twineconvert

free · in-browser · no upload

JSON to CSV
Converter

Drop your JSON file. We'll convert it to CSV right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .json

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a JSON from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your CSV the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert JSON → CSV

What this conversion is actually for

JSON comes out of APIs and apps; CSV is what opens in Excel/Sheets/Numbers for the non-technical people who need to filter, pivot, and chart it. Converting turns an API dump into something a finance or ops colleague can actually work with.

A real example

You pulled 2,000 orders from a REST API as a JSON array. Your ops lead wants to pivot them by region in Excel. Convert to CSV here, send the file, they open it in Excel and pivot, no JSON tooling on their end.

Troubleshooting

Nested objects became [object Object] or weird strings.

CSV is flat, it has no way to represent nested structures. Nested objects/arrays get JSON-stringified into a single cell. If you need nested fields as their own columns, flatten the JSON first (e.g., `address.city` → a `city` key) before converting.

Rows have different columns / missing values.

If the JSON objects don't all have the same keys, the CSV header is the union of all keys and missing values are blank. That's correct behavior, but if you expected uniform rows, the source data is heterogeneous; inspect the JSON.

Formats involved

About JSON and CSV

JSON, JavaScript Object Notation

JSON is a lightweight text format for structured data, nested objects, arrays, strings, numbers, booleans. It's the lingua franca of web APIs, configuration files, and data interchange between programs. Human-readable when formatted, machine-parseable in every programming language, and roughly half the size of equivalent XML.

How to open

Any text editor reads JSON. Browsers display .json files in a formatted tree view. VS Code and similar editors highlight syntax.

Full JSON format guide →
CSV, Comma-Separated Values

CSV is plain text, one row per line, fields separated by commas. The simplest possible tabular data format, which is exactly why it remains the most portable: every spreadsheet, database, programming language, and analytics tool reads CSV. Tradeoffs: no formulas, no formatting, no multiple sheets, and various edge cases around quoting fields that contain commas or newlines.

How to open

Excel, Google Sheets, Apple Numbers, LibreOffice Calc, any text editor, every database import wizard, every programming language with one line of code.

Full CSV format guide →

Related tools

Convert other files to CSV

Convert your JSON to other formats

FAQ

Common questions

Is this JSON → CSV converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert JSON to CSV?

API responses, configuration files, structured data interchange. Universal tabular data interchange. The most common reason to convert is compatibility, CSV works in places where JSON doesn't, or vice versa.

How do I open a JSON file in the first place?

Any text editor reads JSON. Browsers display .json files in a formatted tree view. VS Code and similar editors highlight syntax.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.