Free Online Developer Tools

Format JSON, convert files and text, decode tokens, generate IDs, test regular expressions, and handle everyday web development tasks in one fast browser-based workspace.

AllConvertersFormattersSecurityDevOps

Converters

JSON to TypeScript

Paste JSON and generate TypeScript interfaces.

Converters

JSON to YAML

Convert JSON to YAML, or YAML back to JSON.

Converters

cURL to Code

Turn cURL commands into Fetch, Axios, or Python code.

Converters

SQL Formatter

Format or minify SQL queries for easier reading.

Converters

Markdown to HTML

Preview Markdown and copy clean HTML output.

Formatters

JSON Formatter

Format, validate, or minify JSON without leaving the page.

Formatters

Text Diff Checker

Compare two text blocks and see changed lines.

Formatters

Regex Tester

Test JavaScript regex patterns against sample text.

Formatters

String Case Converter

Convert text to camelCase, snake_case, kebab-case, and more.

Formatters

HTML/XML Formatter

Format or minify HTML and XML markup.

Security

JWT Decoder

Read the header and payload of a JSON Web Token.

Security

Base64 Encoder/Decoder

Encode text and images to Base64, or decode Base64 text.

Security

URL Encoder/Decoder

Encode and decode URLs, query strings, and URI text.

Security

Hash Calculator

Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes.

Security

Bcrypt Generator

Generate bcrypt hashes and verify password matches.

DevOps

Timestamp Converter

Convert Unix timestamps to dates and dates to timestamps.

DevOps

Cron Generator

Build cron expressions and see the next run times.

DevOps

Docker to Compose

Convert docker run commands to Docker Compose YAML.

DevOps

Chmod Calculator

Calculate Linux chmod numbers and file permissions.

DevOps

UUID Generator

Generate one UUID or many UUIDs for tests and apps.

Formatters

SQL Validator

Check SQL syntax and catch common query risks before running it.

Converters

XML to CSV

Convert XML records into CSV with nested field flattening.

Converters

Morse Code Converter

Convert text to Morse code, decode Morse, and play the signal.

Security

JWT Generator

Create signed JSON Web Tokens for API and auth testing.

Converters

CSV Viewer

Open, search, sort, and preview CSV files in your browser.

Formatters

JS Validator

Validate JavaScript, JSX, TypeScript, and TSX snippets.

Formatters

YAML Validator

Validate YAML syntax and preview parsed YAML as JSON.

Formatters

XML Validator

Validate XML syntax, inspect structure, and format XML.

Formatters

Regex Generator

Generate regex patterns from common templates and examples.

Formatters

JSON Viewer

Explore, search, and validate JSON as a collapsible tree.

Converters

JSON to CSV

Convert JSON arrays and nested objects into CSV or TSV.

Converters

XML to JSON

Convert XML documents into nested JSON with attributes.

Security

URL Parser

Parse URLs into components and decoded query parameters.

Formatters

HTML Entities

Encode or decode HTML entities and special characters.

DevOps

User Agent Parser

Decode browser, OS, device, engine, and bot details.

Converters

Color Converter

Convert colors between HEX, RGB, HSL, and CSS values.

Security

Query String Parser

Parse query strings into decoded parameters and JSON.

DevOps

UTM Builder

Create campaign tracking URLs with UTM parameters.

Formatters

Text Statistics

Count words, characters, lines, reading time, and top words.

DevOps

UUID Validator

Validate UUID/GUID values and inspect version and variant.

Converters

CSV to JSON

Convert CSV, TSV, and delimited text into JSON.

Converters

YAML to JSON

Convert YAML documents into formatted JSON.

Security

URL Validator

Validate URLs and inspect protocol, host, path, and query parts.

DevOps

HTTP Status Codes

Look up HTTP status code meanings and response classes.

Formatters

HTML Previewer

Preview HTML snippets in a sandboxed browser frame.

Formatters

CSS Validator

Validate CSS syntax with csstree and inspect rules.

Formatters

CSS Formatter

Format or minify CSS stylesheets and snippets.

DevOps

QR Code Generator

Generate QR codes for URLs, text, Wi-Fi, and contact data.

Formatters

SVG Viewer

Preview sanitized SVG markup and inspect basic details.

DevOps

JSON Generator

Generate mock JSON from JSON Schema examples.

Formatters

HTML Validator

Validate HTML syntax, structure, and common markup issues.

Formatters

CSV Validator

Validate CSV rows, delimiters, headers, and quoted fields.

Formatters

JavaScript Minifier

Minify JavaScript snippets with Terser.

Security

Password Generator

Generate strong random passwords with Web Crypto.

Converters

HTML to Markdown

Convert HTML snippets into Markdown.

DevOps

Cron Validator

Validate cron expressions and preview upcoming run times.

Converters

Binary Converter

Convert text to binary, hex, and decimal bytes.

Find tools by task

Start with the kind of work you are doing, then jump into the utilities that usually belong together.

Format and validate

Clean up JSON, SQL, HTML, XML, YAML, JavaScript, and regex patterns before sharing or debugging.

JSON Formatter HTML Validator CSS Validator YAML Validator CSV Validator

Convert developer data

Move between JSON, YAML, CSV, XML, Markdown, HTML, binary bytes, colors, cURL commands, and code snippets.

JSON to YAML HTML to Markdown JSON to CSV CSV to JSON Binary Converter

Encode and decode

Decode tokens, Base64 strings, URL parameters, HTML entities, and query strings.

JWT Decoder Base64 Encoder/Decoder URL Encoder/Decoder Query String Parser

Generate test values

Create passwords, UUIDs, JWTs, bcrypt hashes, QR codes, mock JSON, cron expressions, and tracking URLs.

Password Generator UUID Generator JSON Generator QR Code Generator Bcrypt Generator

Debug requests and logs

Inspect timestamps, cron schedules, user agents, URLs, cURL commands, minified scripts, and text differences while tracking bugs.

Timestamp Converter Cron Validator HTTP Status Codes Text Diff Checker

Developer Utilities by Task

Web Developer Utilities groups common workflows into focused pages, so each tool matches a clear task: formatting, converting, validating, encoding, decoding, generating, and debugging.

Popular Online Tools

Start with the high-intent utilities people search for most often, then move through related tools with the internal links on each page.

JSON to TypeScript JSON to YAML cURL to Code SQL Formatter Markdown to HTML JSON Formatter Text Diff Checker Regex Tester String Case Converter HTML/XML Formatter JWT Decoder Base64 Encoder/Decoder