Utilities for developers, designers, and technical users. Format, decode, convert, and test — all in your browser with zero configuration.
Format, validate, beautify, and minify JSON. Detect syntax errors instantly with line-level highlighting.
Decode and inspect JSON Web Tokens. View header, payload, and signature. Verify expiry claims.
Generate and test regular expressions with real-time matching. Includes common patterns library.
Encode or decode URLs and query strings. Handles percent-encoding and special characters.
Convert cURL commands to code in multiple languages: Python, JavaScript, PHP, Go, and more.
Convert Markdown to clean, valid HTML. Preview rendered output in real time.
Generate mock REST API responses with realistic sample data for front-end development.
Test HTTP response headers and status codes for any URL. Debug CORS, caching, and redirect chains.
Convert Unix timestamps to human-readable dates and vice versa. Supports multiple formats and timezones.
Development workflows are full of small, repetitive tasks: formatting an API response to read it, decoding a JWT to check its claims, testing whether a URL is properly encoded, or converting a cURL command from documentation into actual code. These tasks are too small to justify a dedicated app, yet tedious enough to slow you down.
Browser-based tools solve this perfectly. They're available instantly from any machine — no installation, no configuration, no dependencies. For developers working across multiple environments (local, staging, CI, client machines), this is invaluable. All DocsConverter developer tools run 100% client-side, meaning sensitive tokens, API responses, and private data never touch any external server.
Unlike some online tools that log your input for "service improvement", DocsConverter's tools process everything in your browser's JavaScript engine. Close the tab and it's gone.
What is JSON and why do I need a JSON formatter?
JSON (JavaScript Object Notation) is a lightweight data-interchange format. Minified JSON is hard to read — a formatter adds proper indentation and line breaks, making it easy to inspect and debug. A validator also catches syntax errors like missing commas or mismatched brackets.
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It consists of three Base64URL-encoded parts separated by dots: Header.Payload.Signature. Our decoder reveals the header algorithm, payload claims (like user ID and expiry), and helps debug auth issues.
Is it safe to decode JWTs in a browser tool?
Yes — our JWT Decoder works entirely in your browser. Your token is never sent to any server. However, never share JWTs containing sensitive claims with anyone. After debugging, invalidate tokens if they may have been exposed.
What is a Unix timestamp?
A Unix timestamp is the number of seconds elapsed since January 1, 1970, 00:00:00 UTC (the Unix Epoch). It's used extensively in programming as a timezone-agnostic, language-agnostic way to represent moments in time.
Can I test CORS headers with the Headers Tester?
Yes. The Headers Tester shows all response headers including Access-Control-Allow-Origin, Access-Control-Allow-Methods, and other CORS-related headers, helping diagnose cross-origin request issues.