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Developer

Online developer tools: JSON Formatter, YAML converter, Regex Tester, SQL Formatter, JWT Decoder and 30+ more. Free, fast, no signup.

41 tools

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JSON Formatter

Format, beautify and validate your JSON. Supports minify and prettify.

#json#format#beautify

✅

JSON Validator

Validate JSON and display detailed error messages with line numbers.

#json#validate#lint

⏰

Cron Expression Explainer

Explain cron expressions in plain language. E.g. "0 9 * * 1-5" → "At 9:00 AM, Monday through Friday".

#cron#schedule#crontab

📄

YAML to JSON

Convert YAML to JSON and JSON to YAML quickly and accurately.

#yaml#json#converter

🔍

Regex Tester

Test regular expressions against text and see matches highlighted in real time.

#regex#regexp#pattern

🎨

HTML Beautifier

Format and beautify HTML code with proper indentation.

#html#beautify#format

⏱️

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds.

#unix#timestamp#epoch

🗄️

SQL Formatter

Format and beautify SQL queries. Supports MySQL, PostgreSQL, SQLite, T-SQL.

#sql#format#beautify

🔀

JSON Diff

Compare two JSON objects and highlight differences. Paste two JSONs separated by a --- line.

#json#diff#compare

📐

PX / REM / EM Converter

Convert between CSS px, rem and em units. Supports converting multiple values at once.

#css#px#rem

🔤

String Escape / Unescape

Escape or unescape JavaScript strings and HTML entities. Supports \n, \t, \"...

#escape#unescape#string

📝

Markdown Preview

Real-time split-pane Markdown editor with live HTML preview. Supports GFM.

#markdown#preview#md

🔄

JSON to YAML Converter

Convert JSON to human-readable YAML format instantly in your browser.

#json#yaml#converter

🎨

CSS Formatter & Minifier

Format messy CSS into clean readable code, and minify it to reduce file size — all in one tool.

#css#formatter#beautifier

📅

Timestamp to Date

Convert Unix timestamp to human-readable date.

#timestamp#date#converter

🕐

Date to Timestamp

Convert date string to Unix timestamp.

#date#timestamp#converter

🔒

SSL Checker

Check website SSL/TLS certificate: expiry date, issuer, trust level and security grade.

#ssl#https#certificate

🔡

HTML Entity Encoder / Decoder

Automatically encode special characters to HTML entities or decode HTML entities back to text.

#html#entity#encode

🔷

JSON to TypeScript Types

Automatically generate TypeScript interfaces and types from JSON. Supports nested objects and arrays.

#json#typescript#types

📧

Email Validator

Validate email addresses in bulk against RFC 5322 rules. Shows detailed reason for each invalid email.

#email#validate#verify

💳

Credit Card Validator (Luhn)

Validate credit card numbers using the Luhn algorithm. Detects card network: Visa, Mastercard, Amex, JCB...

#credit card#luhn#visa

📋

Markdown Table Generator

Convert pipe, CSV, or tab-separated data into a properly formatted GitHub Flavored Markdown table.

#markdown#table#gfm

⏰

Cron Expression Explainer

Parse each cron field and explain it in plain English. Recognizes common presets and shows field reference.

#cron#expression#schedule

🗜️

Code Minifier

Auto-detects JS, CSS, or HTML and minifies by removing comments and unnecessary whitespace.

#minify#minifier#compress

🏷️

Meta Tag Generator

Generate complete SEO meta tags, Open Graph, and Twitter Card tags from your page information.

#meta#seo#open-graph

🌑

CSS Box Shadow Generator

Generate CSS box-shadow with multiple layers and built-in presets (soft, elevated, neumorphism). Exports CSS, Tailwind, and React inline style.

#css#box-shadow#shadow

🌐

HTTP Status Code Reference

Look up the meaning of any HTTP status code (1xx–5xx). Supports group lookups like "4xx".

#http#status#code

🔍

JSONPath Tester

Test and debug JSONPath expressions against real JSON data. Supports paths, wildcards, and recursive descent.

#jsonpath#json#query

📋

JSON Schema Generator

Auto-generate JSON Schema (Draft 2020-12) from sample JSON. Detects email, URI, date, UUID formats.

#json schema#draft-2020#generator

🌐

IP Subnet Calculator

Calculate subnet info from IP and CIDR. Network IP, broadcast, host range, binary, subnet splitting.

#ip#subnet#cidr

🎨

SVG Optimizer

Strip metadata, comments, and redundant attributes from Figma/Illustrator SVGs. Significantly reduces file size.

#svg#optimizer#minify

🐳

Docker Compose Generator

Generate docker-compose.yml with 10+ service templates: Postgres, Redis, Nginx, MongoDB, RabbitMQ, MinIO...

#docker#compose#container

🖼️

Open Graph Image Generator

Design OG images as HTML 1200×630 with 4 themes. Export complete meta tags for Twitter & Facebook.

#og#open graph#meta

🗄️

JSON to SQL

Convert JSON array to SQL INSERT statements. Supports MySQL, PostgreSQL and SQLite. Auto-generates CREATE TABLE.

#json#sql#insert

📐

JSON Flattener

Flatten nested JSON into dot-notation keys or unflatten back. E.g. {"a":{"b":1}} → {"a.b":1}.

#json#flatten#unflatten

🔤

JSON Key Sorter

Sort all keys in JSON alphabetically (recursive, deep). Normalizes JSON configs and makes diffs easier to read.

#json#sort#keys

🐹

JSON to Go Struct

Auto-generate Go struct definitions from JSON. Supports nested objects, arrays, json tags, and proper PascalCase naming.

#json#go#golang

🔧

JSON Repair

Automatically fix broken JSON: trailing commas, single quotes, unquoted keys, JS comments, undefined/NaN, and unclosed brackets.

#json#repair#fix

🛡️

JSON to Zod Schema

Auto-generate Zod schemas from JSON. Supports nested objects, arrays and auto-exports TypeScript types via z.infer.

#json#zod#schema

#️⃣

JSON to C# Class

Auto-generate C# class definitions from JSON. Supports nullable types, JsonPropertyName attributes, nested classes and namespaces.

#json#csharp#c#

📈NEW

Trend Hunter — Google Trends Keyword Explorer

Enter any keyword to see its 12-month Google Trends interest chart, discover breakout queries with explosive growth, and explore top related search terms. Free and instant — no signup needed.

#google trends#keyword research#trending keywords

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