~/devtools / csv
tool::csv

CSV ↔ JSON
Converter

Bidirectional CSV and JSON converter with delimiter selection, table preview, and instant output. All processing done client-side.

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Delimiter:

Table Preview

nameagerole
Alice30Engineer
Bob25Designer
Carol35Manager
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// about this tool

About CSV ↔ JSON Converter

CSV (Comma-Separated Values) is the most universal format for tabular data, supported by spreadsheets, databases, analytics tools, and virtually every data processing platform. JSON is the standard data format for web APIs and NoSQL databases. Converting between the two is one of the most common data engineering tasks.

CSV and JSON each have their strengths. CSV is human-readable, compact, and universally supported for flat tabular data. JSON handles nested and complex structures natively and is required by most REST APIs. This tool lets you move freely between both formats without needing to write any code.

The tool supports comma, tab, and semicolon delimiters to handle all common CSV variants (including TSV). A table preview shows the first 20 rows so you can immediately verify the structure. JSON to CSV output automatically quotes fields containing delimiters or special characters per RFC 4180.

Key Use Cases
  • ▸Converting Excel/Google Sheets data to REST API JSON format
  • ▸Transforming database CSV exports for NoSQL database import
  • ▸Switching frontend mock data between spreadsheet and JSON formats
  • ▸Converting log CSV files to JSON for ingestion into analysis tools
  • ▸Testing data format transformations in ETL pipelines
FAQ
Q. What happens if a CSV field contains a comma?
Per RFC 4180, fields containing commas must be enclosed in double quotes. When converting JSON to CSV, this tool automatically quotes values containing the selected delimiter or special characters.
Q. When should I use a tab delimiter?
TSV (Tab-Separated Values) is ideal when your data frequently contains commas (e.g., prices, addresses, descriptions). Data copied directly from Excel is typically tab-delimited.
Q. Can nested JSON objects be converted to CSV?
Currently this tool supports flat JSON arrays only. Nested objects will be converted as strings. For complex nested structures, flatten the data first before converting to CSV.