Convert CSV to JSON — structured data for apps and APIs

Upload a CSV and instantly convert it to JSON arrays you can copy or download. Ideal for developers, dashboards, and data preparation tasks.

CSV to JSON Converter

How it works

This converter parses your CSV into structured JSON arrays. It is ideal for API payloads, JavaScript apps, dashboards, and data cleaning workflows. Use header mode for clean key-value objects.

  • Auto-detect works for most exports; choose semicolon for many EU datasets.
  • Header mode outputs an array of objects: [{"name":"..."}, ...].
  • No upload: all parsing happens in your browser.

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FAQ

Header mode uses the first row as keys. No-header mode generates column names like col1, col2.

This tool keeps values as strings by default to avoid losing formatting. You can convert types later in your code.

Yes. Local-only conversion.

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CSV to JSON: Convert Spreadsheet Data to JSON Format

JSON is the standard format for web APIs, configuration files, and application data. When your data starts life as a spreadsheet or CSV export, this converter transforms it into properly structured JSON — ready to use in code, APIs, or data pipelines — all in your browser.

How to convert CSV to JSON

  1. Upload your CSV file or paste CSV text directly.
  2. Choose output style — array of objects (most common), or array of arrays.
  3. Click Convert — copy the JSON output or download it as a .json file.

Common use cases

Frequently asked questions

Does the first row become the JSON keys?
Yes. By default, the first row of the CSV is treated as the header row and becomes the property keys in each JSON object.
Are data types automatically detected?
Numbers and booleans (true/false) are automatically cast to their correct types. Everything else is treated as a string.
Is my data private?
Yes — all processing is local in your browser.

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