Flattened JSON objects list of Malaysia postcodes data, sorted by the postcode number.

Read the changelog.

To build the project locally, run:

bun install && bun run build

It will pull the latest data from the AsyrafHussin/malaysia-postcodes repository and generate the JSON files in the dist/ folder.

When users need to input their address, they often have to manually type their city and state, which can be prone to errors. Additionally, querying a full database for postcode information can be slow and resource-intensive.

This repository offers a lightweight and efficient solution to auto-populate city and state fields based on a postcode input. By extracting the first two digits from the postcode, we can quickly narrow down the possible locations and suggest accurate inputs using CDN.

Here's a simple example of how to use the repository to fetch city and state suggestions:

// Assuming 'postcodeInput' is a string containing the postcode entered by the user.
const [_, prefix] = postcodeInput.match(/^(\d{2})/) || [null, '']

let postcodes = []
if (prefix.length === 2) {
  // Fetch the relevant postcode data using the first two digits as a prefix.
  try {
    const cdnUrl = `https://raw.githubusercontent.com/acfatah/malaysia-postcodes-data/refs/heads/main/dist/${prefix}xxx-postcodes.json`
    const response = await fetch(cdnUrl)
    postcodes = await response.json()
  }
  catch (error) {
    // Handle fetch error (e.g., file not found, network issues)
  }
}
else if (postcodes.length > 0 && prefix.length > 2) {
  // If more than two digits are provided, we can filter the results further.
  postcodes = postcodes.filter(pc => pc.postcode.startsWith(prefix))
}

// Now you can use 'postcodes' to suggest city and state names.

https://cdn.jsdelivr.net/npm/@acfatah/malaysia-postcodes-data@2/dist/{prefix}xxx-postcodes.json
  

https://unpkg.com/@acfatah/malaysia-postcodes-data@2/dist/{prefix}xxx-postcodes.json
  

https://cdn.skypack.dev/@acfatah/malaysia-postcodes-data@v2/dist/{prefix}xxx-postcodes.json
  

• Performance: This method is fast as it avoids loading the entire postcode dataset into memory.

• Ease of Use: Developers can integrate this functionality without setting up and maintaining a separate database.

• Scalability: It scales well because each request only retrieves a small, specific subset of data.

By utilizing this approach, we can significantly improve user experience by streamlining the form completion process and reducing input errors.

You can use data from the dist/all-postcodes.json file to seed your database with Malaysia postcodes.

Each entry in all-postcodes.json is a flat JSON object (e.g. { "postcode": "43000", "city": "Kajang", "state": "Selangor" }), so you can iterate over the array and insert each record into your database using your preferred migration or seeding tool.