Is it safe to paste API responses or keys here?

Yes. The developer tools run locally in your browser and send nothing to a server. Still, rotate any real secret you have pasted anywhere you do not control.

Which regex flavour does the regex tester use?

JavaScript's (ECMAScript), the one browsers and Node.js use. Most patterns behave the same in other languages, but lookbehind and named groups differ in some.

Are the generated Dockerfile and nginx configs production-ready?

They follow current best practice and are a solid starting point, but review them for your own app's ports, paths and security needs before deploying.

10 free tools · no sign-up

Free Developer Tools

Regex, JSON, hashes, CSV to JSON/SQL, cron, Dockerfile and nginx config generators.

DeveloperJSON Formatter & ValidatorFormat, minify and validate JSON with clear error messages.DeveloperPassword GeneratorCreate strong, random passwords with a live strength meter.NewDeveloperRegex TesterTest regular expressions live, with every match highlighted, capture groups listed and a replace preview.NewDeveloperHash GeneratorMD5, SHA-1, SHA-256 and SHA-512 hashes of text or files, HMAC signatures, and a checksum compare for downloads.DeveloperBase64 Encode / DecodeEncode text to Base64 or decode it back, with full Unicode support.NewDeveloperCSV to JSON ConverterConvert CSV to JSON, or JSON back to CSV - quoted fields, any delimiter and number detection handled properly.NewDeveloperCSV to SQL ConverterTurn a CSV file into CREATE TABLE and INSERT statements for MySQL, PostgreSQL, SQL Server or SQLite.NewDeveloperCron Expression GeneratorBuild or paste a cron expression, read it in plain English and see exactly when it will run next.NewDeveloperDockerfile GeneratorGenerate a multi-stage Dockerfile, .dockerignore and docker-compose.yml for Node.js, Python, .NET, Go or PHP.NewDeveloperNginx Config GeneratorBuild an nginx server block for a reverse proxy, static site or PHP app - HTTPS, redirects, gzip and caching included.

What these developer tools are for

The utilities developers reach for many times a day: format and validate JSON, test a regular expression, hash or Base64-encode a string, convert CSV to JSON or SQL inserts, build a cron expression you can read back, and start a Dockerfile or nginx config from a sensible template.

They run in your browser, so API responses, keys and data you paste never leave your machine.

Need it done for you?I build and fix websites for small businesses - fixed quotes, no hourly billing.

Questions

Is it safe to paste API responses or keys here?: Yes. The developer tools run locally in your browser and send nothing to a server. Still, rotate any real secret you have pasted anywhere you do not control.
Which regex flavour does the regex tester use?: JavaScript's (ECMAScript), the one browsers and Node.js use. Most patterns behave the same in other languages, but lookbehind and named groups differ in some.
Are the generated Dockerfile and nginx configs production-ready?: They follow current best practice and are a solid starting point, but review them for your own app's ports, paths and security needs before deploying.