Free Online Tools
All tools run locally in your browser. No sign-up. No server.
ToolNook is a fast, privacy-friendly toolbox for developers and daily tasks. Format JSON, decode JWT, convert images, generate hashes, and more — all client-side.
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4 toolsDeveloper
7 toolsJSON Formatter
Pretty-print, minify, and validate JSON.
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jsonformatminifyvalidate
UUID v4 Generator
Generate UUID v4 locally.
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uuidv4
Query String Parser
Parse/build URL query strings.
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queryurl
JSON ↔ YAML
Convert JSON and YAML.
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yamljson
Hash Generator
SHA-256 / SHA-1 locally.
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sha256sha1
JWT Decoder
Decode header/payload locally (no verify).
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jwtdecode
Regex Tester
Test patterns against text.
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regex