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100+ Developer Tools

Online Developer Tools — Format, Convert, Encode, Validate

100+ free developer tools — JSON formatter, YAML converter, API client, regex tester, and more. No sign-ups, no limits, just results.

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Client-Side Only

All processing happens in your browser. Your data never leaves your device.

No Sign-Ups

Use any tool instantly. No accounts, no API keys, no friction.

Lightning Fast

Built for instant browser-based processing — no server round trips.

Popular

Tools developers use daily

Fast, focused utilities that handle the everyday tasks without the hassle.

ER Diagram Generator

Transform database schemas into beautiful, interactive Entity Relationship Diagrams.

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AI Prompt Generator

Craft perfect prompts for ChatGPT, Claude, and other LLMs with built-in templates.

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JSON to Code

Convert JSON into TypeScript interfaces, Go structs, Python classes, and more.

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All Tools

Complete collection of utilities

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AI Prompt Generator

LLM Token Counter

Ls Command Builder

Find Command Builder

Locate Command Builder

Tar Command Builder

Grep Command Builder

Cut Command Builder

Sort Command Builder

Awk Command Builder

Sed Command Builder

Nmap Command Builder

Curl Command Builder

SSH Command Builder

Ping Command Builder

SS Command Builder

PS Command Builder

REST API Client

OpenAPI Editor

Regex Tester

JSON to Code Generator

XML to Code Generator

YAML to Code Generator

JSON Pipeline Builder

JSON Flatten / Unflatten

JSON Formatter

JSON Diff

JSON Minifier

JSON Fix

JSON To XML

JSON To YAML

JSON To CSV

String To JSON

JSON Schema GUI Builder

JSON Validator

JSON To TOML

JSON to String

JSON to TSV

JSON Sorter

JSON Escape / Unescape

JSONPath Explorer

CSV To JSON

CSV To YAML

CSV To XML

SchemaCode ER Diagram Generator

XML Formatter

XML Validator

XML Minifier

XML To JSON

XML To YAML

XML To CSV

XML To TOML

YAML Formatter

YAML To JSON

YAML To XML

YAML Validator

YAML To CSV

YAML To TOML

JSON to Java Properties

Java Properties To JSON

YAML To Java Properties

Java Properties To YAML

JSON to .env

YAML to .env

.env to JSON

.env to YAML

JSON to Bash

YAML to Bash

Bash Properties to JSON

Bash Properties to YAML

JSON to Python Dict

YAML to Python Dict

Python Dict to JSON

Python Dict to YAML

JSON to INI (Python)

YAML to INI (Python)

INI (Python) to JSON

INI (Python) to YAML

JSON to PHP Array

YAML to PHP Array

PHP Array to JSON

PHP Array to YAML

JSON to PHP INI

YAML to PHP INI

PHP INI to JSON

PHP INI to YAML

TOML To JSON

TOML To YAML

TOML To XML

Base 64 Encoder

Base 64 Decoder

Base 64 Converter

Base 64 to Image

Timestamp Converter

Cron Helper

Age Calculator

JWT Encoder

JWT Decoder

UUID v1 Generator

UUID v3 Generator

UUID v4 Generator

UUID v5 Generator

UUID v7 Generator

GUID Generator

ULID Generator

URL Encoder

URL Decoder

JSON URL Encoder

JSON URL Decoder

XML URL Encoder

XML URL Decoder

YAML URL Encoder

YAML URL Decoder

Sort Lines

Remove Duplicates

Word Counter

Character Counter

Line Counter

Duplicate Counter

Spaces to Newlines

Sort Words

String Case Converter

Frequently Asked Questions

Is my data really private?
Absolutely. All processing happens in your browser using JavaScript and WebAssembly. We have no servers processing your data, and no analytics tracking your inputs.
Can I use these tools offline?
Yes! Install LangStop as a Progressive Web App (PWA) and all tools work without an internet connection.
Are there usage limits?
None. Unlike API-based tools, our client-side approach means you can process gigabytes of data limited only by your device's memory.

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