Developer Tools
Free, browser-based utilities for everyday dev work. Everything runs locally — no data is sent to any server.
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JSON Formatter & Validator
Format, minify, and validate JSON instantly. Spot syntax errors with clear highlighting.
JSONFormattingValidation
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JWT Decoder
Decode and inspect JWT tokens — header, payload, expiry status. No secrets leave your browser.
JWTAuthSecurity
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Cron Expression Parser
Translate cron expressions into plain English and preview the next scheduled run times.
CronSchedulingDevOps
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Markdown Preview
Write markdown on the left, see the rendered output on the right. Supports GFM tables, task lists, and strikethrough.
MarkdownWritingGFM
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AI Token Counter
Count tokens and estimate API costs for GPT-3.5, GPT-4o, and Claude models in real time.
AILLMCost