Generate test data objects from a schema defining field names and types. Everything runs locally in your browser — nothing is uploaded.
Generate Apache Avro schemas from a JSON field definition. Configure namespace, record name, and field types — outputs valid Avro schema JSON.
Generate a JSON Schema (draft-07) from sample JSON data. Auto-detect types, required fields, and nested structures.
Generate realistic mock JSON data from a schema description. Ideal for rapid API prototyping and frontend development without a backend.
Generate JSON-LD BreadcrumbList structured data from a list of page names and URLs. Add breadcrumb schema to your website for better SEO.
Generate JSON-LD structured data markup for Article, Product, FAQ, LocalBusiness, Recipe, and Event schema types.
Test Data Generator lets you generate test data objects from a schema defining field names and types. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Generate test data objects from a schema defining field names and types. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Direct text entry, file upload, or URL-based input — depending on the tool. Paste or type your content directly into the provided editor area.
Yes. After the initial page load, Test Data Generator runs entirely on your device with no internet connection needed. All processing is done locally.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check individual tool descriptions for specifics.
No. All code processing — formatting, minification, conversion, hashing — runs locally in your browser.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. SQL uses sql-formatter, JSON uses native JSON.parse, and other formatters follow widely adopted formatting rules.
Yes. All developer tools work fully offline after the initial page load.
Time Converter
Convert between time units including seconds, minutes, hours, days, weeks, months, and years with precise decimal results.
Random Port Generator
Generate random TCP/UDP port numbers from well-known, registered, or dynamic ranges. Useful for network testing, Docker port mapping, and firewall configuration.
Chmod Calculator
Convert between numeric (755) and symbolic (u=rwx,g=rx,o=rx) chmod permission formats. See detailed breakdown for owner, group, and others.
Docker Run to Compose Converter
Convert docker run commands to docker-compose.yml format. Supports ports, volumes, environment variables, networks, restart policies, and container names.
Email Normalizer
Normalize email addresses by removing dots (Gmail), stripping +tags, and lowercasing. Process multiple emails at once for deduplication and cleaning.
Diff Checker
Compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors.