pastefix
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pastefix

Paste it. Fix it. Understand it.

{ }
JSON Formatter
Format, validate, and fix JSON instantly
/.*/
Regex Tester
Test patterns with real-time matching
$ _
cURL Converter
Convert cURL to Python, JS, Go & more
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JWT Decoder
Decode and inspect JWT tokens
* *
Cron Explainer
Understand any cron schedule
! ?
Error Decoder
Explain any error in plain English
Ctrl+V to paste · Ctrl+Enter to process

How to use

Paste anything into the input area — an error message, JSON, regex pattern, cURL command, JWT token, or cron expression. Pastefix automatically detects what you pasted and routes you to the right tool. Press Ctrl+Enter or click "Process" to analyze your input instantly. You can also jump directly to any tool using the cards below the input.

What this tool does

Pastefix is a free developer toolkit that gives you instant results for the things you paste every day. It formats JSON, tests regex, converts cURL commands, decodes JWTs, explains cron schedules, and decodes error messages — all in your browser, with optional AI-powered explanations for deeper understanding.

Common use cases

  • Quickly formatting and validating JSON from API responses or config files
  • Converting cURL commands from documentation into Python, JavaScript, Go, and 10 more languages
  • Debugging authentication issues by decoding JWT tokens and checking expiration
  • Understanding unfamiliar error messages and stack traces with AI-powered explanations
  • Testing and learning regex patterns with real-time matching and token breakdowns
  • Decoding cron expressions to verify scheduled job timing before deployment

Frequently Asked Questions

Is Pastefix free?

Yes. All six tools are completely free to use with no signup required. AI-powered explanations are also free during our launch period.

Is my data private?

All static tool processing (formatting, decoding, parsing, validation) happens entirely in your browser. Your data never leaves your device. Only the optional "Explain with AI" feature sends data to a server for analysis, and we do not log or store your input.

What makes Pastefix different from other developer tools?

Pastefix combines six essential tools in one place with a unique auto-detect feature — just paste and go. Unlike single-purpose tools, you do not need to know which tool you need. Plus, every tool includes optional AI explanations that go beyond basic formatting to help you actually understand your data.

Does Pastefix work offline?

The core tools (JSON formatter, regex tester, JWT decoder, cron explainer, and cURL parser) work with no internet connection since they run in your browser. AI explanations require an internet connection.