JSON Converter
FileFlip converts JSON files into 5 other formats entirely inside your browser, using the text engine compiled to WebAssembly. The JSON file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a JSON file?#
- Drop your JSON file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert JSON files online?#
Yes, because nothing is uploaded. FileFlip converts JSON files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a JSON file#
FileFlip converts JSON into 5 formats with the text engine, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Data Files |
|---|---|
| File extension | .json |
| FileFlip support | Read and written |
| Conversions available | 5 |
| Engines | the text engine |
| Downloaded to your browser | Nothing. Your browser already has everything these conversions need |
What is a JSON file?#
A JSON file holds data as nested objects and arrays built from strings, numbers, booleans and null, and nothing else, written in the syntax JavaScript uses for object literals.
Reach for JSON when data moves between programs and nobody needs to hand-edit it, since every language parses it the same way.
Convert JSON to YAML or TOML when a person needs to edit the file directly and wants comments, or to CSV when a spreadsheet or a script expecting rows is the destination.
The JSON file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
JSON questions people ask#
Why doesn't JSON support comments?
JSON has no comment syntax by design. Douglas Crockford, who specified JSON, has said he removed comments deliberately after seeing people use them to hold parsing directives that broke interoperability between tools. A config file written in JSON that needs to explain itself either adds a plain key like _comment by convention, or moves to a JSON superset like JSON5 or JSONC, which aren't plain JSON.
What happens when I convert a JSON array of objects to CSV?
Converting JSON to CSV only works cleanly when the JSON is a flat array of objects sharing the same keys, because CSV has no way to represent nesting. A nested object or array inside a field gets flattened with a naming convention like address.city, stringified as JSON text inside one cell, or dropped, depending on which tool is doing the conversion.
Does JSON have a date type?
No, JSON has no date or time type. Dates in JSON files are always strings, most often ISO 8601 like 2026-08-26, or Unix timestamps written as numbers, and which convention a given API uses is something you have to check rather than infer from the format itself.
What happens to a JSON object when I convert it to XML?
A JSON object's keys become XML elements when converted to XML, since JSON has no equivalent of an XML attribute and the converter has to pick elements for everything. A JSON array needs a wrapper element plus a repeated child element to become valid XML, both of which JSON's own syntax never required.