Developer Tools
JSON formatter, encoder/decoder, hash, regex, and more — all in the browser.
Dev Tools
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JSON Formatter
Format, minify, and validate JSON with interactive tree view.
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YAML Formatter
Format and validate YAML, convert between YAML and JSON.
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SQL Formatter
Format SQL with ANSI, MySQL, or PostgreSQL dialect.
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Regex Tester
Test regex patterns with match highlighting and capture groups.
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JWT Decoder
Decode and inspect JWT header, payload, and signature.
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UUID Generator
Generate UUID v4, v7, or NIL — single or in batch.
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Hash Generator
Compute MD5, SHA-1, SHA-256, SHA-512 hashes for text or files.
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URL Tools
Parse, build, and edit URL components and query parameters.
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Cron Builder
Build cron expressions and preview the next run times.
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Color Converter
Convert HEX, RGB, HSL, HSV and generate color palettes.
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Why browser-only developer tools?
Sensitive data — API keys, JWT tokens, database schemas, production URLs — should never leave your machine. These tools run entirely in your browser using standard JavaScript APIs. There is no server, no logging, and no third-party requests. Paste freely.