Developer tools

19 of 19 tools ready — every one runs entirely in your browser. Nothing is uploaded, ever.

Code & data4 Encoding & crypto5 Text & regex4 Frontend & design3 Time & network3

Code & data

4 tools

JSON formatterPretty-print, minify and validate JSON, with the error position called out.readyCode & data

SQL formatterReformat and indent SQL queries for your dialect.readyCode & data

YAML / JSON / CSV converterConvert structured and tabular data between YAML, JSON and CSV.readyCode & data

JSON to TypeScriptGenerate TypeScript interfaces from a JSON sample.readyCode & data

Encoding & crypto

5 tools

JWT decoderInspect the header, payload and expiry of a token — locally, obviously.readyEncoding & crypto

Base64 encoderEncode and decode text or files to Base64, straight from disk.readyEncoding & crypto

URL encoderPercent-encode or decode URLs and query strings.readyEncoding & crypto

Hash generatorMD5, SHA-1, SHA-256 and SHA-512 digests via the Web Crypto API.readyEncoding & crypto

UUID generatorBulk-generate UUID v4 and ULID identifiers with one keystroke.readyEncoding & crypto

Text & regex

4 tools

Regex testerTest regular expressions against sample text with match highlighting.readyText & regex

Diff checkerCompare two texts or code snippets side by side, line by line.readyText & regex

Case convertercamelCase, snake_case, kebab-case, PascalCase, Title Case and more.readyText & regex

Duplicate line removerDrop duplicate lines from a list, with sort and trim options.readyText & regex

Frontend & design

3 tools

Color & contrast checkerPick colors and check WCAG AA/AAA contrast ratios as you go.readyFrontend & design

Shadow & gradient generatorCompose CSS box-shadows and gradients visually, copy the CSS out.readyFrontend & design

SVG optimizerStrip metadata and round coordinates to shrink SVG files.readyFrontend & design

Time & network

3 tools

Unix timestamp converterConvert between Unix epochs and human dates, in either direction.readyTime & network

Cron explainerParse cron expressions into plain language and preview upcoming runs.readyTime & network

HTTP status lookupSearch HTTP status codes with meaning and usage notes.readyTime & network

35 of 35 tools built overall · all tools

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