How do I convert JSON to environment variables?

Paste your JSON into the converter above and click Convert. Nested keys are flattened with underscores: {database: {host: 'localhost'}} becomes DATABASE_HOST=localhost. camelCase keys are converted to UPPER_SNAKE_CASE: apiKey becomes API_KEY.

How do I convert appsettings.json to environment variables?

Paste your appsettings.json into the converter. Nested sections like ConnectionStrings.DefaultConnection are flattened to CONNECTIONSTRINGS_DEFAULTCONNECTION. This matches the ASP.NET Core environment variable override convention where double underscore __ or colon : separates hierarchy levels.

How do I convert JSON to .env in Node.js?

Flatten the JSON object recursively: function toEnv(obj, prefix='') { return Object.entries(obj).flatMap(([k, v]) => { const key = (prefix ? prefix + '_' : '') + k.toUpperCase(); return typeof v === 'object' && !Array.isArray(v) ? toEnv(v, key) : [`${key}=${v}`]; }); } Then write to .env with fs.writeFileSync('.env', toEnv(data).join('\n')).

Convert JSON to .env — Flatten Nested JSON to KEY=VALUE

JSON to .env Converter 100% client-side

Nested JSON keys are flattened with underscores: {"db": {"host": "localhost"}} → DB_HOST=localhost

JSON input

.env ready

Common use cases

Node.js and Docker

Convert a JSON config file to a .env file for use with dotenv, Docker Compose or Kubernetes ConfigMaps. Nested config sections become prefixed env var names — database.host becomes DATABASE_HOST.

ASP.NET appsettings.json

ASP.NET Core reads environment variables as config overrides. Convert your appsettings.json to env vars to override config in CI/CD pipelines or Docker containers — matching the SECTION__KEY convention with the double-underscore separator option.

CI/CD pipelines

GitHub Actions, GitLab CI and CircleCI accept environment variables as key-value pairs. Convert your JSON secrets or config to shell export statements — paste directly into a CI env block or source the file in your pipeline script.

Cloud config

AWS Lambda, ECS task definitions, App Runner and ECS all accept environment variables as key-value pairs. Convert JSON config to the right format for each service — dotenv for Lambda layers, export for shell scripts, Docker format for container definitions.

JSON flattened to env vars
in your browser. No upload.

The flattener recursively traverses the JSON tree and builds UPPER_SNAKE_CASE keys from the path. camelCase keys are converted with underscore insertion before each uppercase letter. Special characters are removed to produce valid env var names.

The double-underscore separator option produces SECTION__KEY format — the convention used by ASP.NET Core, Kubernetes ConfigMaps and many other frameworks for hierarchical environment variable overrides.

3 output formats

dotenv KEY=VALUE, shell export KEY="VALUE", and Docker --env KEY=VALUE — covering every CI/CD and container use case.

camelCase → UPPER_SNAKE

apiKey → API_KEY, maxRetries → MAX_RETRIES — automatic conversion following shell env var naming conventions.

Key prefix option

Add a prefix to all generated keys — APP_DATABASE_HOST, MYAPP_API_KEY — for namespace isolation in shared environments.

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Frequently asked questions

How does JSON flattening to env vars work?

Nested JSON keys are joined with underscores and converted to uppercase: {database: {host: "localhost"}} becomes DATABASE_HOST=localhost. camelCase is converted with underscore insertion: apiKey becomes API_KEY. Arrays are serialized as JSON strings: tags=["a","b"] becomes TAGS=["a","b"].

How do I use the generated .env file?

Save as .env in your project root and load with dotenv (Node.js: require('dotenv').config()), python-dotenv (load_dotenv()), or godotenv (godotenv.Load()). For Docker: docker run --env-file .env myimage. For Docker Compose: env_file: - .env in your service definition.

Is the JSON to .env converter free?

Yes, completely free. No file size limits, no account required.

Convert JSON to .envFlatten nested JSONto KEY=VALUE.

JSON flattened to env varsin your browser. No upload.

Convert JSON to .env
Flatten nested JSON
to KEY=VALUE.

JSON flattened to env vars
in your browser. No upload.