Developer Tools

13 free tools in this category · No signup · Open source

All 42 HTML Tools 4 Developer Tools 13 Text Tools 7 Encoding 4 Cryptography 7 Generators 7
JSON Formatter
Format, validate, and minify JSON instantly. Sort keys alphabetically, view error posi…
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URL Encoder / Decoder
Encode or decode URLs and query strings. Supports component encoding, full URL encodin…
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UUID Generator
Generate RFC 4122 v4 UUIDs. Bulk generate up to 1000 at once, choose uppercase, no-hyp…
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JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, expiration, issuer, and veri…
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Regex Tester
Test JavaScript regular expressions with live match highlighting, capture groups, repl…
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Timestamp Converter
Convert between Unix timestamps, ISO 8601, and human-readable dates. Supports millisec…
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SQL Formatter
Format and beautify SQL queries instantly. Supports PostgreSQL, MySQL, SQLite, BigQuer…
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Cron Expression Builder
Build, validate, and explain cron expressions in plain English. Preview the next 5 run…
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YAML Formatter & Validator
Format and validate YAML — for Kubernetes manifests, Docker Compose, GitHub Actions, A…
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XML Formatter
Pretty-print XML with proper indentation. Handles SOAP responses, RSS feeds, configura…
IP CIDR Calculator
Calculate network details from CIDR notation: netmask, broadcast, first/last host, tot…
.gitignore Generator
Generate a .gitignore by combining 22+ language and OS templates. Pick Node + Mac + VS…
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HTTP Headers Inspector
Inspect HTTP response headers from any URL. See server, content-type, caching, and aud…
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