Data Converter

Convert JSON, CSV, TSV, YAML, and TOML locally. No uploads, no cloud processing.

Works offline

Drop your file here, or click to select

Supported:JSON

Privacy guaranteed. All conversion runs locally in your browser - your files never leave your device.

How the JSON & Data Converter works

Convert JSON, CSV, TSV, YAML, and TOML directly in your browser. Optional ODS export. Paste data or choose a file and inspect the result before downloading—without transmitting datasets.

Parsing takes place in local JavaScript memory. Fluxed detects columns, escapes CSV/TSV values, and formats structured JSON, YAML, or TOML while keeping the source on your device. YAML and TOML parsers load only when those modes are selected. CSV/TSV suit flat rows; JSON preserves types and nesting; YAML/TOML suit configs. ODS export code is loaded only when selected.

Popular conversions

CSV to JSON

JSON to CSV

JSON to YAML

YAML to JSON

JSON to TOML

TOML to JSON

CSV to TSV

TSV to CSV

CSV to ODS

Why local browser processing is safer

Traditional cloud converters upload a file to a remote system before processing it. Fluxed instead uses browser APIs, Web Workers and WebAssembly (WASM) inside the browser sandbox. Your operating system gives the page access only to files you explicitly select, and the conversion output is created locally. There is no account, analytics script or tracking cookie. After the required app assets have been cached, supported workflows can also run offline.

Frequently asked questions

Is pasted JSON sent anywhere?

No. Pasted and selected data stays in the current browser session and is processed locally.

Can Fluxed handle CSV headers?

Yes. Header rows are used as JSON property names and generated correctly when converting JSON records to CSV.

When should I use CSV instead of JSON?

Use CSV for flat tabular data and spreadsheet compatibility; use JSON when types or nested objects matter.

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