Developer tools
Developer tools for JSON, Base64, JWT, URLs, DNS, HTTP status codes, and code formatting.
JSON Formatter
Format, validate, and minify JSON.
JSON Validator
Validate JSON and find syntax errors.
JSON to YAML
Convert JSON data into YAML.
YAML to JSON
Convert YAML data into JSON.
Base64 Encoder
Encode text or data to Base64.
Base64 Decoder
Decode Base64 back to readable text.
URL Encoder
Encode strings for safe URL usage.
URL Decoder
Decode URL-encoded strings.
HTML Escape
Escape or unescape HTML entities.
JWT Decoder
Decode JWT headers and payloads without verification.
Hash Generator
Create SHA hashes for text values.
Timestamp Converter
Convert Unix timestamps to dates and back.
Regex Tester
Test regular expressions against sample text.
Cron Parser
Read cron expressions and preview schedules.
UUID Validator
Validate UUID strings and detect versions.
DNS Lookup
Inspect DNS records for a domain.
HTTP Status Codes
Search HTTP status codes and meanings.
Color Converter
Convert HEX, RGB, HSL, and CSS colors.
CSS Minifier
Minify CSS for smaller stylesheets.
JavaScript Formatter
Format JavaScript snippets for readability.
SQL Formatter
Format SQL queries with consistent indentation.
Popular tasks
Check integration signals
How to choose a developer tool
Use this section to choose the right utility for JSON, Base64, JWT, timestamps, regex, DNS, HTTP status codes, and code formatting. Local tools run in the browser; network checks such as DNS Lookup clearly show when an external request is needed.
How to choose a developer tool
- JSON Formatter - when JSON needs readable formatting, validation, or minification.
- JWT Decoder - when you need to inspect a token header and payload without verifying the signature.
- Regex Tester - when a regular expression needs to be tested against examples before it goes into code.
- DNS Lookup - when you need DNS records for a domain; this is a network request, not local processing.
What you can do
- Validate and transform data: JSON, YAML, Base64, URL-encoded strings, HTML entities, and JWT.
- Inspect values from logs and integrations: timestamps, UUIDs, hashes, cron expressions, HTTP codes, and DNS records.
- Prepare code snippets or queries by formatting JavaScript, SQL, CSS, and spotting format problems quickly.
Formats and limits
- JSON, YAML, Base64, URL, HTML, and JWT tools work best with focused snippets you can safely paste into the tool.
- JWT Decoder shows token contents, but it does not verify the signature or prove that a token is trustworthy.
- DNS Lookup makes an external network request for the domain; do not treat it as a full infrastructure availability check.
Data and processing
Why processing mode matters for developer data
- Logs and payloads can contain tokens, emails, internal URLs, environment values, and other sensitive details.
- Local developer tools process pasted text in your browser and do not send it to Utilio servers.
- Network request tools show their mode separately because they need to contact an external resource.
Common questions
Are developer tools in this category local?
Most developer utilities parse or format pasted data in your browser. Tools that need a network lookup, such as DNS Lookup, make that mode visible before you run them.
Which developer tool should I choose?
Choose by data type: JSON and YAML tools for structured data, Base64 and URL tools for encoding, JWT for token inspection, timestamp tools for dates, and DNS tools for public records.
Should I paste secrets into browser developer utilities?
Avoid pasting secrets unless you have checked the tool mode and removed sensitive values. Local tools do not upload content to Utilio, but browser extensions, shared devices, and copied logs can still be risky.