Developer Test Data Tools — UUID, JSON & SQL
Developer generators: UUID bulk, dummy JSON, SQL INSERT seeds, custom schema mock CSV/JSON/XML export free.
UUID, JSON, CSV, XML, SQL, JWT, formatters, converters, encoders, and Base64 utilities for development workflows. This category includes 20 free online tools on Random Data Hub, including UUID / ID Generator, Mock Data Generator, JSON Generator, SQL Dummy Data Generator, JWT Generator, Base64 Encode / Decode, and more. Each generator produces fictional data for QA, staging environments, and UI prototypes—never for fraud, spam, or impersonation. Select a tool below to generate sample output, read step-by-step instructions, and review frequently asked questions about safe test-data practices.
Generate UUID v4, NanoID, or ULID identifiers in bulk.
Open toolMock & random data generator—SQL, sample rows, 1,000 export.
Open toolJSON random data—create dummy JSON user arrays for APIs.
Open toolDummy MySQL/Postgres data—INSERT scripts & database test seeds.
Open toolSample JWT-shaped tokens for auth UI demos only.
Open toolEncode or decode text in the browser—no upload.
Open toolFree online fake mac address generator for test data.
Open toolIPv4 and IPv6 test addresses.
Open toolFormat SQL queries with clearer keywords and indentation.
Open toolBuild cURL commands from method, URL, headers, and body.
Open toolPercent-encode text for safe use in URLs and query strings.
Open toolEscape HTML entities for safe display in pages.
Open toolDecode JWT header and payload without verifying signatures.
Open toolPretty-print HTML markup with clearer nesting.
Open toolFormat CSS rules with consistent braces and spacing.
Open toolFormat JavaScript for readability in reviews and docs.
Open toolTest regular expressions against sample text in-browser.
Open toolGenerate an XML sitemap snippet from a list of URLs.
Open toolGenerate title, description, and robots meta tags for SEO.
Open toolGenerate basic JSON-LD schema markup for web pages.
Open tool