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tools4.dev.br

Tools for payloads and APIs

Format JSON, XML, and YAML, and convert Base64 content locally in the browser. These tools are useful for debugging APIs, inspecting payloads, and working with sensitive data without sending it to third-party services.

Updated June 2026

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Tools in this cluster

Time Converter

Convert days, hours, minutes, seconds, milliseconds, and ticks into a readable duration.

Regex Tester

Run regular expressions locally against sample text and inspect matches.

XSD to Sample XML Converter

Read simple XSD elements and generate an initial XML example.

JWT Decoder

Decode JWT header and payload locally without sending tokens to a server.

URL Encoder and Decoder

Encode and decode URLs and query strings directly in the browser.

Hash Generator

Generate MD5, SHA-1, SHA-256, and HMAC SHA-256 hashes locally.

JSON Comparator

Compare two JSON documents and see added, removed, and changed fields.

HTML Converter

Encode text to HTML entities and decode HTML entities back to plain text.

Crontab Generator and Validator

Validate classic crontab expressions and use common scheduling templates.

Base64 Converter

Encode and decode Base64 text with instant local feedback.

Formatters

Format JSON, XML, and YAML with immediate readability and syntax highlighting.

Frequently asked questions

Are the data sent to a server?

No. The tool follows the Tools4.Dev.Br privacy pattern and runs the processing in the browser whenever possible.

Can I use the result in production?

Use the result as technical support and validate your product rules. For official data, always use the appropriate government, financial, or business source.

Does switching language change my input or generated result?

No. The language selector changes interface labels and metadata only; pasted, typed, copied, or generated content is preserved.

Do I need an account?

No. The tool is free to use and does not require registration for normal browser-based workflows.