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Developer Tools

Utilities for building software.

The everyday utilities developers reach for, all free and in one place. Format and validate JSON, convert between JSON, CSV, XML, and YAML, encode and decode Base64 and URLs, decode JWTs, generate UUIDs and hashes, and test regular expressions. There is also a full suite of network and security tools: DNS, SSL, ping, traceroute, and header checks. Client-side tools keep your data on your device, and network tools send only the minimum needed.

Popular Developer Tools

Developer Tools
JSON Formatter
Format, minify, and validate JSON with precise error locations.
Used 4.1K timesUpdated never
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Developer Tools
Reverse DNS Lookup
Look up PTR reverse DNS records for a public IP address. Resolve hostnames and verify forward DNS (FCrDNS) alignment.
Used 1 timesUpdated 7 minutes ago
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Developer Tools
API Tester
Send HTTP requests with custom methods, headers, and bodies, then inspect status, headers, and response — no CORS limits.
Used 1 timesUpdated 13 minutes ago
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Developer Tools
SQL Minifier
Minify SQL queries by removing extra whitespace and optional comments, with keyword casing controls.
Used 1 timesUpdated 11 minutes ago
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Developer Tools
HTML Formatter
Format and beautify HTML markup with indentation, readable tag breaks, and optional minification.
Used 1 timesUpdated 10 minutes ago
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Developer Tools
JSON to CSV
Convert JSON arrays of objects to CSV with configurable delimiters and nested field flattening.
Used 0 timesUpdated never
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Developer Tools
CSV to JSON
Convert CSV spreadsheets to JSON arrays with header detection, type parsing, and dot-key unflattening.
Used 0 timesUpdated never
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Developer Tools
Regex Tester
Test regular expressions live against sample text with flags, match details, and replace preview.
Used 0 timesUpdated never
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Developer Tools
UUID Generator
Generate RFC 4122 UUID v4 identifiers in bulk with optional uppercase and hyphen formatting.
Used 0 timesUpdated never
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Developer Tools
URL Encoder / Decoder
Encode or decode URL strings with encodeURI or encodeURIComponent, entirely in your browser.
Used 0 timesUpdated never
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Developer Tools
Base64 Encoder
Encode UTF-8 text to Base64 instantly in your browser with byte-size stats.
Used 0 timesUpdated never
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Developer Tools
Base64 Decoder
Decode Base64 strings back to UTF-8 text instantly in your browser with byte-size stats.
Used 0 timesUpdated never
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