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Free online developer tools

Free online developer tools for everyday jobs like reading an API response or checking a config file. They run locally in your browser, so tokens, keys and customer data never leave your machine.

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JSON formatter

Beautify, validate and minify JSON with clear error positions.

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Password generator

Strong random passwords from 6 to 64 characters, made on your device.

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Base64 encoder

Encode text to Base64 and decode it back, with full UTF-8 support.

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Safe for real data

Pasting a production payload into an unknown website is a real risk: you can't see where the data goes or how long it is kept. These tools use only the JavaScript built into your browser, so there is no server to send anything to.

Each page explains exactly what the tool does, including edge cases such as large numbers losing precision, so the output never surprises you. To check the length of a text value, use the word counter.

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