JSON to CSV converter.

CSV (comma-separated values) is the plain-text table every spreadsheet opens: one row per line, one column per comma, a header row first. JSON is the structured format APIs speak. Converting between them is how an API export becomes a spreadsheet and a spreadsheet becomes data a program can read.

CSV is flat, so nested objects are flattened to dotted column names: an address object with a city becomes an 'address.city' column. Arrays can't be flattened the same way and are written as JSON text in their cell. Going back, dotted headers nest again.

Per RFC 4180: a field holding the delimiter, a double quote or a line break is wrapped in double quotes, and a quote inside it is doubled. Reading CSV, the same rules apply, so a quoted address with a comma in it stays one field.

Cells that read as numbers, true, false or null become those types; everything else stays a string. Long digit strings such as ids that would lose precision as numbers are kept as text.

No. The conversion runs in your browser as you type and the page makes no request with the data. Customer lists and exports stay on your machine.

An array of objects is the usual shape and converts row by row. A single object becomes one row, and an object that holds an array (like an API's { data: [...] }) converts that array. Columns appear in the order their keys are first seen.

Pick the direction in the bar, or convert one way and press Swap to send the result back through the other direction. The delimiter choice (comma, semicolon or tab) applies both ways; European spreadsheets often want semicolons.

Yes. Drop a .json or .csv file onto the input; it is read in your browser. The result downloads as .csv or .json with the right type, which spreadsheets open directly.

No. The JSON to CSV converter is free and opens without a sign-in, an account or an install.

Nothing. The JSON to CSV converter holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.

Comma, semicolon or tab. The choice applies in both directions, and European spreadsheets often want semicolons.

Yes. The Swap button sends the result back through the other direction, so you can check that a conversion comes back as it went in.

The result downloads with the right extension and type, .csv or .json, and spreadsheets open the CSV directly.

Closest to the JSON to CSV converter: JSON formatter and validator, Code highlighter, Text diff viewer, File to Base64. Each opens on its own page, free and in the browser.

The JSON to CSV converter is one of 7 in its group. The group's page, /tools/data, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.