Nirmion
Help Find a tool

Developer & Data

JSON to CSV

Convert an array of JSON records into escaped, spreadsheet-ready CSV in this browser.

  1. 01Runs in this browser
  2. 02Limits are explicit
  3. 03Copy or download output

Step 1

Set up the source

Use an array of objects. Every discovered property becomes a column in first-seen order, and missing values remain blank.

Confirming the published workspace...

No black box

How this tool handles the input

The converter collects a stable union of object keys, writes one header row, and applies RFC 4180 quoting to commas, quotes, and line breaks.

Before you start

What you need

A JSON array containing objects; flat records produce the clearest table.

What you get

What the page gives back

UTF-8 CSV with a header row, ready to copy or download.

Keep in mind

Use the result responsibly

Nested objects and arrays are stored as JSON text inside one cell; they are not expanded into multiple columns.

Practical uses

Where this tool earns its place

  1. Move an API record list into a spreadsheet.
  2. Create a CSV fixture from JSON test data.
  3. Prepare a small data export for a non-technical teammate.

Verified data boundary

Source text stays on this page.

The published contract marks these tools as client-only processing. Nirmion uses the API only to confirm that this workspace is enabled in MySQL; source values and results are not sent to Flask.

Keep working

CSV to JSONCSV Column Mapper