CSV to JSON

Convert CSV files into JSON format online. Supports arrays of objects keyed by header, 2D array matrix output, and automatic type inference for numbers, booleans, and null values.

Private • In-browser processing • Zero server uploads

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How to Use CSV to JSON

1
Paste CSV
Paste your CSV records into the input panel or load from a .csv file.
2
Choose Format & Types
Select 'Array of Objects' or '2D Array' and toggle Type Inference as desired.
3
Copy JSON
The valid, formatted JSON appears immediately, ready to copy or download as a .json file.

Key Features

Dual Output Formats
Convert into an Array of Key-Value Objects using header titles, or a 2D Array of rows and cells.
Smart Type Inference
Automatically recognizes and converts numbers, booleans ('true'/'false'), and 'null' literals.
RFC 4180 Standard Compliance
Handles quoted text, escaped quotes, multiline strings, and commas inside cells without error.
Custom Formatting
Select 2 spaces, 4 spaces, tab indentation, or ultra-compact minified output for APIs.

Common Use Cases

  • Converting legacy spreadsheet exports into JSON payloads for REST APIs and mobile apps.
  • Feeding mock database data into unit testing pipelines or NoSQL document stores (MongoDB, Firestore).
  • Transforming statistical datasets for web data visualization libraries (D3.js, Chart.js).
  • Integrating flat tabular files into modern web applications.

Frequently Asked Questions

When enabled, numeric strings like '42' or '19.99' are converted to JavaScript numbers, 'true'/'false' to booleans, and 'null' to null. If disabled, all fields are kept as strings.

Because our parser implements full RFC 4180 grammar, cells surrounded by double quotes that contain newlines are parsed as single multiline string fields in the resulting JSON.

Yes! All processing runs client-side using optimized memory streams, easily handling megabytes of tabular data right in your browser.

Sort CSV Data
Sort CSV rows by any column, ascending or descending, with header row support.
Change CSV Delimiter
Convert CSV between comma, semicolon, tab, pipe and other delimiters.
Prettify JSON
Format, minify, validate or sort keys of any JSON — live in your browser.
JSON to YAML
Convert a JSON document to YAML format.
Extract CSV Column
Pull a single column out of a CSV file by name or index.