DiffCheck

.env File Parser

Parse .env files into a searchable key-value table, detect duplicate keys, and mask secrets.

Paste a .env file on the left to see parsed variables

What Is the .env File Parser?

The .env file parser is a free online tool that reads any .env file and displays all environment variables in a searchable, filterable table. Developers use .env files to store configuration — API keys, database URLs, feature flags — outside of source code. This parser helps you inspect, debug, and audit those variables without opening a terminal.

Paste your .env content and the parser instantly extracts every KEY=VALUE pair, strips comments, detects duplicate keys that could cause runtime bugs, and optionally masks sensitive values so you can safely share a screenshot.

How to Use the .env Parser

  1. Paste your .env file content into the left text area.
  2. The right panel instantly displays all variables in a table with line numbers.
  3. Use the search box to filter by key name or value.
  4. Enable Mask secrets to hide sensitive values (API keys, tokens, passwords).
  5. If duplicate keys are found, they are highlighted in amber with a warning.
  6. Click Copy to copy the current filtered variables back as .env format.

Features

  • Parses all standard .env formats: bare values, quoted strings, inline comments
  • Detects and highlights duplicate keys
  • Auto-detects secret keys (API, TOKEN, KEY, PASSWORD, SECRET) and supports masking
  • Live search filter across key names and values
  • Shows parse errors with line numbers for malformed entries
  • Copy filtered results back as .env format
  • Runs entirely in your browser — no data is ever sent to a server

FAQ

What is a .env file?

A .env file is a plain-text configuration file used to store environment variables for an application. Each line contains a KEY=VALUE pair. Variables like database URLs, API keys, and feature flags are commonly stored in .env files so they can be changed without modifying source code.

Does this tool send my .env file to a server?

No. The .env parser runs entirely in your browser using JavaScript. Your environment variables never leave your device and are never sent to any server.

What happens if I have duplicate keys in my .env file?

The parser detects and highlights duplicate keys with an amber warning. In most runtimes (Node.js, Docker, etc.) the last definition of a duplicate key wins, which can cause subtle bugs. Fixing duplicates is recommended.

How does the mask secrets option work?

When "Mask secrets" is enabled, values for keys that contain words like SECRET, PASSWORD, TOKEN, KEY, or API are partially obscured (showing only the first and last two characters). This is useful when sharing a screenshot without leaking credentials.