Developer and data tools

A small payload should not require a new project just to inspect it. Use JSON Formatter to expand compact data, JSON Validator to locate a syntax problem, or JSON Minifier to remove insignificant whitespace. CSV, YAML, XML and TOML tools handle common handoffs between applications. Regular expression, URL and encoding utilities help isolate the part of an input that needs attention. Processing happens in your browser, including text you paste into an editor.

Choose validation according to the question. Valid JSON syntax does not prove that a payload has the fields your API requires; that needs a schema or application-specific checks. Similarly, decoding a JWT reveals its claims but does not verify its signature. Base64 is an encoding, so anyone with the encoded value can recover the original. Hashing and encryption tools serve different purposes and should be selected accordingly.

Conversions also involve choices. A CSV value such as 00123 might be an identifier whose leading zeros matter. Nested JSON does not always map neatly to spreadsheet columns, and XML attributes need a representation in JSON. Read each tool's mapping rules, inspect a short sample first and compare the exported result with the original before using it in a larger workflow.