41 tools · organized by the job they do
Free Developer Tools for Everyday Debugging
Format data, inspect encodings, test expressions and handle common code-adjacent transformations. Browse focused groups, search by outcome and compare adjacent workflows before choosing where to begin.
Suggested starting points
See all 41 Begin with a focused developer task
These editorial selections cover several common entry points without implying usage rankings.
URL Encoder / DecoderTransform url encoder or decoder with clear source and output choices.JSON FormatterPrepare json formatter for a cleaner, more consistent next step.JSON ValidatorCheck json and surface details that need review.JSON MinifierPrepare json minifier for a cleaner, more consistent next step.JSON DiffHandle json diff as part of a focused developer workflow.XML FormatterPrepare xml formatter for a cleaner, more consistent next step.
Complete category catalogue
Explore all 41 developer tools
No tools match those filters. Try a broader phrase or another task group.
JSON, XML & YAML
9Encoding, Hashing & Identifiers
12Regex, Time & Testing
5Code Formatting & Utilities
6Reference & Number-System Tools
9Choose with context
A practical guide to developer tools workflows
The best tool is the one that matches the input, decision and destination—not simply the broadest label.
Validate before transforming
Formatting improves readability but does not guarantee that data follows the expected schema or business rules. Validate JSON, XML or YAML first, review reported locations, then transform a copy. For nested conversions, inspect arrays, attributes, scalar types and ordering assumptions.
Keep secrets out of convenience tools
Encoders are not encryption, a decoded JWT may contain sensitive claims, and hash inputs can reveal valuable information. Browser-local processing is preferable for many utilities, but never paste production credentials, private keys or regulated data into a tool without an approved security path.
Make debugging reproducible
Regex, timestamps, diffs and formatters become more useful when you preserve the exact input and expected output. Note time zones, character encodings, line endings and test cases. Reference tables explain representation; they do not replace protocol or language specifications.
Common outcomes
What you can work on
Tool outputs support review and decision-making. They do not replace professional judgment, source verification or the rules of the platform receiving your work.
Choose a task-specific utility, check the input requirements, and review the result before using it downstream.
Choose a task-specific utility, check the input requirements, and review the result before using it downstream.
Choose a task-specific utility, check the input requirements, and review the result before using it downstream.
Choose a task-specific utility, check the input requirements, and review the result before using it downstream.
Processing should match the task
Catalogue search runs locally in your browser. Functional tools will identify when work can stay browser-local and when a server, authorized public data source or semantic service is necessary. No universal privacy or outcome guarantee is implied.
Continue the workflow
Related categories
Move into adjacent work without losing the context of the task you started.
Helpful answers
Developer Tools questions
Clear guidance for choosing and using the catalogue responsibly.
Does formatting JSON validate it?
A formatter may detect syntax errors, but schema and application-level validation are separate checks.
Is Base64 encryption?
No. Base64 is a reversible encoding and provides no confidentiality.
Can a JWT decoder verify a token?
Decoding reads segments; signature and claim validation require the correct algorithm, key and policy.
What is the difference between a UUID generator and validator?
A generator creates an identifier; a validator checks whether input matches a supported UUID form.
Are MD5 and SHA-1 safe for passwords?
No. Use a purpose-built, salted password hashing scheme through an approved security library.
Why do Unix timestamps appear in different dates?
Tools may interpret seconds versus milliseconds and display different time zones. Confirm both.
Can regex testers prove a pattern is safe?
No. Test representative and adversarial inputs and consider performance and engine-specific behavior.
Will data conversion preserve every type?
Not always. Formats differ in nulls, numbers, dates, ordering, attributes and comments, so inspect the result.
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