Developer Tools

JSON Formatter

Validate, format, and minify JSON data.

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JSON Editor

Edit and explore JSON with a live split-panel code and tree view editor.

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HTML Formatter

Beautify and format HTML code with proper indentation.

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CSS Formatter

Beautify and format CSS code with proper indentation.

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JavaScript Formatter

Beautify and format JavaScript code with proper indentation.

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CSS Minifier

Minify CSS code to reduce file size.

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HTML Minifier

Minify HTML code to reduce page size.

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JavaScript Minifier

Minify JavaScript code to reduce file size.

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HTML Encoder / Decoder

Encode or decode HTML entities in any text.

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JWT Encoder / Decoder

Encode and decode JSON Web Tokens (JWT) in your browser.

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Code to Image Converter

Convert code snippets into beautiful shareable images.

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Fake Name Generator

Generate realistic fake person data for testing.

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Credit Card Validator

Validate credit card numbers using the Luhn algorithm.

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Regex Tester

Test JavaScript regular expressions in real time with match highlighting and capture groups.

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Markdown Editor

Write Markdown with live HTML preview, copy or download the rendered output.

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Text Diff Checker

Compare two pieces of text and visualise added, removed and changed lines side-by-side.

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Cron Expression Builder

Build and parse cron expressions with plain-English explanations and next run previews.

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SQL Formatter

Format and beautify SQL queries with proper indentation across MySQL, PostgreSQL and other dialects.

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HTML Parser

Paste HTML and explore the DOM tree, test CSS selectors, and see matched elements highlighted live.

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HTML Validator

Validate HTML markup - find unclosed tags, missing alt text, heading hierarchy and accessibility issues.

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HTML to JSON Converter

Convert any HTML markup into a clean JSON tree structure with tag, attributes and children.

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Subnet / CIDR Calculator

Calculate network address, broadcast, usable hosts, subnet mask and binary representation for any IPv4 CIDR block.

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Mailto Link Generator

Build mailto: links with multiple recipients, CC, BCC, subject and pre-filled body.

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Markdown Table Generator

Build Markdown tables visually or paste CSV/TSV - with column alignment and live preview.

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HTML to JSX Converter

Convert raw HTML to React JSX: rewrites class to className, camelCases attributes and self-closes void elements.

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YAML / TOML Converter

Round-trip between YAML, JSON and TOML. Paste any format, convert to either of the others instantly.

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Mock JSON Data Generator

Generate realistic fake JSON data - names, emails, phones, addresses, dates and more - by the hundreds.

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HTTP Status Code Reference

Searchable reference of every HTTP status code (1xx-5xx) with descriptions and when to use each.

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Carbon Footprint Checker

We fetch the page once with a real browser User-Agent, follow redirects, and measure how many bytes the server actually returns. Then we app...

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Title Tag Ctr Predictor

It applies a rule-based scoring model with eight signals that each map to a delta against a baseline of 50. Length (50-60 chars = +20, 40-50...

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HTML Input Generator

You can generate every standard HTML5 input type including text, email, password, number, tel, url, search, date, time, datetime-local, mont...

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HTML Text Tag Generator

Strong and em carry semantic weight - strong means the content is important and em means stressed emphasis, both of which screen readers con...

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HTML Media Embed Generator

Wrap the video or iframe in a container with an aspect-ratio rule, or use the native CSS aspect-ratio property like aspect-ratio: 16 / 9 on...

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HTML Element Generator

Details creates a native disclosure widget - a collapsible section that toggles open and closed without any JavaScript. Summary is the alway...

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Email Validator

The validator runs two layers of checks. First, it confirms the address follows RFC 5322 syntax rules covering the local part, the @ symbol...

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Email Header Analyzer

Headers contain the full delivery story of a message. You can see every server hop in the Received chain, the originating IP, timestamps for...

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Email Subject Tester

The tester scores three main factors. Length should fall between 30 and 50 characters so it does not get truncated on mobile. Spam-trigger w...

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Disposable Email Detector

A disposable or throwaway email address is created by a free service such as Mailinator, Guerrilla Mail, 10MinuteMail or Temp-Mail. Users si...

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Email Signature Generator

A strong signature has your full name, job title, company name, a primary contact method such as a direct phone number, and a clickable link...

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JSON To YAML

JSON uses braces and brackets to mark objects and arrays, with strict comma separators and double-quoted keys. YAML relies on indentation an...

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YAML To JSON

YAML uses indentation to express nesting, so a misaligned space changes structure rather than just appearance. Tabs are forbidden because th...

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JSON To CSV

The input must be an array of objects where each object represents one row. The keys of the first object become the CSV header, and subseque...

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CSV To JSON

By default the first row of the CSV is treated as the header, and each subsequent row becomes a JSON object whose keys are those header name...

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JSON To XML

Each key becomes the name of an XML element, and its value becomes the element content. Object values produce nested elements, primitive val...

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XML To JSON

Each element name becomes a JSON key, and its content becomes the value. Elements with only text become string values, elements with childre...

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JSON Diff

A text diff compares character by character and reports formatting changes like reordered keys or whitespace as differences, even when the d...

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JSON Schema Validator

JSON Schema is a vocabulary for describing the shape of JSON data - required keys, allowed types, value ranges, string patterns, and enums....

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JSON To Typescript

The generator walks the JSON, picks the narrowest matching TypeScript type for each value, and bubbles up object types with named interfaces...

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Jsonpath Evaluator

JSONPath is a query language for selecting nodes inside a JSON document, designed to feel like XPath but adapted for JSON. The dollar sign r...

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Cron to English

Translate any cron expression to plain English and preview the next 10 run times in your local timezone.

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curl ↔ fetch ↔ axios Converter

Convert any cURL command to JavaScript fetch or axios - and back, with auto-detection.

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JSON Schema Diff

Compare two JSON Schemas side-by-side. Shows added, removed and changed fields with semantic meaning.

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Regex from Examples

Paste lines that should match and lines that should not - get a regex that satisfies both.

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CSP Generator from URL

Crawl a URL to discover all script/style/image/font origins, then generate a Content-Security-Policy header that won't break the site.

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