Developer tools

Online developer tool collection

Practical browser-based utilities for front-end, back-end, mobile, testing and operations workflows. Core processing stays on your device.

Developer tools

Data & JSON

18 tools

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JSON Formatter

Format, validate and minify JSON data

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JSON Diff

Compare two JSON documents by key path

→$.

JSONPath Tester

Query JSON nodes and values with path expressions

→JS

JSON Schema Validator

Validate JSON structure and field rules against a schema

→FX

JSON Repair

Fix common JSON quote, comma and property errors

→YA

YAML JSON Converter

Convert, validate and format YAML and JSON

→TO

TOML JSON Converter

Convert, parse and format TOML and JSON

→XM

XML JSON Converter

Convert XML and JSON while preserving attributes and nodes

→TS

JSON to TypeScript

Generate TypeScript interfaces from JSON

→JV

JSON to Java

Generate Java POJOs and Jackson field mappings from JSON

→PY

JSON to Python

Generate Python Pydantic models from JSON

→GO

JSON to Go Struct

Generate Go structs and json tags from JSON

→C#

JSON to C#

Generate C# classes and System.Text.Json mappings

→KT

JSON to Kotlin

Generate Kotlin data classes from JSON

→SW

JSON to Swift

Generate Swift Codable structs from JSON

→DT

JSON to Dart

Generate Dart and Flutter model classes from JSON

→RS

JSON to Rust

Generate Rust structs and Serde mappings from JSON

→CSV

CSV to JSON

Convert CSV tables into JSON arrays

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Developer tools

Encoding

2 tools

Base64 Encoder

Encode or decode Base64 text instantly

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URL Encoder

Encode and decode special URL characters

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Developer tools

Generators

1 tools

UUID Generator

Generate secure UUID v4 values in bulk

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Developer tools

Web front-end

4 tools

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HTML Formatter

Beautify or minify HTML markup

→#

CSS Formatter

Format or minify CSS styles

→◉

Color Converter

Convert HEX colors to RGB and HSL

→>

cURL Converter

Convert cURL commands to Fetch or Axios

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Developer tools

Text

4 tools

Regex Tester

Test expressions, flags and match positions

→±

Text Diff

Compare two texts line by line

→MD

Markdown Preview

Write and preview common Markdown syntax

→Aa

Case Converter

Convert camelCase, snake_case and more

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Developer tools

Time & scheduling

2 tools

◷

Timestamp Converter

Convert Unix timestamps to local dates

→CR

Cron Parser

Validate and explain five-field cron syntax

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Developer tools

Security & hashes

3 tools

JWT

JWT Decoder

Inspect JWT headers and payloads

→SHA

Hash Generator

Generate SHA-1, SHA-256 and SHA-512 digests

→***

Password Generator

Create configurable secure random passwords

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Developer tools

Images & media

2 tools

B64

Image Base64 Converter

Convert images and Base64 Data URLs both ways

→IMG

Image Converter

Convert PNG, JPEG and WebP locally

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