Developer & Data
Parsing & Validation
Handle parsing, matching, and validation tasks
This hub keeps one family of developer and data actions together. Start with the most common inspection or transformation step, then use the rest of the tools as the workflow expands.
Task Path
Use this hub to parse, match, or validate developer inputs such as regexes, cURL, cron, HTTP headers, IP data, user agents, and file signatures. Identify the input type first, then choose the matching parser.
Good For
- Test regexes, URLs, headers, cron expressions, or cURL snippets.
- Inspect IP/CIDR data, ports, MIME types, magic bytes, or user agents.
- Understand input structure and edge cases before integrating with another system.
Next Step When parsing leads to structured-data edits, move to JSON and structured data; when the issue is encoding, escaping, or timestamps, move to encode and transform.
Watch For Parsed output helps explain the input; it is not a live connectivity check, security scan, or compliance certification.
Top Tools
Start with the most common entry points.
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CIDR Subnet Calculator
Parse a single IPv4 CIDR locally in your browser and compute the normalized subnet, mask, wildcard mask, network, broadcast, and usable endpoint range.
CIDR Aggregator
Batch-aggregate IPv4 / IPv6 CIDRs, IP ranges, and single IPs locally in your browser. Auto-buckets v4/v6, merges adjacent and containing blocks into the minimum CIDR list. Supports set subtraction (A − B), 8 export formats (CIDR / range / netmask / wildcard / CSV / JSON / nginx / iptables), line-level error diagnostics, and normalization warnings. Accepts flexible delimiters including newline, comma, full-width, space, tab, and semicolon.
IPv6 Toolkit
Parse IPv6 addresses locally in your browser: canonicalize, classify, CIDR compute, equal-length subnet split, EUI-64 round-trip, and batch validation. Includes Teredo decoding and .ip6.arpa reverse DNS generation.
Cron Expression Parser
Parse cron expressions into human readable schedules to reduce timer configuration errors.
Common Tasks
Decide which tool to open first.
All Tools
All tools in this hub.
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CIDR Subnet Calculator
Parse a single IPv4 CIDR locally in your browser and compute the normalized subnet, mask, wildcard mask, network, broadcast, and usable endpoint range.
CIDR Aggregator
Batch-aggregate IPv4 / IPv6 CIDRs, IP ranges, and single IPs locally in your browser. Auto-buckets v4/v6, merges adjacent and containing blocks into the minimum CIDR list. Supports set subtraction (A − B), 8 export formats (CIDR / range / netmask / wildcard / CSV / JSON / nginx / iptables), line-level error diagnostics, and normalization warnings. Accepts flexible delimiters including newline, comma, full-width, space, tab, and semicolon.
IPv6 Toolkit
Parse IPv6 addresses locally in your browser: canonicalize, classify, CIDR compute, equal-length subnet split, EUI-64 round-trip, and batch validation. Includes Teredo decoding and .ip6.arpa reverse DNS generation.
Cron Expression Parser
Parse cron expressions into human readable schedules to reduce timer configuration errors.
cURL Command Parser
Parse cURL commands into method, URL, headers, and body for API tooling reuse.
HTTP Header Parser
Parse raw HTTP header text into key-value structures for debugging.
HTTP Status Code Reference
Look up HTTP status codes with descriptions, usage scenarios, confusion pairs, and related codes
Magic Bytes Viewer
Browse magic bytes signatures for common file formats with search, category filters, and drag-and-drop file identification
Regex Tester
Test regex patterns with match highlighting, capture groups, replace preview, and code snippets.
Regex Visualizer
Convert regex patterns into railroad diagrams with bilingual structural explanation, common presets, and SVG/PNG export
Semver Range Checker
Check whether versions satisfy semver ranges to assist dependency upgrades.
URL Query Toolkit
Parse full URLs or raw query strings locally in your browser, preserve duplicate keys, empty values, and flag params, then rebuild the output explicitly.
User Agent Parser
Parse user agent strings and identify browser, operating system, and device details.
Shannon Entropy Calculator
Calculate Shannon entropy with log₂/ln/log₁₀ bases, normalized entropy, randomness gauge, and per-character contribution breakdown
Keyboard Event Viewer
Capture and display keyboard event properties in real time, including key, code, keyCode, modifiers, and composition events
MIME Type Reference
Look up MIME types and file extensions with bidirectional search, category filters, and one-click copy
Common Ports Reference
Look up 140+ common network ports with category and protocol filters, security risk annotations, and one-click copy
Geohash Converter
Convert between geohashes and coordinates locally in your browser with smart detection, precision 1-12, bbox details, neighbour cells, parent prefixes, GeoJSON/WKT output, and batch conversion.
Related Hubs
Nearby task clusters.