CSV to JSON Online

How to use the CSV to JSON

Enter or paste your input in the tool above.
Choose the available options and select Run tool or Process locally.
Review, copy, or download the generated result.

What does the CSV to JSON do?

Each non-empty CSV row becomes an object whose property names come from the first row. Values remain strings so that identifiers, leading zeroes, and formatting are not silently changed.

Common uses

Transform spreadsheet exports for APIs
Create JSON fixtures from tabular data
Inspect CSV records as named objects

CSV to JSON example

Example input

name,language
Ada,Python
Brendan,JavaScript

Example output

[
  { "name": "Ada", "language": "Python" },
  { "name": "Brendan", "language": "JavaScript" }
]

Limitations and important notes

A header row is required
The delimiter is comma, not tab or semicolon
Automatic number and date type inference is intentionally avoided

Private browser-based processing

Your data is processed locally in your browser and is not uploaded or stored on our servers. Tool inputs are not saved to local storage.

CSV to JSON features

Free to use with no registration
Fast client-side processing
Clear validation and useful error messages
Copy and download support
Mobile-friendly accessible interface

Frequently asked questions

Why are numbers returned as JSON strings?

CSV has no standard type system. Keeping strings prevents accidental loss of leading zeroes or identifier formatting.

Are quoted commas supported?

Yes. Commas inside properly quoted CSV cells are preserved as part of the value.

Is the CSV to JSON free to use?

Yes. The CSV to JSON is completely free and requires no account or installation.

Is my data uploaded when using CSV to JSON?

No. Your input and result are processed locally inside your browser and are not sent to our server.

Can I use CSV to JSON on mobile?

Yes. The tool works in modern desktop and mobile browsers.