.env File Parser

100% Free

Parse and validate .env files in your browser — catch duplicate keys, empty values, and syntax errors, then export clean JSON.

Syntax Check

Dup Detect

100% Client-Side

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Paste your .env file

Everything runs in your browser — your secrets are never uploaded.

Keys

Valid

Warnings

Errors

Comments

Parsed environment variables with validation status
#	Key	Value	Status
2	DATABASE_URL	postgres://user:pass@localhost:5432/app	OK
3	DB_POOL_SIZE	10	OK
6	STRIPE_KEY	sk_test_123	OK
7	API_TOKEN	(empty)	Empty value.
10	DB_POOL_SIZE	20	Duplicate key — overrides an earlier definition of "DB_POOL_SIZE".
11	1INVALID	nope	Invalid key name — use letters, digits and underscores, and don't start with a digit.
12	—	JUST_A_LINE_WITHOUT_EQUALS	Missing '=' — not a valid KEY=VALUE assignment.

JSON

{
  "DATABASE_URL": "postgres://user:pass@localhost:5432/app",
  "DB_POOL_SIZE": "20",
  "STRIPE_KEY": "sk_test_123",
  "API_TOKEN": ""
}

Duplicate keys override earlier values: DB_POOL_SIZE

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How to Use

1 Paste the contents of your .env file into the box
2 Each line is parsed instantly as a key/value pair, comment, or error
3 Review flagged duplicate keys, empty values, and syntax issues
4 Check the generated JSON of all valid keys and values
5 Copy the JSON or download it — your secrets never leave the browser

Features

Line-by-line parsing into keys, values, comments, and blanks
Detects duplicate keys, empty values, and invalid key names
Handles quoted values, inline comments, and the export prefix
Colour-coded status for every line — OK, warning, or error
One-click export to clean, pretty-printed JSON
Runs entirely client-side — secrets are never uploaded

Why it Matters

A single typo in a .env file — a duplicate key that silently overrides another, an empty value, a missing equals sign — can break a deploy or, worse, ship a misconfiguration to production. Validating the file before it's loaded catches these problems in seconds, and doing it client-side means you never paste secrets into a remote server.

★★★★★

Use Cases

Debug Config Issues

Find the duplicate or empty key behind a broken environment

Convert to JSON

Turn a .env file into structured JSON for tooling or docs

Pre-Deploy Checks

Validate environment files before they reach CI or production

Onboard Teammates

Sanity-check a shared .env example for missing or malformed values

What this tool does

The .env File Parser reads dotenv-style configuration text line by line, validates it, and shows you exactly which lines are valid, which carry warnings, and which contain errors. It also produces clean JSON of every valid key and value.

How it works

Each line is classified as a blank, a comment, a valid KEY=VALUE pair, or a syntax error. The parser strips matching quotes, handles inline comments and the export prefix, validates key names, and tracks duplicates (last value wins, matching real dotenv behaviour). The logic is a pure function — no DOM, no network — so the same input always produces the same result.

Privacy

Everything runs locally in your browser. Your .env contents are never uploaded, logged, or stored.

Frequently Asked Questions

Is it safe to paste my .env file here?

Yes. The parser runs entirely in your browser using JavaScript — your file is never uploaded, sent to a server, logged, or stored. That said, as a general habit, prefer pasting non-production examples; closing or refreshing the page clears everything from memory regardless.

What problems does it detect?

It flags duplicate keys (where a later line silently overrides an earlier one), empty values, invalid key names (keys must start with a letter or underscore and contain only letters, digits, and underscores), and syntax errors like a missing equals sign. Each issue is shown inline against the exact line it occurred on.

Does it handle quotes and comments?

Yes. It strips a single layer of matching single or double quotes from values, removes inline comments from unquoted values (everything after ' #'), recognises full-line comments starting with #, and accepts the optional 'export ' prefix that some shells use.

What does the JSON output contain?

It's an object of every valid key mapped to its parsed value, with quotes stripped and the last value winning when a key is duplicated — matching how dotenv runtimes actually behave. Invalid lines are excluded. You can copy it or download it as env.json.

Which key/value format does it expect?

Standard dotenv syntax: one KEY=VALUE per line, with KEY made of letters, digits, and underscores. Blank lines and # comments are ignored. Values may be quoted or unquoted, and an optional 'export ' prefix is allowed.

📖

Want to understand the math?

Browse all guides →

Understanding .env Files

dotenv

Understanding .env Files: Syntax, Pitfalls & Best Practices

What .env files are, the exact syntax rules they follow, the silent bugs that bite teams (duplicate keys, empty values, bad quoting), and how to validate a file before it breaks a deploy.

23 Jun 2026

5 min read

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