Free Public REST APIs

Returns general service status, available endpoint routes, API version, and uptime metadata.

Accepts raw JSON or a JSON string and returns cleanly formatted JSON with configurable indent spaces or tab formatting.

Minifies JSON payloads, returning compressed string and calculated byte savings percentage.

Parses provided JSON and returns validation status. If invalid, provides error message, line number, and character position.

Infers type definitions and generates TypeScript `interface` or `type` code blocks from JSON objects.

Parses input JSON and renders standard YAML with customizable indent level.

Parses standard YAML string and returns structured JSON with customizable indentation.

Generates one or multiple cryptographically secure RFC-4122 compliant UUIDs with options for uppercase and hyphens.

Normalizes Unicode text, removes diacritics/accents and special symbols, and joins words using a custom separator.

Converts input text into camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Sentence case, and Title Case simultaneously.

Generates secure hexadecimal message digests from input text with optional salt.

Accepts a timestamp in seconds, milliseconds, or ISO date string and returns standard formatted date representations in UTC and common formats.

Renders QR code from input text or URL, with configurable error correction level, color, margin, and output format (SVG or data URL PNG).

Computes color harmonies (complementary, analogous, triadic, monochromatic) for a base hex code, with WCAG 2.1 contrast ratios against black and white.

Tests a pattern and optional flags against a test string, returning matched positions, count, and capture groups.

Safely fetches an external webpage (with strict SSRF protection, private IP blocking, and timeout handling) to parse Open Graph, Twitter cards, title, description, and canonical URL.

Performs schema and semantic checks against Fabric Minecraft mod metadata definitions (`fabric.mod.json`), validating mod ID format, semver version, entrypoints, and licenses.

Validates `pack.mcmeta` for datapacks and resource packs, checking pack_format against known Minecraft releases.

Generate CSS gradient rules, Tailwind inline utility classes, and preset gradients for linear, radial, and conic types with custom color stops.

Generate customized placeholder text for design mockups, wireframes, and API test payloads with optional HTML paragraph tag wrapping.