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DotenvからJSONへのコンバーター（双方向）

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入力

自動処理

出力

クライアント側

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ガイド

Dotenv to JSON Converter

Convert between .env files and JSON instantly with this bidirectional converter. Paste your .env content to get a clean JSON object, or paste JSON to generate properly formatted KEY=VALUE pairs. Handles quoted values, inline comments, multiline strings, export prefixes, and supports nested JSON output by splitting keys on double underscores (__). Perfect for developers migrating configuration between formats or integrating environment variables into JSON-based config systems.

使い方

Select your conversion direction — .env to JSON or JSON to .env — then paste your content into the input area. The converter processes your input automatically and displays the result with syntax highlighting. Toggle options like key sorting, empty value filtering, or nested JSON mode to customize the output. Copy the result to your clipboard in one click.

特徴

双方向変換 – Switch between .env → JSON and JSON → .env with a single toggle
Nested JSON Support – Split keys on __ to create nested objects (e.g., DB__HOST=localhost になります {"DB": {"HOST": "localhost"}})
Full .env Spec Support – Handles single and double quoted values, inline comments, multiline strings, and export prefixes
キーの並べ替え – Optionally sort keys alphabetically in the output
Empty Value Filtering – Choose to include or exclude keys with empty values
Smart Quoting – When converting JSON to .env, automatically quotes values containing spaces or special characters
Auto-Generate – Output updates instantly as you type or change options

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 よくある質問

What is a .env file and why is it used?

A .env file is a plain text configuration file that stores environment variables as KEY=VALUE pairs. It is used in software development to keep sensitive configuration separate from source code. Libraries like dotenv for Node.js and python-dotenv load these variables into the application environment at runtime.
How does the double-underscore nesting convention work?

The double-underscore (__) convention is a common pattern for representing nested configuration in flat .env files. A key like DB__HOST=localhost represents a nested structure where DB is the parent object and HOST is the child key. This convention is used by frameworks like ASP.NET Core and various Docker configurations.
How are quoted values handled in .env files?

In .env files, values can be unquoted, single-quoted, or double-quoted. Unquoted values are trimmed and inline comments starting with # are stripped. Single-quoted values are taken literally with no escape sequences. Double-quoted values support escape sequences like newlines and tabs. The quoting style affects how special characters and whitespace are interpreted.
When would you convert .env to JSON or vice versa?

Common use cases include migrating configuration between systems that expect different formats, generating JSON config files for deployment pipelines from local .env files, creating .env files from JSON API responses or config exports, and debugging environment variable values by viewing them in structured JSON format.