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New local tools

Featured Developer Tools

Local-first tools for modern APIs, configuration, delivery, and network operations.

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Database Performance MySQL EXPLAIN Analyzer

Reliability Engineering SLO Error Budget & Burn Rate Calculator

Recurring Schedules RRULE Builder & Recurrence Preview

Route Planning IPv4 CIDR Set Analyzer & Route Summarizer

Event Interoperability CloudEvents Validator & HTTP / JSON Converter

Observability OpenTelemetry Trace Context Inspector

Infrastructure Review Terraform Plan JSON Explorer

Configuration TOML Formatter & JSON Converter

API Contracts Protobuf & gRPC Inspector

Event APIs AsyncAPI Validator

Local Data SQLite Schema Inspector

JavaScript Delivery package.json Inspector

JavaScript Delivery npm / pnpm / Yarn Lockfile Analyzer

Supply Chain CycloneDX / SPDX SBOM Viewer

Build Debugging Source Map Explorer

Network Planning IPv6 CIDR Calculator

Email Delivery SPF / DMARC / DKIM Analyzer

JSON Tools

JSON Formatter
JSON → TypeScript, Zod & Pydantic
Mock Data Generator
Data Lab: CSV / JSON / Parquet SQL
NDJSON Inspector
Data Recipe Studio
JSON Schema Form Builder
JSON-LD Schema Inspector
Protobuf & gRPC Inspector
AsyncAPI Validator
CloudEvents Validator & HTTP / JSON Converter
API Collection Converter
HTTP Request Builder
GraphQL Explorer & Query Validator
OpenAPI Test Case Generator
LLM Structured Output Builder
JSON Diff & Patch
JSONPath Tester
JSON Formatter (Vertical)
JSON Formatter (Side-by-side)
JSON Minify & Escape
JSON to C# Class
JSON to Java Class
JSON to Go Struct
SQL to Java Class
JSON ↔ XML
CSV / Excel to JSON
JSON to CSV / Excel
JSON ↔ Query Parameters
JSON to YAML

Format & Convert

Encoding & Crypto

API & Security

OpenAPI Explorer
OpenAPI Validator
OpenAPI Diff & Breaking Changes
OpenAPI Docs Studio
API Response Validator
JSON Schema Validator
JWT Inspector & Generator
JWT / JWK Pro Verifier
OIDC Config & PKCE
PEM / Certificate / JWK Inspector
Webhook Signature Tester
CSP & Security Headers
CORS Preflight Analyzer
API Request Security Check
Data Masker & PII Redaction
cURL ⇄ Fetch ⇄ Axios
HTTP Header Reference
JSON Formatter

Text & Numbers

HTML Editor
Content Extractor
Text Replace
Text Diff
Word Count
Vertical Text
Text Flip
Duplicate Content Check
Text Effects
String Minifier
Camel Case ↔ Snake Case
Full-width / Half-width Converter
Letter Case Converter
Random Number Generator
Unix Timestamp Converter
Base Converter
RGB Color Converter

Network

IP Geolocation Lookup
WebSocket Tester
Browser Information
Public DNS
IPv6 CIDR Calculator
SPF / DMARC / DKIM Analyzer
OpenTelemetry Trace Context Inspector
IPv4 CIDR Set Analyzer & Route Summarizer
US DNS

Web Ops

Calculators

Interest Calculator
Subnet Mask Calculator
Scientific Calculator
Area Converter
Heat Converter
Volume Converter
Pressure Converter
Power Converter
Length Converter
Temperature Converter
Time Converter
Speed Converter
Angle Converter
Data Size Converter
Density Converter
Force Converter

Utilities

Online Drawing Board
Online Clock
World Time
World Capitals
World Currencies
Country Codes & Time Zones
World Holidays
Special Characters
Today in History

Reference

Common User-Agent
Content-Type Reference
HTTP Request Methods
HTTP Header Reference
HTTP Status Codes
ASCII Reference
HTML Character Escapes
Common Ports
Bootstrap Icons
Android Manifest Permissions
Common Linux Commands

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