Practical utilities for developers

Paste the code. Find the problem.

Format JSON, clean HTML, inspect APIs, encode URLs, validate data and handle common development tasks without opening a large IDE or searching across multiple websites.

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Tools marked Available can be used now. More developer tools will be added as their pages and browser extensions are completed.

JSON HTML & CSS JavaScript APIs Encoding

JSON Formatter
                      Format, validate and inspect data
                    
                    Valid

JSON

Tree View

Errors

1 { 2 "project": "Turnkey Tools", 3 "status": "active", 4 "tools": [ 5 "JSON Formatter", 6 "API Tester", 7 "HTML Cleaner" 8 ], 9 "public": true 10 }

✓

Valid JSON 10 lines · 149 characters

READY

Format Clean and organize code

Validate Find syntax and data errors

Convert Move between formats

Test Inspect APIs and web data

Developer toolbox

Find the right tool for the next coding task.

Search the collection or filter tools by data, code, web, encoding, APIs and testing.

{ }

Available

JSON Formatter

Format, validate, minify and sort JSON data directly in the browser.

JSON Formatting Validation

Open JSON Formatter →

JSON

Coming Soon

JSON Toolbox

Use formatting, validation, tree views, escaping, sorting and comparison tools from one browser extension.

JSON Browser extension Developer utility

View JSON Toolbox →

VALID

Planned

JSON Validator

Check JSON syntax and display readable error locations and messages.

Syntax Errors JSON

Planned for Developer Tools

J→C

Planned

JSON to CSV Converter

Convert compatible JSON arrays into downloadable CSV tables.

JSON CSV Conversion

Planned for Developer Tools

C→J

Planned

CSV to JSON Converter

Convert CSV rows and column headers into structured JSON data.

CSV JSON Data

Planned for Developer Tools

DIFF

Planned

JSON Compare Tool

Compare two JSON values and highlight additions, removals and changed properties.

Compare Diff JSON

Planned for Developer Tools

HTML

Planned

HTML Formatter

Format, clean, indent and minify HTML code with configurable spacing.

HTML Beautify Minify

Planned for Developer Tools

CSS

Planned

CSS Formatter

Beautify or minify CSS and organize selectors, properties and declarations.

CSS Formatting Minification

Planned for Developer Tools

Planned

JavaScript Formatter

Format and minify JavaScript for easier reading, debugging and deployment.

JavaScript Beautify Minify

Planned for Developer Tools

SQL

Planned

SQL Formatter

Format SQL queries with readable indentation, clauses and capitalization.

SQL Queries Databases

Planned for Developer Tools

XML

Planned

XML Formatter

Format, validate and minify XML documents and configuration data.

XML Validation Formatting

Planned for Developer Tools

A↔B

Planned

Code Difference Checker

Compare two code blocks and highlight changed, added and removed lines.

Code diff Compare Source code

Planned for Developer Tools

URL

Planned

URL Encoder & Decoder

Encode special URL characters or decode percent-encoded text into readable values.

URLs Encoding Decoding

Planned for Developer Tools

B64

Planned

Base64 Encoder & Decoder

Convert text or supported file data to Base64 and decode Base64 values.

Base64 Encoding Data

Planned for Developer Tools

&#;

Planned

HTML Entity Converter

Encode reserved HTML characters or decode HTML entities back into readable text.

HTML entities Characters Encoding

Planned for Developer Tools

JWT

Planned

JWT Decoder

Decode JWT headers and payloads locally for inspection and debugging.

JWT Tokens Authentication

Planned for Developer Tools

TIME

Planned

Unix Timestamp Converter

Convert Unix timestamps into readable dates or turn dates into epoch time.

Unix time Dates Epoch

Planned for Developer Tools

UUID

Planned

UUID Generator

Generate one or multiple unique identifiers for development and test data.

UUID Identifiers Test data

Planned for Developer Tools

API

Planned

API Request Tester

Send GET, POST, PUT, PATCH and DELETE requests with headers and request bodies.

