Developer Toolkit
Software developers, DevOps engineers, and API integrators
Essential tools for working with APIs and data. Format JSON, decode JWTs, test regex, generate hashes, convert timestamps, and calculate subnets. All in your browser.
{0} tools, one workflow
- 1
Format and validate JSON
Paste messy JSON and get it formatted, minified, or validated instantly. AI explain mode available.
JSON Formatter - 2
Decode JWT tokens
Inspect JWT header, payload, and expiration without external tools. Never paste tokens into random websites.
JWT Decoder - 3
Test regex patterns
Write and test regular expressions with live matching, capture groups, and AI-powered generation.
Regex Tester - 4
Convert timestamps
Convert between Unix epoch and human-readable dates. Essential for debugging API responses.
Unix Timestamp Converter - 5
Encode/decode Base64
Encode text or decode Base64 strings. Common for API auth headers and data URIs.
Base64 Encoder/Decoder - 6
Generate hashes
SHA-256, SHA-512, MD5 hashing for integrity checks, API signatures, and data verification.
Hash Generator - 7
Build cron expressions
Generate and validate cron syntax with a visual builder. AI mode generates from plain English.
Cron Expression Generator - 8
Calculate subnets
CIDR notation, subnet masks, host ranges, and network addresses for infrastructure planning.
IP Subnet Calculator
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Use ToolKnife tools directly from your IDE or AI agent via the MCP server.
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