New Developer Tools
7 powerful utilities for everyday development workflows
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Overview
These 7 new developer tools are standalone pages designed for everyday coding tasks. Each tool focuses on a single purpose with a clean interface, real-time feedback, and the ability to copy or download results. Most processing happens entirely in your browser, keeping your data private.
All tools are accessible from the Dev Tools Hub or directly via their individual routes listed below. No sign-up or account is required.
JSON Formatter & Validator
Paste raw JSON, format and beautify it with configurable indentation, validate its structure with detailed error detection, and view statistics about your data.
Route: /tools/developer/json-formatter
How to Use
- 1
Paste your JSON into the input editor. The tool accepts any valid or invalid JSON string for validation.
- 2
Choose your indent size from the available options: 2 spaces, 4 spaces, 8 spaces, or tabs.
- 3
Click "Format" to beautify the JSON. If there are syntax errors, the tool highlights the exact location and provides a descriptive error message.
- 4
Review the stats panel showing total keys, nesting depth, and data size of your JSON.
- 5
Copy or download the formatted output using the action buttons.
Features
- Format and beautify JSON with configurable indentation
- Validate JSON with precise error location and messages
- View stats: total keys, nesting depth, and data size
- Copy to clipboard or download as a .json file
Base64 Encode/Decode
Encode text to Base64 or decode Base64 strings back to plain text. Also supports file-to-Base64 conversion for generating data URLs.
Route: /tools/developer/base64-encoder
How to Use
- 1
Choose your mode - select "Text" for string encoding/decoding or "File" for file-to-Base64 conversion.
- 2
In text mode: enter your text in the left panel. Toggle between "Encode" and "Decode" directions, or use the swap button to reverse input and output.
- 3
In file mode: upload a file and receive its Base64 data URL representation, ready for embedding in HTML or CSS.
- 4
Copy the result from the output panel using the copy button.
Features
- Two-column input/output layout for easy comparison
- Encode/decode toggle with instant swap button
- File upload mode for generating Base64 data URLs
- All processing happens entirely in your browser
JWT Decoder
Decode JSON Web Tokens to inspect their header, payload, and expiration status without needing external services.
Route: /tools/developer/jwt-decoder
How to Use
- 1
Paste your JWT token into the input field. The token should have the standard three-part format (header.payload.signature).
- 2
View the decoded header showing the algorithm (e.g., HS256, RS256) and token type.
- 3
Inspect the payload with all claims displayed in a formatted view, including subject, issuer, issued-at, and expiration timestamps.
- 4
Check expiration status - the tool automatically indicates whether the token is still valid or has expired.
Features
- Decoded header and payload displayed in formatted JSON
- Automatic expiration status check
- Token details: subject, issuer, issued at, and expires at
- No server communication - your tokens stay private
This tool only decodes JWT tokens. It does not verify signatures. Never paste production tokens containing sensitive data into any online tool.
HTML/CSS/JS Minifier
Minify HTML, CSS, or JavaScript code to reduce file size. View the original size versus minified size alongside the savings percentage.
Route: /tools/developer/minifier
How to Use
- 1
Select the language tab - choose between HTML, CSS, or JavaScript depending on the code you want to minify.
- 2
Paste your code into the input area. There is no strict size limit, though very large files may take a moment to process.
- 3
Click "Minify" to process the code. The minified output appears below with a size comparison showing original size, minified size, and percentage saved.
- 4
Copy or download the minified output using the action buttons above the result.
Features
- Tab-based interface for HTML, CSS, and JavaScript
- Original vs. minified size comparison with savings percentage
- Removes whitespace, comments, and unnecessary characters
- Copy to clipboard or download the minified file
UUID Generator
Generate cryptographically random UUID v4 identifiers with bulk generation support, multiple format options, and a built-in UUID validator.
Route: /tools/developer/uuid-generator
How to Use
- 1
Click "Generate" to create a new UUID v4 using the browser's
crypto.randomUUID()API. - 2
For bulk generation, set the quantity (up to 100 UUIDs at once) and click generate. All results appear in a scrollable list.
- 3
Choose a format: standard (with dashes), no dashes, or uppercase. The output updates automatically based on your selection.
- 4
Validate a UUID by pasting it into the validator input to check whether it conforms to the UUID format.
Features
- Cryptographically secure UUID v4 generation
- Bulk generation of up to 100 UUIDs at once
- Format options: standard, no dashes, uppercase
- Built-in UUID validator
API Tester
Send HTTP requests to any API endpoint and inspect the response. Requests are proxied through the server to avoid CORS restrictions, so you can test any public API directly from your browser.
Route: /tools/developer/api-tester
How to Use
- 1
Select the HTTP method from the dropdown: GET, POST, PUT, PATCH, or DELETE.
- 2
Enter the URL of the API endpoint you want to test (e.g.,
https://jsonplaceholder.typicode.com/posts). - 3
Configure headers and body as needed. Add custom headers (e.g., Authorization, Content-Type) and a request body for POST/PUT/PATCH requests.
- 4
Click "Send" to execute the request. The response panel shows the HTTP status code, response timing, headers, and body content.
Features
- Supports GET, POST, PUT, PATCH, and DELETE methods
- Custom headers and request body configuration
- Server-side proxy to bypass CORS restrictions
- Response details: status code, timing, headers, and body
Requests are routed through a server-side proxy to avoid browser CORS restrictions. Avoid sending sensitive credentials such as API keys through this tool in production environments.
Regex Tester (Standalone)
A full-page version of the regex tester with all the same features as the Dev Tools Hub version. Test regular expression patterns against sample text, visualize matches, and explore captured groups.
Route: /tools/developer/regex-tester
How to Use
- 1
Enter your regex pattern in the pattern input field. No need to wrap it in slashes - just type the pattern directly.
- 2
Set flags using the flag checkboxes: global (g), case insensitive (i), multiline (m), dotAll (s), and unicode (u).
- 3
Enter test text in the textarea. Matches are highlighted in real-time as you type both the pattern and the test string.
- 4
Review results - see the total match count, captured groups, and detailed token explanations for each part of your pattern.
Features
- Full-page layout with more space for complex patterns
- Real-time match highlighting as you type
- Captured group display with detailed token explanations
- Same functionality as the Dev Tools Hub regex tester
Tips & Best Practices
JSON Formatter: Use the stats panel to quickly understand the structure and size of unfamiliar JSON data before diving in.
Base64: File mode is great for embedding small images directly in CSS or HTML without extra network requests.
JWT Decoder: Always check the expiration timestamp when debugging authentication issues - an expired token is the most common cause of 401 errors.
Minifier: Compare the savings percentage across HTML, CSS, and JS to identify which files benefit most from minification in your project.
UUID Generator: Use the bulk generation feature when seeding databases or creating test fixtures that require unique identifiers.
API Tester: Start with a simple GET request to verify connectivity before adding headers and body payloads for more complex requests.
Regex Tester: Enable the global (g) flag to find all matches instead of stopping at the first one.
All tools process data in your browser by default. The only exception is the API Tester, which routes requests through a server-side proxy to avoid CORS issues.