JSPM

Safely serialize JavaScript expressions to a superset of JSON, which includes Dates, BigInts, and more.

Key features

• 🍱 Reliable serialization and deserialization
• 🔐 Type safety with autocompletion
• 🐾 Negligible runtime footprint
• 💫 Framework agnostic
• 🛠 Perfect fix for Next.js's serialisation limitations in getServerSideProps and getInitialProps

Backstory

At Blitz, we have struggled with the limitations of JSON. We often find ourselves working with Date, Map, Set or BigInt, but JSON.stringify doesn't support any of them without going through the hassle of converting manually!

Superjson solves these issues by providing a thin wrapper over JSON.stringify and JSON.parse.

Getting started

Install the library with your package manager of choice, e.g.:

yarn add superjson

Basic Usage

The easiest way to use Superjson is with its stringify and parse functions. If you know how to use JSON.stringify, you already know Superjson!

Easily stringify any expression you’d like:

import superjson from 'superjson';

const jsonString = superjson.stringify({ date: new Date(0) });

// jsonString === '{"json":{"date":"1970-01-01T00:00:00.000Z"},"meta":{"values":{date:"Date"}}}'

And parse your JSON like so:

const object = superjson.parse<{ date: Date }>(jsonString);

// object === { date: new Date(0) }

Advanced Usage

For cases where you want lower level access to the json and meta data in the output, you can use the serialize and deserialize functions.

One great use case for this is where you have an API that you want to be JSON compatible for all clients, but you still also want to transmit the meta data so clients can use superjson to fully deserialize it.

For example:

const object = {
  normal: 'string',
  timestamp: new Date(),
  test: /superjson/,
};

const { json, meta } = superjson.serialize(object);

/*
json = {
  normal: 'string',
  timestamp: "2020-06-20T04:56:50.293Z",
  test: "/blitz/",
};

// note that `normal` is not included here; `meta` only has special cases
meta = {
  timestamp: ['date'],
  test: ['regexp'],
};
*/

Using with Next.js getServerSideProps, getInitialProps, and getStaticProps

The getServerSideProps, getInitialProps, and getStaticProps data hooks provided by Next.js do not allow you to transmit Javascript objects like Dates. It will error unless you convert Dates to strings, etc.

Thankfully, Superjson is a perfect tool to bypass that limitation!

import { useMemo } from 'react';
import superjson from 'superjson';

export const getServerSideProps = async () => {
  const products = [{ name: 'Hat', publishedAt: new Date(0) }];

  const dataString = superjson.stringify(products);

  return {
    props: {
      dataString,
    },
  };
};

export default function Page({ dataString }) {
  const products = useMemo(() => superjson.parse(dataString), [dataString]);

  return (
    <div>
      <h1>Products</h1>
      {products.map(product => (
        <p key={product.id}>
          <span>Name: {product.name}</span>
          {/* Note: publishedAt is an actual Date object! */}
          <span>Published at: {product.publishedAt.toISOString()}</span>
        </p>
      ))}
    </div>
  );
}

API

serialize

Serializes any JavaScript value into a JSON-compatible object.

Examples

const object = {
  normal: 'string',
  timestamp: new Date(),
  test: /superjson/,
};

const { json, meta } = serialize(object);

Returns json and meta, both JSON-compatible values.

deserialize

Deserializes the output of Superjson back into your original value.

Examples

const { json, meta } = serialize(object);

deserialize({ json, meta });

Returns your original value.

stringify

Serializes and then stringifies your JavaScript value.

Examples

const object = {
  normal: 'string',
  timestamp: new Date(),
  test: /superjson/,
};

const jsonString = stringify(object);

Returns string.

parse

Parses and then deserializes the JSON string returned by stringify.

Examples

const jsonString = stringify(object);

parse(jsonString);

Returns string.

Superjson supports many extra types which JSON does not. You can serialize all these:

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Dylan Brookes 💻 📖 🎨 ⚠️

Simon Knott 💻 🤔 ⚠️ 📖

Brandon Bayer 🤔

Jeremy Liberman ⚠️ 💻

This project follows the all-contributors specification. Contributions of any kind welcome!

Prior art

Other libraries that aim to solve a similar problem:

• Serialize JavaScript by Eric Ferraiuolo
• devalue by Rich Harris