MRPack Validator — Check Your .mrpack for Errors

Before publishing or sharing a .mrpack, run it through this validator. It checks the manifest against the Modrinth spec, verifies every download URL is reachable, and recomputes each SHA-512 hash.

Validate a .mrpack file

Drag & drop a .mrpack here to validate

or click to choose

Choose .mrpack

What it checks

Schema compliance

formatVersion is set and is supported
game equals "minecraft"
versionId and name present
dependencies includes Minecraft and a supported loader

Files array

Each files[] entry has a path, at least one downloads URL, and SHA-512 hash
Paths do not contain .. traversal
Paths target only allowed folders (mods/, config/, resourcepacks/, etc.)

URL reachability

Each download URL returns 200 OK
Domain is on Modrinth's allowed-host list (modrinth.com, github.com, gitlab.com)

Hash verification

SHA-512 of each fetched file matches the manifest declaration
File size matches the declared fileSize

Why validate?

An invalid .mrpack will fail to install on at least one launcher. Validation catches issues early so you do not publish a pack only to receive bug reports the next day.