---
title: "Mold — Mold v0.2.0"
url: https://daily.dev/posts/mold-mold-v0-2-0-s9ug73u7v
source_url: https://hexdocs.pm/mold
type: article
source: "ElixirStatus"
published: 2026-05-17T21:56:13.253Z
updated: 2026-05-17T21:56:38.412Z
tags: ["elixir"]
reading_time: 17
upvotes: 7
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Mold — Mold v0.2.0

**[ElixirStatus](https://daily.dev/sources/elixirstatus)** · 17 min read · 7 upvotes · 0 comments

## Summary

Mold v0.2.0 is a zero-dependency Elixir library for parsing external payloads (JSON APIs, webhooks, HTTP params) into clean Elixir terms. It defines a type system using plain Elixir data — atoms, functions, or tuples — covering scalar types (string, integer, float, boolean, atom), date/time types, collections (list, map, tuple), union types, and custom function types. Shared options like nilable, default, transform, validate, and in apply to all types. Maps support field-by-field parsing with flexible source key mapping, optional fields, and homogeneous key/value forms. The library returns structured errors with trace paths pointing to the exact failing location.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://hexdocs.pm/mold>

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---

Tags: [#elixir](https://daily.dev/tags/elixir)

[View this post on daily.dev](https://daily.dev/posts/mold-mold-v0-2-0-s9ug73u7v)