Dev Tools

Developer Tools

Format JSON, encode Base64, decode JWTs, test regex, generate hashes, and convert colors — private client-side tools for developers.

Beautify a JSON API response
No uploads
Client-side processing
No sign-up
6Available tools
0Uploads
100%Private

Popular workflows

Common tasks

Start with practical workflows users run most in this category.

Beautify a JSON API response

Paste minified JSON to instantly format and syntax-highlight it — validate structure and spot errors.

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Inspect an authentication token

Paste a JWT to decode header and payload fields, check expiry, and read claim values without any backend.

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Test a validation regex

Write your pattern, paste sample input, and see match highlights and capture groups update in real time.

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Encode or decode Base64

Convert text strings or binary data to Base64 and back — useful for data URIs, tokens, and API payloads.

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Generate a SHA-256 checksum

Paste any text and get its MD5, SHA-1, SHA-256, or SHA-512 hash for integrity verification.

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Convert a color code

Paste a HEX, RGB, or HSL value and instantly get it in all other formats — copy for CSS or design tools.

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Full toolkit

All developer tools

Pick a tool to get started — everything runs locally in your browser.

JSON Formatter
Paste raw or minified JSON to instantly beautify, validate, and highlight syntax errors.
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Base64 Tool
Encode plain text or decode Base64 strings instantly — supports URL-safe encoding too.
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Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for any text input — useful for checksums and integrity checks.
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JWT Decoder
Decode JWT header and payload fields and inspect expiry, issuer, and claims — nothing leaves your browser.
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Regex Tester
Write a pattern, paste sample text, and see live match highlighting with capture group detail.
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Color Tools
Convert colors between HEX, RGB, HSL, and OKLCH — copy any format for use in CSS or design tools.
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Guides & privacy

How to choose the right tool

  • Use JSON Formatter first to make minified API responses readable before you start debugging nested structures.
  • Use Regex Tester to write and validate patterns against real input before hardcoding them in code.
  • Use Hash Generator for quick checksum comparisons — useful for verifying downloads or API webhook signatures.
  • Use Base64 Tool when working with data URIs, binary encoding in configs, or basic obfuscation checks.
  • Use JWT Decoder to audit token claims during local development without sending tokens to any third-party tool.

Privacy and safety

All encoding, decoding, hashing, and token inspection runs in your browser with no backend transmission. Tokens, secrets, and sensitive API payloads never leave your device.

Category FAQs

Is it safe to paste JWTs into an online tool?

With UtilSnap, yes — JWT decoding runs entirely client-side in JavaScript. Your token is never sent to a server. That said, avoid pasting production tokens with real credentials in any public environment.

Can I test regex against large text blocks?

Yes. Paste any sample text into Regex Tester and matches will highlight in real time. The tool handles multi-line input with global and case-insensitive flags.

What hash algorithms are supported?

The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512 — all computed client-side using the Web Crypto API.

Does JSON Formatter handle deeply nested or large responses?

Yes. The formatter handles typical API responses up to several MB. Very large files may be slow to render due to browser memory limits.