Developer Tools Tools

Format and validate JSON

Encode and decode HTML entities

Test regular expressions

Minify CSS, JS, and HTML

Beautify CSS, JS, and HTML

Format SQL queries

Decode and verify JWT tokens

Compare code snippets with syntax highlighting and diff views

Query DNS records like A, AAAA, MX, NS, TXT, CNAME, and SOA

Resolve PTR records and verify forward-confirmed reverse DNS

Inspect HTTP response headers, redirects, and security header posture

Inspect TLS certificates, issuer details, SAN entries, and expiration status

Test reachability of selected TCP ports with safe request limits

Trace network hops to a destination host with bounded max-hop diagnostics

Compare DNS answers across major resolvers to verify propagation state

Lookup ASN ownership and BGP routing context by ASN, IP, or prefix

Identify device vendor from MAC address OUI prefixes and address bits

Ping a host or IP from the server to check reachability

Measure client-side latency using image/fetch requests

Client-side CPU and GPU benchmark tests