devkit — Free Developer Tools Suite

A hosted suite of developer tools. Inspect webhooks in real time, find/replace in plain or regex, diff JSON documents.

Free, open, and works without an account.

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All Tools

Webhook Tester

Get a temporary URL, send any HTTP request, and inspect the response with live updates.

String Replacer

Find/replace in plain text or with regex. Case insensitive, multiline, and dotAll flags.

JSON Compare

Structural diff between two JSON documents. Ignore object key order, configurable array order.

Regex Tester

Test regular expressions interactively. Highlight matches and groups in real time.

Text Diff

Line-by-line comparison of two text inputs. Unified or side-by-side diff output.

Base64 Encoder

Encode/decode Base64, URL-encoded strings, and images to data URIs.

Hash / HMAC

Generate MD5, SHA-1, SHA-256, SHA-512 hashes and HMAC signatures from text input.

JWT Decoder

Decode and inspect JWT headers, payload, and signature. Check expiration and claims.

JWT Encoder

Build and sign HS256 JWTs from a header, payload, and secret.

JSON Formatter

Pretty-print JSON with syntax highlighting and optional minification.

JSON Encoder

Escape a string to a JSON string or unescape a JSON string back to raw text.

UUID / ULID

Generate UUID v1/v4/v7 and ULID identifiers. Batch generation supported.

Timestamp

Convert between Unix timestamps and human-readable dates. UTC and local timezones.

Cron Parser

Parse cron expressions and see next scheduled execution times.

Why devkit?

No Account Required

All tools run directly in your browser. Zero data is sent to any server. You can start using every tool immediately without signing up.

Privacy First

Client-side tools process your data locally. Webhook payloads are transient and automatically expire. No analytics, no tracking, no selling your data.

Free and Open

Every tool is free to use with no paywalls or premium tiers. Built with Go and TypeScript, deployed as a single binary. Rate limits are generous.

Developer tools should be fast, private, and accessible. devkit brings together the utilities you reach for every day — from inspecting webhook payloads and testing regex patterns to comparing JSON structures and converting timestamps — in one consistent interface with a clean, dark-themed design that stays out of your way.

No account needed. All tools run directly in your browser.