45 focused utilities

Code & Data Tools

Format, validate, convert and inspect JSON, SQL, XML, YAML, APIs and application data directly in your browser.

JSON Formatter

Format and validate JSON instantly.

JSON Minifier

Compress JSON without changing data.

JSON Diff

Compare two JSON documents line by line.

JSON to CSV

Convert an array of objects to CSV.

CSV to JSON

Turn CSV rows into structured JSON.

YAML to JSON

Convert simple YAML documents to JSON.

XML Formatter

Indent compact XML for easier reading.

SQL Formatter

Make SQL queries readable.

SQL Minifier

Collapse SQL to a single compact line.

RegEx Tester

Test JavaScript regular expressions with highlights.

Base64 Encoder

Encode UTF-8 text as Base64.

Base64 Decoder

Decode Base64 back to UTF-8.

JWT Decoder

Inspect JWT content without verifying its signature.

URL Encoder

Percent-encode text for URLs.

URL Decoder

Decode percent-encoded URL text.

HTML Entity Encoder

Escape HTML-sensitive characters.

HTML Entity Decoder

Decode HTML entities back to text.

SHA-256 Hash

Create a SHA-256 digest locally.

HMAC-SHA256

Sign text with an HMAC-SHA256 key.

UUID Generator

Generate random RFC 4122 UUIDs.

Unix Timestamp Converter

Convert Unix time to ISO dates.

Smart Input Detection

Paste unknown data and get likely formats plus the best matching tools.

JSON Schema Validator

Validate JSON against a practical JSON Schema subset.

JSONPath Tester

Query JSON with common JSONPath expressions.

XPath Tester

Evaluate XPath expressions against XML or HTML.

cURL ↔ Fetch / Axios

Convert cURL commands to browser Fetch or Axios snippets.

API Request Tester

Send HTTP requests and inspect status, headers and response body.

Cron Expression Parser

Explain a five-field cron expression and calculate upcoming runs.

Semantic Version Calculator

Compare versions and test common semantic-version ranges.

Number Base Converter

Convert integers between binary, octal, decimal and hexadecimal.

chmod Calculator

Translate Unix permission modes between symbolic and octal forms.

MIME Type Lookup

Look up common MIME types from an extension or filename.

.env Parser / Validator / Diff

Parse, validate and optionally compare environment files.

Mock Data Generator

Generate realistic local test records from a compact template.

JSON → Typed Models

Generate TypeScript, Go, Java or C# models from JSON.

TypeScript Interface → JSON

Create representative JSON from a TypeScript interface.

SQL DDL → TypeScript

Turn CREATE TABLE columns into TypeScript interfaces.

OpenAPI / Swagger Validator

Check the essential structure and references of an API document.

GraphQL Formatter / Builder

Format GraphQL documents and build a query from field paths.

Protocol Buffers Viewer

Inspect .proto messages, enums, services and fields.

jq Playground

Run common jq-style selectors, projections and array iteration locally.

TOML ↔ JSON

Convert common TOML documents to JSON or JSON to TOML.

INI ↔ JSON

Convert INI configuration files to JSON and back.

Properties Converter

Convert Java .properties files to JSON and back.

Floating Point Inspector

Inspect IEEE-754 binary64 sign, exponent and fraction bits.