JSON to .env Converter
Flatten nested JSON config into UPPER_SNAKE_CASE environment variables for a .env file.
About JSON to .env Converter
JSON to .env Converter flattens a nested JSON config into UPPER_SNAKE_CASE environment variables, ready to paste into a .env file for Docker, Node, Python or any twelve-factor app.
How to use JSON to .env Converter
- 1Paste or type your data into the input box above (a sample is pre-filled so you can try it instantly).
- 2Adjust any options on offer — delimiter, columns, formatting and so on — to match what you need.
- 3Conversion happens instantly as you type; review the result in the output panel.
- 4Click Copy to grab the output or Download to save it as a file — JSON to .env Converter keeps everything on your device.
Why use JSON to .env Converter?
- ✓Migrating a JSON config into environment variables
- ✓Generating a .env from an API or secrets payload
- ✓Documenting config keys for a deployment
- ✓100% free with no sign-up, no watermark and no usage limits
- ✓Runs entirely in your browser — your data is never uploaded or stored
- ✓Works offline once loaded, with instant results and one-click copy or download
Frequently asked questions
How are nested keys handled?+
Nested objects are flattened with underscores — for example a database host becomes DATABASE_HOST — and camelCase keys are split into SNAKE_CASE.
What happens to arrays?+
Array values are joined with commas into a single variable, which most config loaders can split back into a list.
Is it free to use?+
Yes — it is completely free with no sign-up, no account and no usage limits. There is no watermark and no paywall, so you can process as many files as you like.
Is my data private and secure?+
Yes. This tool runs entirely in your browser using client-side JavaScript — your data is never uploaded to a server, stored or logged. Once the page has loaded you can even use it offline, which makes it safe for confidential or proprietary files.
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