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Fast, privacy-friendly developer utilities that run entirely in your browser. No uploads, no tracking, no signups.

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JSON

JSON Formatter

 JSON

JSON Diff

 JWT

JWT Decoder

 CRON

Cron Generator

 ENV

ENV Parser

 BASE64

Base64

 URL

URL Encoder

 UNIX

Unix Timestamp

 UUID

UUID Generator

 REGEX

Regex Tester

 TEXT

Text Case

 USER

User Agent Parser

Latest developer guides

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Long-form posts on debugging, API workflows and the tools we build.

JSON · Debugging

Why JSON Diff Beats Plain Text Comparison

Structural diffs eliminate formatting noise when comparing API responses and nested payloads.

8 min readAPI Debugging
 Auth · Security

JWT Tokens Explained Simply

Header, payload, signature and the security mistakes that keep landing in audits.

10 min readAuthentication
 DevOps · Scheduling

Cron Expressions Explained, With Examples

The five fields, the gotchas, and a reference table of cron expressions you'll actually use.

8 min readDevOps