The JSON tab shows the current message in a Javascript Object Notation (JSON) format. This is in the standardized form as specified in the JSON Encoding Rules (JER) specification (ITU-T X.697).

The encoding will differ depending on the Tree View. If the Tag View is currently active, then JSON element names will be decoded tags (such as "CONTEXT_14"), except for UNIVERSAL tags, which are named for the type (such as "SEQUENCE"). The value of primitive elements will be a hexadecimal string of the encoded value.

If the Element View is active, then brace-text element names will be the same as shown in the Element View. Brace-text values will be the decoded value of the element.

When a node is clicked in the Tree View, the corresponding line will be highlighted in the JSON tab.