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Free Online Developer Tools

All tools run entirely in your browser. Your data never leaves your device.

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JSON Formatter & Validator

Format, validate, and minify JSON data with syntax highlighting and error detection.

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Base64 Encoder/Decoder

Encode and decode Base64 strings and files. Supports text and binary data.

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URL Encoder/Decoder

Encode and decode URLs and query parameters. Component and full URL modes.

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JWT

JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, and expiration status.

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API

API Tester

Send HTTP requests from your browser. Test CORS-enabled APIs with GET, POST, PUT, DELETE.

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HTTP Headers Reference

Browse and search 50+ HTTP headers with descriptions, examples, and RFC links.

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