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JSON to Env
Flatten nested JSON into ready to paste UPPER_SNAKE environment variables.
Flatten JSON into env variables
Result: —
How to use the JSON to Env
- Paste a JSON object into the input box.
- Set an optional key prefix such as APP or API.
- Click Convert to env and copy the generated lines.
Features
- Nested objects flatten to UPPER_SNAKE keys
- Camel case keys become underscore separated
- Arrays of values become comma separated lists
- Values are quoted automatically when they need it
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Frequently Asked Questions
Common questions about the free online json to env.
Paste a JSON object, set a key prefix if you want one and click Convert to env. Every leaf
value becomes one UPPER_SNAKE line.
Nested objects are joined with underscores, so a host key inside a database object becomes
DATABASE_HOST in the output.
Yes. A key such as maxRetry is split on the capital letter and written as MAX_RETRY so it
matches env naming conventions.
An array of simple values becomes one comma separated line, while an array of objects is
expanded with an index in the key name.
Values are quoted when they contain spaces, quotes, dollar signs or other shell characters,
and the quote option can force it for all values.
Null values become empty assignments so the key still exists, which keeps your env file shape
predictable.
No. The flattening happens inside your browser, so configuration data never leaves your
device.
Input that is not valid JSON, an empty object or a top level array produces a clear error
message instead of output.
Last updated: October 10, 2026