DevEngineerLab is a local-first developer workspace for inspecting, transforming, and validating the everyday data that moves through your systems. Your inputs stay in your browser whenever possible, with predictable outputs and no account required.

Ship with confidence.
Debug with clarity.

Tools that stay out of your way.

JSON & Data

JSON Formatter

JSON Validator

JSON ↔ YAML Converter

Developer Utilities

Base64 Encode & Decode

UUID Generator

Timestamp Converter

Regex Tester

JWT Decoder

Text Diff

API Tools

REST API Tester

cURL Parser

cURL Generator

cURL → Code Converter

API Response Diff

HTTP & Request Debugging

HTTP Request Builder

Schema & Configuration

JSON Schema Validator

OpenAPI Validator

.env Validator

OpenAPI Mock Data Generator

Webhook Tools

Webhook Payload Inspector

Webhook Signature Validator

Small utilities.
Serious craft.

Ship with confidence.Debug with clarity.