Discover our latest additions. Fresh tools added regularly to help you work smarter.
Generate PGP public and private key pairs for email encryption and code signing. Supports ECC (Curve25519) and RSA up to 4096-bit. Entirely browser-side — keys never leave your device.
Generate Ed25519 and RSA 4096-bit SSH key pairs entirely in your browser. Keys are never sent to any server — 100% client-side using the Web Crypto API.
Compare two API response payloads and highlight added, removed, and changed fields. Paste any two JSON responses to get an instant field-level diff with color-coded changes and a summary count.
Generate common HTTP request headers for authentication, content-type, caching, and security. Toggle each category, configure values, and copy the output as raw key-value pairs, JSON, fetch(), cURL, or axios.
Document a REST endpoint quickly by entering the URL, method, headers, and sample request/response. Generates formatted Markdown documentation and an example cURL command instantly.
Calculate offset, limit, cursor, and page-based pagination parameters for API responses. Generates Link headers and standard response headers instantly.
Convert Postman Collection v2.1 JSON to OpenAPI 3.0 specification format. Upload or paste your collection, and get a downloadable openapi.yaml or openapi.json with mapped paths, parameters, request bodies, and example responses.
Format and validate GraphQL query variables JSON for use in queries and API clients. Paste your variables JSON alongside a GraphQL query to instantly format the JSON, validate that each variable matches its declared type, catch missing required variables, and highlight undeclared extras.
Generate structured, realistic mock data for API endpoint testing. Define fields with names and types — UUID, name, email, integer, enum, date, and more — set how many rows you need, and export as a JSON array, NDJSON, or CSV. All generation runs entirely in your browser with no data sent to any server.
Generate JSON Web Keys (JWK) for RS256, ES256, HS256 and other JWT signing algorithms. Produces public/private key pairs and ready-to-use JWKS endpoint JSON for RSA, ECDSA, and HMAC algorithms. All keys are generated locally in your browser using the Web Crypto API — nothing is sent to any server.
Parse and visualize X-RateLimit headers from raw HTTP API responses. Paste response headers to instantly see your quota state — limit, remaining, used, and reset time — displayed as color-coded progress meters. Supports GitHub, OpenAI, Twitter/X, Shopify, and IETF standard rate limit headers.
Decode HTTP status codes and OAuth 2.0 error strings with plain-English descriptions, common causes, and actionable fix suggestions. Covers every HTTP 1xx–5xx status code and all standard OAuth 2.0 error responses. Results appear instantly as you type.