose the correct delimiter that matches your data. The tool auto-detects, but you can override it. Commas for CSV, tabs for TSV, or custom delimiters.
Choose output format
Toggle between "Pretty" (formatted with indentation) or "Minified" (compact, single-line) JSON output.
Convert and export
Click "Convert" to generate JSON. Use "Copy" to copy to clipboard or "Download" to save as a .json file.
Key Facts
- CSV stands for Comma-Separated Values, a format dating back to the 1970s.
- JSON (JavaScript Object Notation) is the most widely used data interchange format on the web.
- TSV uses tabs as delimiters, ideal for data containing commas (like addresses).
- JSON supports nested structures and data typing that CSV/TSV cannot represent.
- Conversion is 100% client-side — zero data leaves your browser.
Pro Tips
- Always include a header row — column names become JSON keys.
- Use quotes around values that contain your delimiter (e.g.
"New York, NY"). - Trim extra whitespace from your data for cleaner JSON output.
- For large datasets (>10,000 rows), use the minified output for smaller file size.
- Preview the parsed columns in the status bar before converting.
Use Cases
Real-world applications for CSV/TSV to JSON conversion.
API Data Migration
Convert legacy CSV exports into JSON payloads for REST API ingestion. Most modern APIs require JSON, making this conversion essential for data pipelines.
Analytics & Reporting
Transform spreadsheet exports into structured JSON for visualization libraries like D3.js, Plotly, or Chart.js. JSON's nested structure enables richer dashboards.
Database Imports
Prepare CSV exports from SQL databases for import into NoSQL databases like MongoDB or Firebase, which natively use JSON/BSON document models.
Configuration Files
Convert tabular configuration data into structured JSON config files for applications and microservices that require hierarchical settings.
ETL Pipelines
Use as a quick transformation step in extract-transform-load workflows where source data arrives as flat files but downstream systems expect JSON.
App Development
Convert test data from spreadsheets into JSON fixtures for mobile and web app development. Rapidly prototype with real data structures.
Examples
See how different input formats map to JSON output.
name,email,role Alice Johnson,alice@example.com,Admin Bob Smith,bob@example.com,Editor Carol Williams,carol@example.com,Viewer
[
{
"name": "Alice Johnson",
"email": "alice@example.com",
"role": "Admin"
},
{
"name": "Bob Smith",
"email": "bob@example.com",
"role": "Editor"
},
{
"name": "Carol Williams",
"email": "carol@example.com",
"role": "Viewer"
}
]
product price quantity Widget A 19.99 100 Widget B 29.99 75 Widget C 9.99 200
[
{
"product": "Widget A",
"price": "19.99",
"quantity": "100"
},
{
"product": "Widget B",
"price": "29.99",
"quantity": "75"
},
{
"product": "Widget C",
"price": "9.99",
"quantity": "200"
}
]
About This Tool
Everything you need to know about the CSV/TSV to JSON Converter.
This tool was built to solve a common but frustrating problem: quickly converting flat, delimited data into structured JSON without sending sensitive information to a third-party server. No uploads, no databases, no tracking — just pure client-side JavaScript doing the heavy lifting.
The parser correctly handles quoted fields, escaped characters, empty values, and mixed data types. It auto-detects the delimiter by analyzing the first few lines of your input, but you can always override the detection manually. The output supports both pretty-printed (human-readable) and minified (compact) JSON formats.
Whether you're a developer migrating data, an analyst preparing datasets, or a student learning about data formats, this tool is designed to be fast, reliable, and transparent about how your data is transformed.
Built with vanilla JS Zero data storage Instant conversion
| Feature | Details |
|---|---|
| Price | Free |
| Rendering | Client-Side Rendering |
| Language | JavaScript |
| Paywall | No |
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