Postman to Swagger Convert a Postman collection to an OpenAPI 3.0 spec. Online API Tester Send GET/POST/PUT/PATCH/DELETE requests to any API from your browser. Plunger: desktop API tester Unclog your API. A tiny, open source Windows app: make the request, see the JSON. Reaches localhost, no CORS limits. JWT Decoder Decode and inspect a JSON Web Token. JWT Generator Create and sign a JWT with HS256, HS384, or HS512. JSON Formatter & Validator Format, validate, and minify JSON with precise error locations. Regex Tester Test a regular expression with live match highlighting and capture groups. Base64 & URL Encoder / Decoder Encode or decode Base64 and URL-encoded strings, with full Unicode support. Confluence to Markdown Convert a Confluence HTML export into clean Markdown. Clean Concatenated SQL Turn a string-concatenated SQL statement into a clean, executable query. URL Parser & Explainer Break a URL down into color-coded parts, each explained in plain English. YAML Formatter & YAML/JSON Converter Validate, pretty-print YAML, and convert between YAML and JSON. Cron Expression Parser & Explainer Explain any cron expression in plain English and see its next 5 run times. UUID Generator & Inspector Generate UUID v4/v7 in bulk, or inspect a UUID's version, variant, and embedded timestamp. Unix Timestamp Converter Convert Unix epoch to ISO 8601 and human-readable dates, and back, with a live clock. Hash Generator (MD5, SHA-1, SHA-256, SHA-512) Compute MD5 and SHA family hashes of any text, live as you type. JSON Diff / Compare Compare two JSON documents and see exactly what was added, removed, or changed. cURL to Code Converter Turn a curl command into JavaScript, Python, PHP, or Go request code. HTTP Status Code Reference Searchable reference of every HTTP status code, what it means, and when to use it. Color Converter (HEX, RGB, HSL) Convert colors between HEX, RGB, and HSL, with instant tints and shades. Markdown to HTML Live Preview Write or paste Markdown and see it rendered live, with sanitized HTML output. Mock JSON Data Generator Define a schema and generate realistic fake test data: names, emails, UUIDs, and more.