#Json compare keys code#

If the shape of the payload is fixed, based on the property name (for example, all properties called registry hold Map objects).

'Guess' based on the structure of the data (for example, an array of two-member arrays).

Serialize the entire object to a string and prefix it with a type tag.

log (map2 ) // Map īecause JSON has no syntax space for annotating type metadata, in order to revive values that are not plain objects, you have to consider one of the following: Key = '' ? new Map (value ) : value, ) Ĭonsole.

const map = new Map (, ,, ] ) const jsonText = JSON. colorized, diff-like output fuzzy matching of modified array elements (when array elements are object hierarchies) keysOnly option to compare only the json. We can use the replacer to specify the entries to be serialized. Maps are normally serialized as objects with no properties. To transfer large numbers without loss of precision, serialize them as strings, and revive them to BigInts, or other appropriate arbitrary precision formats. Then you can use Object.keys to get all keys from the first object, and you can loop over these keys to see the difference in values in the two objects.

#Json compare keys code#

Your first code step would be to convert the JSON string to an object, using JSON.parse. So, for example, numbers in JSON text will have already been converted to JavaScript numbers, and may lose precision in the process. Also in a JSON string, all keys have to be surrounded by quotes (which is not the case in your example). Note that reviver is run after the value is parsed. For JSON text parsing to primitive values, reviver will be called once. Similar to the replacer parameter of JSON.stringify(), reviver will be last called on the root object with an empty string as the key and the root object as the value. If the reviver only transforms some values and not others, be certain to return all untransformed values as-is - otherwise, they will be deleted from the resulting object.

JSON fields that do not appear in the target row type will be omitted from the output, and target columns that do not match any JSON field will simply be NULL. JSON type coercion for these functions is 'best effort' and may not result in desired values for some types. Otherwise, the property is redefined to be the return value. JSON keys are matched to identical column names in the target row type. If the reviver function returns undefined (or returns no value - for example, if execution falls off the end of the function), the property is deleted from the object.

The reviver is called with the object containing the property being processed as this, and two arguments: key and value, representing the property name as a string (even for arrays) and the property value. Specifically, the computed value and all its properties (in a depth-first fashion, beginning with the most nested properties and proceeding to the original value itself) are individually run through the reviver. I want to compare keys(predefined by me) by their values and the result of that should be the name of the key and not the value which later i will use to save to another column's rows.If a reviver is specified, the value computed by parsing is transformed before being returned. In JSON Editor Online, you can open two files in the left and right panel of the editor. I have table which has a column of type json with name 'demographic'.