Private CSV JSON

Private bidirectional data converter

Convert CSV and JSON without uploading data.

Parse quoted rows correctly, preview inferred types, choose flattening rules, and download a reproducible conversion.

Use the free tool

Runs in this browser

CSV to JSON converter

The converter treats headers, delimiters, empty values, numbers, booleans, and nested JSON as explicit choices. It reports malformed rows instead of silently shifting columns.

Ready

Private by design. Pasted and selected data stays in this tab and is never posted to a conversion service.

The jobs this tool completes

Built around the failure points.

01

Correct quoted-field parsing

Keep commas, line breaks, and escaped quotes inside a CSV cell instead of splitting blindly.

02

Visible type policy

Choose whether `0012`, `true`, `null`, and empty cells remain strings or become typed values.

03

Bidirectional export

Convert either direction and download UTF-8 output with a parsing summary.

Workflow

From input to an auditable output.

  1. Choose CSV→JSON or JSON→CSV and paste the source data.
  2. Set delimiter, type inference, pretty printing, and optional flattening.
  3. Review headers, rows, inferred types, and any exact parse errors before copying or downloading.

Learn the details

Use the result with fewer surprises.

Guide

CSV quoted fields, commas, and line breaks

Understand how a real CSV parser handles delimiters, escaped quotes, embedded newlines, and uneven rows.

Read guide →Guide

CSV to JSON type inference without surprises

Choose when CSV values should become JSON numbers, booleans, nulls, or remain exact strings.

Read guide →

Common questions

What this tool does—and does not do.

Correct quoted-field parsing

Keep commas, line breaks, and escaped quotes inside a CSV cell instead of splitting blindly.

Visible type policy

Choose whether `0012`, `true`, `null`, and empty cells remain strings or become typed values.

Bidirectional export

Convert either direction and download UTF-8 output with a parsing summary.

Does this guarantee the result will be accepted elsewhere?

No. The tool completes and explains its calculation or transformation, but another platform can apply different limits, rules, encoders, or policies. Verify consequential output in the destination.

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Convert data

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