JSON to CSV
AvailableBuild CSV columns from the keys of a JSON array of objects.
JSON to CSV
AvailableNothing to show yet
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Processing
Provide a JSON array of objects. The union of object keys becomes the CSV header.
Validated locally: file type, size and browser support are checked before anything runs
Preparing your file
Reading the file locally and checking that its type and size match what this tool expects. Nothing has been uploaded.
Converting locally
JSON, CSV, XML, and YAML parsing and conversion run locally in the browser.
- Read
- Validate
- Convert
- Package
You can leave this tab open in the background — the conversion keeps running on your device, and progress is reported when you come back.
Conversion complete
Your converted file is ready to download.
Nothing to show yet
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Nothing to show yet
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Output format
CSV
Duration
—
Processed
On your device
Size change
—
The converted file was assembled in your browser and is released when you leave or reset this page
Something went wrong
The conversion could not be completed. Nothing was uploaded, and no partial file was saved.
This conversion is not supported yet
Your file passed every local check, and this is exactly where the Data & Serialization engine takes over. It does not implement this particular input and output pair yet, so nothing was converted and no download was offered.
| Engine | Data & Serialization |
|---|---|
| Frontend module | static/engines/data-engine.js |
| Extra downloads | None — this tool runs on browser APIs alone |
| Runs in a worker | No — the browser is fast enough here |
| Processing | On your device |
This page is the integration point. When the engine lands, it is loaded here and the same six states drive the real conversion.
No upload for supported tools — the file is processed by this browser
Up to 50 MB
About this converter
Build CSV columns from the keys of a JSON array of objects.
What happens to your file
For supported tools the file is read with the browser File API and held in memory on your device. It is validated, processed by the Data & Serialization engine in a Web Worker, and the result is handed back as a download. At no point is the file sent to a server.
What to expect from the output
The tool writes CSV. Formats differ in what they can represent, so expect structure to be preserved, while formatting and comments are not representable in every target format.
How to use this converter
Four steps, none of which involve an account.
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1 Choose your file
Drop a json file onto the drop area or browse for it.
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2 Check the output
The output format is preselected as CSV. Change it if the tool supports other targets.
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3 Convert
Everything happens on your device, so speed depends on your machine rather than a queue.
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4 Download
Save the result, then reset the tool to clear it from memory and start again.
Conversion states
Design referenceThese are the six states the workspace moves through. The live tool above uses the same markup; this panel shows each one side by side so the behaviour can be reviewed without converting anything.
1 Empty — no file chosen
2 File selected — ready to convert
- JSON example.json
3 Preparing — reading locally
Preparing your file
Checking the file type and size. Nothing has been uploaded.
4 Converting — progress reported
Converting locally
- Read
- Validate
- Convert
- Package
Runs in a Web Worker so the page stays responsive.
5 Completed — result ready
Conversion complete
Your converted file is ready to download.
# Release notes
- Faster image conversion
- **New:** Markdown to PDF
- Fixed line ending detection
release-notes.md
Release notes
Faster image conversion
New: Markdown to PDF
Fixed line ending detection
release-notes.html
Output format
CSV
Duration
—
Processed
On your device
Size change
—
Interface preview
This is the completed state as designed. No file was converted and the download action is disabled, because the conversion engine for this tool has not been connected yet.
The converted file was assembled in your browser and is released when you leave or reset this page
6 Error — recoverable
That file could not be read
The file appears to be damaged or its contents do not match the
.json extension. Nothing was uploaded.
Try again
Choose a different file
Frequently asked questions
Answers specific to JSON to CSV.
Is this tool free?
Yes. JSON to CSV is free to use and needs no account, no sign-up and no email address.
Where is my file processed?
This tool is being built for local processing, so the file is handled by your own browser. Until that engine is connected the page shows an explicit notice instead of pretending the conversion succeeded.
Which files can I use as input?
Accepted formats are JSON. The converter writes CSV.
Are my data files uploaded?
No. These tools parse and convert your files locally in your browser.
How is JSON represented in XML?
A JSON object's properties become child elements. Arrays are represented by repeated sibling elements; XML text and attributes become strings and @-prefixed properties when converted back to JSON.
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