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Developer

Developer utilities for JSON, URLs, Base64, and payload debugging.

Debug routine web data formats in a focused workspace that does not require pasting payloads into a remote API.

Common developer tasks you can finish instantly

•Format, validate, minify, and sort JSON.
•Encode or decode URLs and query strings.
•Encode text to Base64 or decode Base64 payloads.

When to use each tool

Inspecting raw API responses

When an endpoint returns a minified JSON block and you need to quickly format it with indentation to read the structure.

Debugging query parameters

When a URL contains complex encoded characters (%20, %3D) and you need to see the exact values being passed to the server.

Preparing payload data

When you need to encode local strings into Base64 to safely embed them in headers or configurations.

Tools in this collection

26 developer tools ready to use

Browse all tools

Regex TesterREGEX

Test and debug regular expressions with real-time highlighting

UUID GeneratorUUID v4

Generate bulk v4 UUIDs locally with custom formatting

Markdown to HTML.MD → .HTML

Convert Markdown text to HTML with real-time preview

HTML Formatter.HTML

Format, indent, and beautify HTML code locally

XML Formatter.XML

Format, indent, and beautify XML data locally

SVG Optimizer.SVG

Clean up and format SVG code to reduce size and improve readability

Favicon Generator.ICO / .PNG

Generate favicon packages (ICO and PNGs) from any image

URL Encoder/DecoderURL

Encode and decode URLs for safe transmission and storage

Base64 Encoder/DecoderBASE64

Encode and decode data using Base64 encoding

JSON Formatter & Validator.JSON

Format, minify, validate, and optionally sort JSON keys locally

QR Code GeneratorPNG / SVG

Generate QR codes for URLs, text, and data locally

Markdown Table Generator.MD

Build and edit markdown tables visually with alignment controls and live preview

Markdown Pro Studio.MD → .HTML

Professional-grade Markdown editor with real-time preview, Mermaid diagrams, KaTeX math, and smart tools.

SQL Formatter.SQL

Format and beautify SQL queries locally for readability

Cron Expression GeneratorCRON

Visually generate and explain cron schedule expressions

JSON to TypeScript.JSON → .TS

Convert JSON payloads into TypeScript interfaces instantly

YAML to JSON Converter.YAML → .JSON

Convert YAML configuration to JSON format locally

CSS Formatter & Minifier.CSS

Format, beautify, and minify CSS code locally

Chmod CalculatorCHMOD

Calculate Linux chmod permissions visually

Parse URLs and decode query string parameters

UTM Link BuilderUTM

Build Google Analytics tracking URLs easily

Meta Tags GeneratorHTML / OG

Generate standard and Open Graph HTML meta tags for SEO

Image Color Picker.JPG .PNG

Extract HEX/RGB colors from images using an eyedropper

XML to JSON Converter.XML → .JSON

Convert XML data to JSON format locally

Aspect Ratio Calculator16:9 / 4:3

Calculate aspect ratios and missing image dimensions

Number Base ConverterHEX / BIN / DEC

Convert numbers between binary, octal, decimal, and hex

Pro Tip: Combine tools for a faster workflow

You can chain these tools together to handle complex tasks. For example:Add JPG receipts → Convert to PDF → Merge with a cover letter PDF → Download one final file.

Frequently Asked Questions

Is it safe to paste real API data?

Yes. Our developer tools like the JSON Formatter and Base64 Encoder process your strings locally. The payloads never leave your browser.

Will the JSON Formatter fix invalid JSON?

It includes a validator that will pinpoint exactly where the syntax error is (like a missing comma or quote) so you can fix it.

Related tool collections

DocumentsMerge PDFs, convert images, and prepare simple document files in your browser.TextClean up, summarize, and transform text without sending drafts to a remote service.ConvertersConvert units, timestamps, and color formats with clear inputs and instant output.SecurityGenerate passwords and inspect tokens locally when sensitive values should stay private.