Developer tools
65 developer utilities — 58 live so far.
58 of 65 live · the rest ship in waves, each unit-tested in public.
API building & testing10
- API key generator
Random keys with prefixes and entropy choices
- Basic auth header generator
user:pass to header value
- CORS tester
Diagnose cross-origin failures
- GraphQL playground
Point at an endpoint, introspect, query
- Mock API builder
Define JSON responses, get live endpoints
- OpenAPI mock server
Spec in, fake API out
- Postman to code
Collections to cURL and scripts
- REST client
Postman-lite in a tab; collections stored locally
- Webhook inbox
Temporary URL that captures callbacks
- WebSocket tester
Connect, send, log frames
Code formatting & conversion23
- .env to JSON/YAML
Config format transforms
- .gitignore generator
By language and stack
- API spec generator
Describe endpoints in plain language, get valid OpenAPI 3.1 YAML
- Chmod calculator
Permissions to octal and back
- Code screenshot
Pretty, brandable snippet images
- CSS formatter
Beautify and minify CSS
- cURL to code
fetch, axios, Python requests, Go, PHP
- Diff to patch
Create and apply unified patches
- docker run to compose
Convert commands to compose files
- GraphQL formatter
Format queries, view schemas
- HAR analyzer
Inspect browser network exports
- HTML formatter
Beautify and minify HTML
- HTML to JSX
React-ready markup conversion
- HTML to Markdown
Two-way conversion
- JS/TS formatter
Beautify and minify JavaScript / TypeScript
- JSON to any language
Go, Rust, Kotlin, Java, Python, C# types
- JSON to TypeScript
Interfaces from sample JSON
- MCP server generator
Describe your tools or paste an OpenAPI spec, get server.json plus a working MCP scaffold
- OpenAPI viewer
Validate and render specs, try requests
- px to rem converter
With configurable base size
- SVG to React component
JSX/TSX output with props
- XML formatter
Pretty-print and validate XML
- YAML formatter
Format and validate, k8s-friendly
Developer text, encoding & crypto32
- AES encrypt/decrypt
Password-protect text and files locally
- Base64 encode/decode
Text and files, URL-safe variant
- Bcrypt generator
Hash and verify with cost factor
- Byte size converter
KB/MiB/GB plus transfer-time estimates
- Case converter
camelCase, snake_case, kebab-case, Title Case and more
- Cron builder
Build and explain cron, next 10 runs, IST-aware
- Epoch converter
Unix time to human and back, ms/s, timezones
- File checksum verifier
Confirm a download matches its published hash
- Hash generator
MD5 / SHA-1 / SHA-256 / SHA-512 for text and files
- HMAC generator
Keyed hashes for webhook signatures
- HTML entity converter
Escape and unescape entities
- Invisible character detector
Find zero-width and homoglyph characters
- JWT decoder
Decode header/payload, verify signatures
- JWT generator
Create signed test tokens
- Line tools
Sort, dedupe, reverse, number, shuffle lines
- Lorem ipsum
Words, paragraphs, bytes
- Number base converter
Binary, octal, decimal, hex
- Passphrase generator
Diceware-style memorable phrases
- Password generator
Rules, pronounceable mode, bulk
- Random pickers
Numbers, strings, list shuffler, dice
- Regex find & replace
Multiline regex replace on pasted text
- Regex tester
Live highlighting, groups, cheatsheet beside
- RSA key generator
Key pairs via WebCrypto
- Slug generator
URL-safe slugs with Indic transliteration
- String escaper
JSON / SQL / shell / regex escaping
- Text diff
Line, word and character diff with merge view
- Timezone meeting planner
Compare cities, share a link
- TOTP generator
2FA codes from a secret, fully client-side
- ULID / NanoID generator
Modern sortable ID formats
- Unicode inspector
Codepoints, names, normalization
- URL encode/decode
Percent-encoding both ways
- UUID generator
v4/v7, bulk, multiple formats