CSV to JSON

Convert CSV data to JSON arrays with auto-detection, quoted field support, file upload, and type inference.

CSV to JSON

Convert CSV data into JSON arrays with auto-detection and quoted field support

Characters: 0
Options

Values with leading zeros (ZIP codes, phone numbers) always stay strings.

Paste CSV data above or upload a file, then click "Convert"

What is a CSV to JSON Converter?

A CSV to JSON converter is a tool that transforms comma-separated values (CSV) data into JSON format: the standard data format for web APIs, JavaScript applications, and modern databases. CSV files from spreadsheets, databases, and legacy systems often need to be converted to JSON for use in web applications and APIs.

CodeHelper's CSV to JSON Converter auto-detects the delimiter (comma, semicolon, or tab), handles quoted fields with embedded commas and newlines, infers data types (numbers, booleans, null), and supports direct file upload.

Key Features

  • Auto-Detect Delimiter: Automatically identifies whether your CSV uses commas, semicolons, or tabs.
  • Quoted Field Support: Correctly parses fields wrapped in quotes, including escaped quotes and embedded delimiters.
  • Type Inference: Converts numeric strings to numbers, "true"/"false" to booleans, and empty values to null.
  • File Upload: Upload .csv files directly from your computer.
  • Download JSON: Export the converted data as a .json file.

How to use the CSV to JSON Converter

  1. Paste your CSV data or upload a .csv file.
  2. Configure delimiter and header options.
  3. Click Convert to generate the JSON output.
  4. Copy or download the result.

Whether you are importing spreadsheet data into a web app, consuming legacy data exports, or building data pipelines, this free CSV to JSON converter handles all the edge cases of CSV parsing.

Need the opposite direction? Use the JSON to CSV Converter. To validate or pretty-print the output, open it in the JSON Formatter, or generate TypeScript interfaces from it with JSON to TypeScript.

Frequently Asked Questions

How do I convert a CSV file to JSON?

Upload the .csv file or paste its content, check that the delimiter and header options were detected correctly, and click Convert. Each CSV row becomes a JSON object with the header row as keys. The conversion runs entirely in your browser, so the file is never uploaded to a server.

How do I convert an Excel spreadsheet to JSON?

Export the sheet from Excel or Google Sheets with File, Save As, CSV, then convert the CSV here. Note that Excel in many European locales exports with semicolons instead of commas: this converter auto-detects that.

Why are my numbers converted as strings?

CSV has no types, everything is text. Enable type inference to convert numeric strings to numbers, "true"/"false" to booleans, and empty fields to null. Disable it when values like ZIP codes or phone numbers must keep their leading zeros.

Can I convert CSV with commas inside the values?

Yes. Fields that contain commas, quotes, or line breaks must be wrapped in double quotes in the CSV (spreadsheet exports do this automatically), and this parser handles quoted fields and escaped quotes correctly.

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