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WebUtilsLab Developer Tools

Free Local-First Developer Utilities

Focused debugging helpers for developers who need fast browser-side checks without a dashboard or account. Useful for JavaScript regex work, API debugging, log inspection, and quick transformations while staying close to the core developer workflow.

Developer Utilities tools

Developer Utilities

Regex Tester

Test JavaScript regular expressions locally with matches, capture groups, flags, and replacement preview.

  • Match and capture group table
  • Replacement preview
Open Regex Tester
Developer Utilities

JSON Escape / Unescape

Escape JSON strings for source code, logs, and API payloads, or unescape quoted JSON text back into readable content.

  • Escape or unescape JSON strings
  • Readable and quoted output modes
Open JSON Escape
Developer Utilities

JSON to TypeScript Interface

Infer TypeScript interfaces from JSON samples locally with optional fields, arrays, nested objects, and copy-ready output.

  • Nested interface inference
  • Optional fields and arrays
Open JSON to TypeScript

Recommended developer workflow

  1. Use Regex Tester to confirm match behavior, capture groups, and replacement output before moving code into JavaScript.
  2. Combine regex checks with JSON Formatter or URL Encoder when extracting fields from logs, payloads, or query strings.
  3. Use related Encoding and Data tools when a matched value needs decoding, comparison, or structured output.

Related categories

Move between related WebUtilsLab tool categories when a task crosses formats, encoding, scheduling, or implementation checks.

Data Encoding Time

When to use these Developer Utilities tools

Pattern debugging

Test JavaScript regex behavior against realistic text before moving a pattern into application code or log tooling.

Code-adjacent transforms

Escape JSON strings, infer TypeScript types, and prepare small snippets for source files, tests, or docs.

API troubleshooting

Pair developer utilities with Data and Encoding tools when raw responses, query strings, or tokens need inspection.

Developer Utilities tools FAQ

Which tasks belong in Developer Utilities?

Use this category for regex testing, JSON string escaping, TypeScript interface generation, and other code-focused text checks.

Does Regex Tester use JavaScript regex rules?

Yes. The regex tester is designed around JavaScript regular expressions, flags, matches, capture groups, and replacement previews.

Where should I go for JSON, URLs, or encoded tokens?

Use Data tools for JSON, CSV, YAML, and XML. Use Encoding tools for URLs, Base64, JWTs, UUIDs, and hashes.