Step-by-step guides, REST API tutorials, developer docs, and technical references to help you build, test, and optimize web applications.
Learn how to test APIs online with GET, POST, PUT, PATCH and DELETE requests. Send headers and JSON payloads, inspect status codes and responses, and test REST APIs directly in your browser with ToolJi.
Learn how to test APIs online with GET, POST, PUT, PATCH and DELETE requests. Send headers and JSON payloads, inspect status codes and responses, and test REST APIs directly in your browser with ToolJi.
Learn how to take full page website screenshots online. Capture high-res desktop & mobile webpage screenshots, export PNG, WEBP, or PDF, and convert HTML files with ToolJi.
Explore ToolJi's browser-based API testing workspace. Learn how to configure query parameters, authorization bearer tokens, JSON request bodies, cURL commands, and code generators.
Master JSON syntax validation, detect missing quotes or trailing commas, beautify compact API response payloads, and inspect nested tree objects with ToolJi's JSON Formatter.
Learn how to compare two JSON API responses side-by-side to highlight added keys, deleted fields, and value mutations during API regression testing.
Understand how JSON Web Tokens work in API authentication. Decode JWT headers and payload claims to verify expiration timestamps and issuer signatures.
Learn when and how to use Base64 encoding for HTTP Basic Auth headers, data URIs, API secrets, and binary file transfers.