vl.jsonFormat(…values)
Specify parsing of json format data.
jsonFormat Method OverviewjsonFormat API Reference# jsonFormat.parse(value)
If set to null, disable type inference based on the spec and only use type inference based on the data. Alternatively, a parsing directive object can be provided for explicit data types. Each property of the object corresponds to a field name, and the value to the desired data type (one of "number", "boolean", "date", or null (do not parse the field)). For example, "parse": {"modified_on": "date"} parses the modified_on field in each input record a Date value.
For "date", we parse data based using JavaScript’s Date.parse(). For Specific date formats can be provided (e.g., {foo: "date:'%m%d%Y'"}), using the d3-time-format syntax. UTC date format parsing is supported similarly (e.g., {foo: "utc:'%m%d%Y'"}). See more about UTC time
# jsonFormat.property(value)
The JSON property containing the desired data. This parameter can be used when the loaded JSON file may have surrounding structure or meta-data. For example "property": "values.features" is equivalent to retrieving json.values.features from the loaded JSON object.
# jsonFormat.type(value)
Type of input data: "json", "csv", "tsv", "dsv".
Default value: The default format type is determined by the extension of the file URL. If no extension is detected, "json" will be used by default.