Developer Tools
Format, encode, decode, test & generate — all client-side.
Most used developer tools
Fast paths for debugging and everyday dev work.
Popular developer workflows
Bundle the small tasks developers usually do together.
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Formatters & Data
Clean up structured data and preview common developer formats
Encoding & Hashing
Encode, decode, and hash values without sending them anywhere
Identity & Auth
Inspect tokens and identity payloads locally
API & HTTP
Debug URLs, requests, and regular expressions
Diff & Compare
Spot text and payload changes quickly
IDs & Tokens
Generate identifiers, slugs, and random tokens
Scheduling & Time
Convert timestamps and build cron expressions
Colour & Design
Convert colors for frontend work
Test Data & QA
Generate realistic data for testing and QA workflows
More Developer Tools
Additional helpers for development workflows.
Free Online Developer Tools — Client-Side & Fast
WebToolVerse offers a comprehensive collection of free developer tools that run entirely in your browser. Format and validate JSON, decode JWT tokens, test regular expressions, convert timestamps, generate UUIDs, encode/decode Base64 and URLs — all without sending your data to any server. Perfect for developers who value speed, privacy, and offline capability.
The JSON formatter validates and pretty-prints JSON with syntax highlighting and error detection. The JWT decoder parses tokens to reveal their header, payload, and signature — useful for debugging authentication issues. The regex tester provides real-time matching with capture group visualization, making it the fastest way to validate and debug regular expressions.
For backend developers, tools like the cURL converter (convert cURL commands to fetch/axios), the CRON expression generator, the SQL query builder, and the HTTP request tester cover everyday tasks. All tools save state in your browser — so your work is there when you come back.
Frequently Asked Questions
Is the JSON formatter safe to use with sensitive data?
Yes — JSON formatting happens entirely in your browser. Your data is never sent to our servers, making it safe for use with API keys, tokens, and private data.
Can I decode JWT tokens here?
Yes. The JWT Decoder shows the header, payload, and signature of any JWT token. Note: always keep your signing secrets private and never share full tokens.
Does the regex tester support all regex flavors?
The regex tester uses JavaScript's native regex engine, which supports most common patterns. Lookaheads, named groups, and Unicode flags are all supported.
Can I use these tools offline?
Yes — install the WebToolVerse PWA and all developer tools work offline. Your data stays in your browser with no internet connection required.
Is there a code formatter for languages other than JSON?
Yes — the Code Formatter supports JavaScript, TypeScript, HTML, CSS, Python, and more using Prettier under the hood.