Mapify-ts is a class that provides methods to serialize and deserialize objects supporting Map.
Read Medium article. or check the stats about +6k downloads (May 2024).
Native JSON package does not support stringify Map out of the box.
Example 1:
const myMap = new Map();
myMap.set('foo', 'bar');
myMap.set('hello', 'world');
console.log(JSON.stringify(myMap)); // {}
Example 2:
type MyType = {
foo: string;
hello: string;
};
const myMap = new Map<MyType, string>();
myMap.set({ foo: 'bar', hello: 'world' }, 'foobar');
console.log(JSON.stringify(myMap)); // {}
Mapify-ts will serialize the map to a native javascript object. Also enables to deserialize the object back to a Map.
This native javascript object can be serialized to JSON using stringify. And can be deserialized back.
Examples:
You can store the serialized string in a database and deserialize it later.
You can send the serialized string over the network and deserialize it on the other side.
Hope you enjoy it!
Serialize a Map object to a native javascript object.
Example:
type MyType = {
foo: string;
hello: string;
};
const myMap = new Map<MyType, string>();
myMap.set({ foo: 'bar', hello: 'world' }, 'foobar');
console.log(myMap); // #1 console output
console.log(JSON.stringify(myMap)); // #2 console output
console.log(MapifyTs.serialize(myMap)); // #3 console output
console.log(JSON.stringify(MapifyTs.serialize(myMap))); // #4 console output
Following the example above, the console output will be:
This is the raw output from terminal.
> console.log(myMap);
Map(1) { { foo: 'bar', hello: 'world' } => 'foobar' }
Although it is not possible to stringify the map, it is possible to print it to the console.
This is the output from terminal after stringify the map.
> console.log(JSON.stringify(myMap));
{}
The stringify method does not support Map out of the box.
This is the output from terminal after MapifyTs.serialize the map.
> console.log(MapifyTs.serialize(myMap));
{
__map__: { '__map:0__': { foo: 'bar', hello: 'world' } },
'__map:0__': 'foobar'
}
The MapifyTs.serialize method will serialize the map to a native javascript object mapping the keys to a __map__ parent property.
This is the output from terminal after stringify the output from MapifyTs.serialize.
> console.log(JSON.stringify(MapifyTs.serialize(myMap)));
{"__map__":{"__map:0__":{"foo":"bar","hello":"world"}},"__map:0__":"foobar"}
The stringify method supports the output from MapifyTs.serialize.
Deserialize a native javascript object to a Map object.
Example:
type MyType = {
foo: string;
hello: string;
};
const myMap = new Map<MyType, string>();
myMap.set({ foo: 'bar', hello: 'world' }, 'foobar');
const serialized = MapifyTs.serialize(myMap);
const strSerialized = JSON.stringify(serialized);
// -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
// you can store the serialized string in a database
// and deserialize it later
// -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
// you can send the serialized string over the network
// and deserialize it on the other side
// -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
const jsonDeserialized = JSON.parse(strSerialized);
const deserialized = MapifyTs.deserialize(jsonDeserialized);
console.log(deserialized); // #1 console output
Following the example above, the console output will be:
This is the output from terminal after MapifyTs.deserialize the object.
> console.log(deserialized);
Map(1) { { foo: 'bar', hello: 'world' } => 'foobar' }
The MapifyTs.deserialize method will deserialize the native javascript object to a Map object.
- Node 16.20+
- NPM 8.19.4+
npm i mapify-ts
import MapifyTs from 'mapify-ts';
- https://pauloe-me.medium.com/typescript-npm-package-publishing-a-beginners-guide-40b95908e69c
- https://howtodoinjava.com/typescript/maps/
- Force new version
- Initial release
- Serialize and deserialize Map objects
- Serialize and deserialize Map objects with custom keys
- Serialize and deserialize Map objects with custom values
- Serialize and deserialize Map objects with custom keys and values
- Serialize and deserialize Map objects with custom keys and values with nested Maps
- Serialize and deserialize Map objects with custom keys and values with nested Maps with custom keys and values
@gustavoyasunaka @RodrigoWebDev
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