Tool Fu
$ toolfu run csv-to-json

CSV to JSON Converter — Online Free

Convert CSV to JSON online for free. Transform CSV data to JSON arrays instantly. Handles headers, quoted fields, and special characters — runs entirely in your browser.

all processing runs in your browser
csv-to-json
input > paste CSV
output3 rows

Convert CSV to JSON Online — Free CSV to JSON Converter

CSV (Comma-Separated Values) is one of the most common formats for tabular data, but many applications and APIs expect JSON. This tool converts CSV to a JSON array of objects, using the header row as keys. Paste your CSV and get formatted, ready-to-use JSON output.

The converter handles edge cases like quoted fields, commas within values, and multi-line entries using a robust CSV parser. The output is pretty-printed with 2-space indentation for easy reading.

When to use this tool

  • Converting spreadsheet exports to JSON for API consumption
  • Preparing test data in JSON format from CSV sources
  • Migrating data between systems with different format requirements
  • Quickly inspecting CSV data in a structured JSON view
$ cat FAQ.md
How does CSV to JSON conversion work?▶
The first row of your CSV is used as the keys for the JSON objects. Each subsequent row becomes an object with those keys. For example, a CSV with headers 'name,age' and a row 'Alice,30' becomes {"name": "Alice", "age": "30"}.
Does it handle quoted fields and commas within values?▶
Yes. This tool uses a full CSV parser (PapaParse) that correctly handles quoted fields, commas within values, escaped quotes, and multi-line fields according to the CSV specification (RFC 4180).
Is my data sent to a server?▶
No. All parsing and conversion happens entirely in your browser. Your CSV data never leaves your device.