CSV ↔ JSON Converter
Convert between CSV and JSON with auto-detection, table preview, and download.
Advanced — Comma · 2-space indent · Double quote · Empty string · Headers · Trim · Flatten
What is CSV ↔ JSON Converter?
CSV ↔ JSON Converter transforms tabular CSV data into structured JSON and JSON arrays back into CSV. CSV is the universal format for spreadsheets and data exports; JSON is the standard for APIs and web applications. Converting between them is essential for data migration, API integration, and spreadsheet export workflows. The tool auto-detects your input format and supports comma, semicolon, tab, and pipe delimiters.
Real-world use cases include converting API response JSON to CSV for Excel analysis, turning spreadsheet exports into JSON for app imports, handling European CSV (semicolon-delimited), and flattening nested JSON into flat columns. The table preview lets you verify conversion visually before downloading. All processing runs in your browser—no upload, no server, complete privacy.
How to Use CSV ↔ JSON Converter
- Switch to CSV → JSON or JSON → CSV. Paste your data—the tool auto-detects format and may switch tabs.
- Click Convert to transform. Switch between Raw and Table views to verify the output.
- Open Advanced to set delimiter (comma, semicolon, tab, pipe), quote character, and first-row-as-header.
- Configure JSON indentation (2 or 4 spaces) and empty-cell handling (empty string, null, omit).
- Use Flatten nested JSON when converting JSON→CSV to expand nested objects into columns.
- Click Save to download as
.jsonor.csv. Use Copy to paste elsewhere.
Tips & Best Practices
For European CSV (semicolon delimiter), select Semicolon in Advanced. Enable Trim cell values to remove leading/trailing spaces. Use Flatten for nested JSON so {"user": {"name": "Ava"}} becomes user.name as a column. The tool reports row/column mismatches—check for unmatched quotes or extra delimiters. Press Ctrl+Enter to convert and Ctrl+Shift+C to copy. For XML or YAML, use our XML JSON Converter or JSON YAML Converter.
When to Use This Tool
Use CSV ↔ JSON when migrating data between systems, preparing API responses for spreadsheet analysis, exporting database results to JSON, or handling regional CSV formats. Pair with XML JSON Converter for XML data, or JSON YAML Converter for config files. The JSON formatter helps validate JSON output. All conversion runs client-side—your data stays private.
Frequently Asked Questions
What delimiters does the CSV JSON converter support?
Comma, semicolon, tab, and pipe. Open Advanced settings and select your delimiter from the dropdown. First row can be treated as headers, and cell values can be trimmed automatically.
Can I convert JSON back to CSV?
Yes. Paste a JSON array of objects in the input and click Convert. The tool outputs CSV with object keys as column headers.
How are headers determined?
The first row of CSV is used as column headers when converting CSV to JSON. In Advanced, the 'First row is header' option controls this.
Does it handle quoted fields with commas?
Yes. Fields wrapped in quotes can contain commas, newlines, and other delimiters without breaking parsing.
Does it auto-detect CSV vs JSON?
Yes. The tool detects whether your input is CSV or JSON and selects the correct conversion direction. You can override this with the mode toggle at the top.
Can I convert API response JSON to CSV?
Yes. Paste JSON (array of objects) and click Convert. The tool extracts all keys as column headers and converts each object to a row. You can download the CSV or view it as a table.
Can I download the converted output?
Yes. Click the download button (↓) next to the output to save the result as a .json or .csv file.
How do I handle CSV with different regional formats?
European CSV often uses semicolon (;) as delimiter. Open Advanced settings and select Semicolon from the Delimiter dropdown.
Can I convert XML or YAML too?
For XML ↔ JSON, use our XML JSON Converter. For JSON ↔ YAML (config files, Docker Compose), use our JSON YAML Converter.