REST API HTTP Requests

Planned for Developer Tools

HDR

Planned

HTTP Header Inspector

Inspect response headers, content types, caching rules and server details for a URL.

Headers HTTP Responses

Planned for Developer Tools

CURL

Planned

cURL Command Builder

Create cURL commands with request methods, headers, authentication and body data.

cURL API Terminal

Planned for Developer Tools

HOOK

Planned

Webhook Payload Viewer

Format and inspect sample webhook payloads, headers and event structures.

Webhooks Payloads Events

Planned for Developer Tools

Planned

Regular Expression Tester

Test regex patterns against sample text and highlight matching values.

Regex Patterns Matching

Planned for Developer Tools

CRON

Planned

Cron Expression Builder

Build cron schedules and preview when a recurring task will run.

Cron Scheduling Jobs

Planned for Developer Tools

HASH

Planned

Hash Generator

Generate common cryptographic hashes and checksums from text or supported files.

SHA Checksums Hashes

Planned for Developer Tools

200

Planned

HTTP Status Code Lookup

Look up the meaning and common use of HTTP response codes.

Status codes HTTP Reference

Planned for Developer Tools

MIME

Planned

MIME Type Lookup

Find common MIME types using a file extension or content type.

MIME Files Content types

Planned for Developer Tools

GRAD

Planned

CSS Gradient Generator

Build linear and radial gradients visually and copy the finished CSS.

CSS Gradients Design

Planned for Developer Tools

SHDW

Planned

CSS Box Shadow Generator

Adjust shadow position, blur, spread, opacity and color while previewing the result.

CSS Box shadow Preview

Planned for Developer Tools

RWD

Planned

Responsive Breakpoint Tester

Preview page layouts at common mobile, tablet and desktop viewport widths.

Responsive Viewport Testing

Planned for Developer Tools

HEX

Coming Soon

Page Color Picker

Capture webpage colors and copy HEX, RGB, HSL and CSS-ready values.

Colors CSS Browser extension

View Page Color Picker →

PNG

Coming Soon

Full Page Capture

Capture an entire scrolling webpage as a single image for testing and documentation.

Screenshot Webpage Browser extension

View Full Page Capture →

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Browse by development task

Developer utilities organized around the work being done.

Move from formatting code and converting data to testing APIs, debugging requests and building web interfaces.

Data & JSON Tools

Format, validate, compare and convert JSON, CSV and structured data.

Browse data tools → Code Formatters

Clean and organize HTML, CSS, JavaScript, XML, SQL and other code.

Browse code tools → API Tools

Test requests, inspect headers, build cURL commands and review payloads.

Browse API tools → Testing & Debugging

Test regular expressions, breakpoints, schedules, hashes and page output.

Browse testing tools →

Built for everyday debugging

Move from broken input to usable output.

The developer collection is designed to handle small, repetitive tasks quickly without interrupting the main coding workflow.

Step 01

Paste the input

Add code, data, a URL, an API request or the value that needs inspection.

Step 02

Run the developer tool

Format, validate, convert, decode, compare or test the input.

Step 03

Review the output

Inspect errors, changed values, request responses or generated code.

Step 04

Copy the result

Return the cleaned or corrected result to the project.

Keep the small developer utilities within reach.

Format code, inspect data, test APIs and solve common development problems from one practical toolbox.

Browse Developer Tools

Common questions

Everything you should know.

Find answers about available tools, browser processing, API testing, saved data and future developer features.

They are practical utilities for formatting code, validating structured data, encoding values, inspecting APIs and testing common web-development details.

Tools marked Available can be used now. Coming Soon and Planned tools will become active as their individual pages and extensions are completed.

Many formatting, conversion and validation tools can process data directly in the browser. Tools requiring remote API requests should clearly explain what information leaves the device.

No. Avoid entering production API keys, passwords, private tokens or confidential credentials into online tools.

Basic developer utilities can remain free. Saved workspaces, larger API limits, team features and advanced testing may eventually become paid upgrades.