NextJSON is a browser-based tool for viewing, formatting, validating, and decoding JSON. Its nested JSON parser recursively finds and decodes JSON stored as escaped strings within other JSON, including multiple levels of encoding. It can also process escaped JSON strings copied directly from logs, with or without their outer quotes. Users can paste content into the input box, open a JSON or text file, or drag a file into the page. After formatting and decoding, they can explore the result in a tree view, expand or collapse nodes, copy the formatted JSON, or convert it to formats including CSV, XML, YAML, and Markdown. Other tools generate JSON schemas, convert schemas to JSON, compare JSON or text and show differences, compare lists, convert JSON to a single line, and convert between JSON and TOON. Typical uses include inspecting nested payloads in application logs, message queues, databases, APIs, and webhooks. Processing runs in the browser, and the site states that data is not uploaded or stored. No installation is required; files can be opened directly on the page.