ComfyUI-Lora-Manager/docs/metadata-json-schema.md

metadata.json Schema Documentation

This document defines the complete schema for .metadata.json files used by Lora Manager. These sidecar files store model metadata alongside model files (LoRA, Checkpoint, Embedding).

Overview

• File naming: <model_name>.metadata.json (e.g., my_lora.safetensors → my_lora.metadata.json)
• Format: JSON with UTF-8 encoding
• Purpose: Store model metadata, tags, descriptions, preview images, and Civitai/CivArchive integration data
• Extensibility: Unknown fields are preserved via _unknown_fields mechanism for forward compatibility

---

Base Fields (All Model Types)

These fields are present in all model metadata files.

Field	Type	Required	Auto-Updated	Description
file_name	string	✅ Yes	✅ Yes	Filename without extension (e.g., "my_lora")
model_name	string	✅ Yes	❌ No	Display name of the model. Default: file_name if no other source
file_path	string	✅ Yes	✅ Yes	Full absolute path to the model file (normalized with / separators)
size	integer	✅ Yes	❌ No	File size in bytes. Set at: Initial scan or download completion. Does not change thereafter.
modified	float	✅ Yes	❌ No	Import timestamp — Unix timestamp when the model was first imported/added to the system. Used for "Date Added" sorting. Does not change after initial creation.
sha256	string	⚠️ Conditional	✅ Yes	SHA256 hash of the model file (lowercase). LoRA: Required. Checkpoint: May be empty when hash_status="pending" (lazy hash calculation)
base_model	string	❌ No	❌ No	Base model type. Examples: "SD 1.5", "SDXL 1.0", "SDXL Lightning", "Flux.1 D", "Flux.1 S", "Flux.1 Krea", "Illustrious", "Pony", "AuraFlow", "Kolors", "ZImageTurbo", "Wan Video", etc. Default: "Unknown" or ""
preview_url	string	❌ No	✅ Yes	Path to preview image file
preview_nsfw_level	integer	❌ No	❌ No	NSFW level using bitmask values from Civitai: 1 (PG), 2 (PG13), 4 (R), 8 (X), 16 (XXX), 32 (Blocked). Default: 0 (none)
notes	string	❌ No	❌ No	User-defined notes
from_civitai	boolean	❌ No (default: true)	❌ No	Whether the model originated from Civitai
civitai	object	❌ No	⚠️ Partial	Civitai/CivArchive API data and user-defined fields
tags	array[string]	❌ No	⚠️ Partial	Model tags (merged from API and user input)
modelDescription	string	❌ No	⚠️ Partial	Full model description (from API or user)
civitai_deleted	boolean	❌ No (default: false)	❌ No	Whether the model was deleted from Civitai
favorite	boolean	❌ No (default: false)	❌ No	Whether the model is marked as favorite
exclude	boolean	❌ No (default: false)	❌ No	Whether to exclude from cache/scanning. User can set from false to true (currently no UI to revert)
db_checked	boolean	❌ No (default: false)	❌ No	Whether checked against archive database
skip_metadata_refresh	boolean	❌ No (default: false)	❌ No	Skip this model during bulk metadata refresh
metadata_source	string|null	❌ No	✅ Yes	Last provider that supplied metadata (see below)
last_checked_at	float	❌ No (default: 0)	✅ Yes	Unix timestamp of last metadata check
hash_status	string	❌ No (default: "completed")	✅ Yes	Hash calculation status: "pending", "calculating", "completed", "failed"

---

Model-Specific Fields

LoRA Models

LoRA models do not have a model_type field in metadata.json. The type is inferred from context or civitai.type (e.g., "LoRA", "LoCon", "DoRA").

Field	Type	Required	Auto-Updated	Description
usage_tips	string (JSON)	❌ No (default: "{}")	❌ No	JSON string containing recommended usage parameters

usage_tips JSON structure:

{
  "strength_min": 0.3,
  "strength_max": 0.8,
  "strength_range": "0.3-0.8",
  "strength": 0.6,
  "clip_strength": 0.5,
  "clip_skip": 2
}

Key	Type	Description
strength_min	number	Minimum recommended model strength
strength_max	number	Maximum recommended model strength
strength_range	string	Human-readable strength range
strength	number	Single recommended strength value
clip_strength	number	Recommended CLIP/embedding strength
clip_skip	integer	Recommended CLIP skip value

---

Checkpoint Models

Field	Type	Required	Auto-Updated	Description
model_type	string	❌ No (default: "checkpoint")	❌ No	Model type: "checkpoint", "diffusion_model"

---

Embedding Models

Field	Type	Required	Auto-Updated	Description
model_type	string	❌ No (default: "embedding")	❌ No	Model type: "embedding"

---

The civitai Field Structure

The civitai object stores the complete Civitai/CivArchive API response. Lora Manager preserves all fields from the API for future compatibility and extracts specific fields for use in the application.

