How do I convert JSON to CSV?

Add your JSON file to the upload area above, then press Convert. The CSV file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to CSV reduce quality?

The result is a reconstruction rather than a perfect copy. It is genuinely useful for reading and reuse, but review it before relying on it for anything important.

How large a file can I convert?

Up to 100 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

DataApproximateRuns in your browser

JSON to CSV Converter

Turn JSON files into CSV in a couple of clicks. The default data interchange format for APIs. Flat tabular text — one table, no formatting. The result is a best-effort reconstruction; check it before relying on it.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

JSON files (.json) · up to 100 MB each

or paste files from your clipboard

Ready when you are

Drop a JSON file above and FileTools360 will turn it into CSV — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your JSON files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control indentation and element names.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

JSON and CSV explained

JSON represents structured data as nested objects and arrays. It came from JavaScript but is now the default interchange format for essentially every web API.

CSV is plain text where each line is a row and commas separate the fields. There is no formatting, no formulas, and no second sheet — which is precisely why every system on earth can read it.

Where JSON files come from: APIs, configuration files and application data exports.
Where CSV is used: Database exports, analytics tools and data interchange between systems.

JSON vs CSV

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

JSON compared with CSV
Property	Source	Target
Compression	None	None
Introduced	2001	—
Browser support	Every modern language and tool.	Every spreadsheet, database and programming language.

JSON is stronger at: Native support in every modern language. Handles arbitrary nesting. Distinguishes strings, numbers, booleans and null.
CSV is stronger at: Readable by every spreadsheet, database and programming language. Plain text, so it diffs and streams well. Tiny files.

Why convert JSON to CSV?

People make this switch when they run into the limits of JSON: large flat tables, where CSV is smaller and simpler. CSV is the better fit when moving data between systems.

JSON limitations that prompt the switch: No comments allowed. Verbose for large tabular datasets. No date type, so dates are strings by convention.
What you give up: Exactly one table — no sheets, formatting or formulas. No type information, so leading zeros and long numbers get mangled.

What is preserved when converting JSON to CSV?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

CSV has no notion of data types. A product code like 007 becomes 7 unless the importing tool is told otherwise — which is a property of CSV, not a bug in the converter.

About these formats

Source

JavaScript Object Notation

The default data interchange format for APIs.

Extensions: .json
MIME type: application/json
Best for: APIs · Configuration · Structured records
Compatibility: Every modern language and tool.

Target

Comma-Separated Values

Flat tabular text — one table, no formatting.

Extensions: .csv
MIME type: text/csv
Best for: Data imports and exports · Databases · Scripts
Compatibility: Every spreadsheet, database and programming language.

Nested structures are flattened into dotted column names (user.address.city). Deeply irregular data may produce a sparse table — check the result before relying on it.

Good to know