Which Developer Tool Should I Use?

Start here recommendations

Before using the tool, gather the inputs or assumptions that are most likely to move the result.

• Format or transform text Use JSON Formatter, URL Encoder / Decoder, Base64 Encoder / Decoder, Unix Timestamp Converter or Color Converter.
• Generate a value or asset Use UUID Generator, Password Generator or QR Code Generator when the output should be newly generated.
• Test a pattern Use Regex Tester when you need to test a JavaScript regular expression against sample text.
• Prepare documentation Use Markdown Table Generator when pasted rows or manual cells need to become a copyable Markdown table.
• Handle secrets carefully Avoid pasting API keys, tokens, passwords or private production data unless you understand browser-side tools and trust the device.

Use this tool if...

Choose the specific utility based on what should happen to the entered value or generated output.

• JSON Formatter Use this to validate, format or minify standard JSON. It does not validate schemas.
• URL Encoder / Decoder Use this for URL components and query values. It does not fetch or safety-check destinations.
• Base64 Encoder / Decoder Use this for reversible UTF-8 text encoding. It is not encryption.
• Unix Timestamp Converter Use this for seconds, milliseconds, UTC and browser-local timestamp conversion.
• UUID Generator Use this for UUID v4 identifiers. Do not treat UUIDs as secrets or authorization tokens.
• QR Code Generator Use this for static QR codes from text or URLs. It does not create tracking links.
• Password Generator Use this to generate random passwords in the browser, then store them in a trusted password manager.
• Color Converter Use this to convert opaque HEX, RGB and HSL values. It does not test contrast.
• Regex Tester Use this to test JavaScript regex syntax and matches against sample text.
• Markdown Table Generator Use this to create copyable Markdown tables from manual cells or simple pasted data.

Example paths

Developer utilities are most useful when the input type and desired output are narrow.

API response is hard to read

JSON Formatter

Paste modest JSON, format it and copy the readable output.

Query value has spaces

URL Encoder

Encode only the component or query value, not necessarily the whole URL.

API time is a number

Unix Timestamp Converter

Choose seconds or milliseconds explicitly, then compare UTC and local output.

Need a static code

QR Code Generator

Enter the exact text or URL that should be encoded and download the generated image.

Need sample matching

Regex Tester

Test JavaScript regex flags and matches against sample text before moving back to code.

Need a README table

Markdown Table Generator

Enter rows or paste simple tabular data, then copy Markdown table output.

Use these as quick browser helpers. Move back to your project tools for code review, automated tests, schema checks and production secrets.

How to read developer-tool output

Most outputs are transformed text, generated values, sample matches or copyable documentation snippets.

Common mistakes

These are common ways developer utilities can be used outside their intended scope.

• Treating Base64 as security Base64 is reversible encoding, not encryption or hashing.
• Encoding a whole URL by accident URL component encoding can encode separators that a full URL still needs.
• Expecting link safety checks URL and QR tools transform text only. They do not check for phishing, malware, redirects or reputation.
• Using UUIDs as secrets UUIDs are identifiers. Do not use them as passwords, tokens or access checks.
• Pasting production secrets Avoid API keys, tokens, passwords and private customer data unless your own policy allows browser-side handling in this context.
• Expecting every regex engine to match Regex Tester uses the browser JavaScript engine, which can differ from PCRE, Python, Ruby and other engines.

Related developer tools

These are the developer utilities referenced by this chooser.

Related guides

Use these notes for browser-side behaviour and adjacent file tools.

What to try next

Use the next step that matches the question you want to answer.