{"generatedAt":"2026-07-19T03:01:59.607Z","tool":{"id":"env-file-validator","name":"ENV File Validator","description":"Validate .env files against .env.example — catch missing variables, empty values, and type mismatches","category":"devtools","icon":".env","keywords":["env file validator","dotenv checker","env example validator","missing environment variables","env validation","dotenv","config","environment"],"isNew":true,"remoteCallable":true,"remoteMode":"dedicated_api","riskClass":"M","maxInputBytes":262144,"timeoutMs":4000,"supportsStreaming":false,"url":"/env-file-validator/","tags":["devtools"],"faqs":[{"question":"What is the ENV File Validator?","answer":"It validates your .env file against a .env.example template, catching missing variables, empty values, undocumented extras, and type mismatches before they cause runtime errors in production."},{"question":"How do I use the ENV File Validator?","answer":"Paste your .env file on the left and your .env.example template on the right. The tool instantly shows a color-coded report of all issues: missing variables (red), undocumented extras (amber), empty values (orange), and type mismatches (blue)."},{"question":"Is this tool free?","answer":"Yes, Free to use with no signup. All validation happens in your browser — your environment variables never leave your device."},{"question":"Does this tool store or send my data?","answer":"No. All processing happens entirely in your browser. Your .env contents are not sent to external servers. This is critical since .env files often contain secrets and API keys."},{"question":"How to prevent missing env vars in production?","answer":"Use this tool in your CI/CD pipeline by validating .env against .env.example before deployment. Locally, paste both files here to catch issues before they become production KeyErrors. Enable type checking to also catch format mismatches like strings where URLs are expected."}],"howTo":[{"title":"Paste .env and .env.example in two panels","description":"Left: paste your .env (current config). Right: paste .env.example (template). Validator auto-detects variables and compares them immediately."},{"title":"Review validation results","description":"See summary cards: Valid, Missing, Extra, Empty, Type Issues. Each shows count and color (green=ok, red=error). Detailed list below shows exact problem variables."},{"title":"Check for missing or extra variables","description":"Red 'MISSING' label: key exists in template but not in your .env (will cause undefined errors). Orange 'EXTRA' label: key in your .env but not in template (undocumented)."},{"title":"Enable type checking for validation","description":"Check 'Type checking' checkbox to detect mismatches (e.g., PORT should be number, not string). View inferred types in Variable Overview table."},{"title":"Copy validation report or fix manually","description":"Click 'Copy Report' to share results with team. Fix issues: add missing vars, remove extra vars, fill empty values. Revalidate until all clear."}],"agentContract":{"toolId":"env-file-validator","contractVersion":"2.0.0","remote_callable":true,"remote_mode":"dedicated_api","risk_class":"M","max_input_bytes":262144,"timeout_ms":4000,"supports_streaming":false,"preferred_surface":"dedicated_api","dedicated_api":{"baseUrl":"https://aidevhub.io/api/env-file-validator/","openapiUrl":"https://aidevhub.io/api/openapi.yaml","endpoints":[{"method":"GET","path":"/api/env-file-validator/","summary":"GET env-file-validator"},{"method":"POST","path":"/api/env-file-validator/","summary":"POST env-file-validator"}],"riskClass":"M","inputMaxBytes":262144,"timeoutMs":4000},"runtime":{"endpoint":"/api/tools/run/","methods":["GET","POST"],"queryParams":[{"name":"toolId","required":true,"description":"Tool identifier"},{"name":"a","required":true,"description":"Primary input"}],"postBodyShape":{"toolId":"string","input":"{ a, b?, c?, mode? }"},"exampleGet":"https://aidevhub.io/api/tools/run/?toolId=env-file-validator&a=...","policy":{"riskClass":"M","limit":30,"burst":10,"windowSec":60,"inputMaxBytes":262144,"timeoutMs":4000,"cacheTtlSec":0,"networkEnabled":false,"supportsStreaming":false}}},"relatedTools":[{"id":"env-generator","name":"Environment Variable Generator","url":"/env-generator/","category":"devtools"},{"id":"env-file-manager","name":"Env File Manager","url":"/env-file-manager/","category":"devtools"},{"id":"config-validator","name":"YAML/JSON5 Config Validator","url":"/config-validator/","category":"devtools"},{"id":"cli-ux-linter","name":"CLI UX Linter","url":"/cli-ux-linter/","category":"devtools"},{"id":"ai-cli-generator","name":"AI CLI Generator","url":"/ai-cli-generator/","category":"devtools"},{"id":"csv-endpoint-builder","name":"CSV Endpoint Builder","url":"/csv-endpoint-builder/","category":"devtools"}]}}