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Developer Tools

Encode, decode, format, and validate

Essential developer utilities that save you time every day. Format and validate JSON with syntax highlighting, encode and decode Base64 strings, generate UUIDs, hash text with MD5/SHA algorithms, inspect JWT tokens, and compare text with our diff checker. Whether you're debugging API responses, encoding data for transport, or validating configuration files, these tools run entirely in your browser with zero setup required.

{}

JSON Formatter & Validator

Format, validate, and beautify JSON data with syntax highlighting

B64

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to plain text

URL Encoder / Decoder

Encode or decode URL components and query strings

HTML Entity Encoder / Decoder

Encode special characters to HTML entities or decode them back

UUID Generator

Generate random UUIDs (v4) in bulk with one click

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text

JWT

JWT Decoder

Decode and inspect JSON Web Tokens — view header, payload, and expiry

All Developer Tools on ToolsFuel

JSON Formatter & Validator — Format, validate, and beautify JSON data with syntax highlighting

Base64 Encoder / Decoder — Encode text to Base64 or decode Base64 back to plain text

URL Encoder / Decoder — Encode or decode URL components and query strings

HTML Entity Encoder / Decoder — Encode special characters to HTML entities or decode them back

UUID Generator — Generate random UUIDs (v4) in bulk with one click

Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text

JWT Decoder — Decode and inspect JSON Web Tokens — view header, payload, and expiry