Version-Level Fields (Civitai API)

Fields Used by Lora Manager:

Field	Type	Description
id	integer	Version ID
modelId	integer	Parent model ID
name	string	Version name (e.g., "v1.0", "v2.0-pruned")
nsfwLevel	integer	NSFW level (bitmask: 1=PG, 2=PG13, 4=R, 8=X, 16=XXX, 32=Blocked)
baseModel	string	Base model (e.g., "SDXL 1.0", "Flux.1 D", "Illustrious", "Pony")
trainedWords	array[string]	Trigger words for the model
type	string	Model type ("LoRA", "Checkpoint", "TextualInversion")
earlyAccessEndsAt	string|null	Early access end date (used for update notifications)
description	string	Version description (HTML)
model	object	Parent model object (see Model-Level Fields below)
creator	object	Creator information (see Creator Fields below)
files	array[object]	File list with hashes, sizes, download URLs (used for metadata extraction)
images	array[object]	Image list with metadata, prompts, NSFW levels (used for preview/examples)

Fields Stored but Not Currently Used:

Field	Type	Description
createdAt	string (ISO 8601)	Creation timestamp
updatedAt	string (ISO 8601)	Last update timestamp
status	string	Version status (e.g., "Published", "Draft")
publishedAt	string (ISO 8601)	Publication timestamp
baseModelType	string	Base model type (e.g., "Standard", "Inpaint", "Refiner")
earlyAccessConfig	object	Early access configuration
uploadType	string	Upload type ("Created", "FineTuned", etc.)
usageControl	string	Usage control setting
air	string	Artifact ID (URN format: urn:air:sdxl:lora:civitai:122359@135867)
stats	object	Download count, ratings, thumbs up count
videos	array[object]	Video list
downloadUrl	string	Direct download URL
trainingStatus	string|null	Training status (for on-site training)
trainingDetails	object|null	Training configuration

Model-Level Fields (civitai.model.*)

Fields Used by Lora Manager:

Field	Type	Description
name	string	Model name
type	string	Model type ("LoRA", "Checkpoint", "TextualInversion")
description	string	Model description (HTML, used for modelDescription)
tags	array[string]	Model tags (used for tags field)
allowNoCredit	boolean	License: allow use without credit
allowCommercialUse	array[string]	License: allowed commercial uses. Values: "Image" (sell generated images), "Video" (sell generated videos), "RentCivit" (rent on Civitai), "Rent" (rent elsewhere)
allowDerivatives	boolean	License: allow derivatives
allowDifferentLicense	boolean	License: allow different license

Fields Stored but Not Currently Used:

Field	Type	Description
nsfw	boolean	Model NSFW flag
poi	boolean	Person of Interest flag

Creator Fields (civitai.creator.*)

Both fields are used by Lora Manager:

Field	Type	Description
username	string	Creator username (used for author display and search)
image	string	Creator avatar URL (used for display)

Model Type Field (Top-Level, Outside civitai)

Field	Type	Values	Description
model_type	string	"checkpoint", "diffusion_model", "embedding"	Stored in metadata.json for Checkpoint and Embedding models. Note: LoRA models do not have this field; type is inferred from civitai.type or context.

User-Defined Fields (Within civitai)

For models not from Civitai or user-added data:

Field	Type	Description
trainedWords	array[string]	Trigger words — manually added by user
customImages	array[object]	Custom example images added by user

customImages Structure

Each custom image entry has the following structure:

{
  "url": "",
  "id": "short_id",
  "nsfwLevel": 0,
  "width": 832,
  "height": 1216,
  "type": "image",
  "meta": {
    "prompt": "...",
    "negativePrompt": "...",
    "steps": 20,
    "cfgScale": 7,
    "seed": 123456
  },
  "hasMeta": true,
  "hasPositivePrompt": true
}

Field	Type	Description
url	string	Empty for local custom images
id	string	Short ID or filename
nsfwLevel	integer	NSFW level (bitmask)
width	integer	Image width in pixels
height	integer	Image height in pixels
type	string	"image" or "video"
meta	object|null	Generation metadata (prompt, seed, etc.) extracted from image
hasMeta	boolean	Whether metadata is available
hasPositivePrompt	boolean	Whether a positive prompt is available

Minimal Non-Civitai Example

{
  "civitai": {
    "trainedWords": ["my_trigger_word"]
  }
}

Non-Civitai Example Without Trigger Words

{
  "civitai": {}
}

Example: User-Added Custom Images

{
  "civitai": {
    "trainedWords": ["custom_style"],
    "customImages": [
      {
        "url": "",
        "id": "example_1",
        "nsfwLevel": 0,
        "width": 832,
        "height": 1216,
        "type": "image",
        "meta": {
          "prompt": "example prompt",
          "seed": 12345
        },
        "hasMeta": true,
        "hasPositivePrompt": true
      }
    ]
  }
}

---

Metadata Source Values

The metadata_source field indicates which provider last updated the metadata:

Value	Source
"civitai_api"	Civitai API
"civarchive"	CivArchive API
"archive_db"	Metadata Archive Database
null	No external source (user-defined only)

---

Auto-Update Behavior

Fields Updated During Scanning

These fields are automatically synchronized with the filesystem:

• file_name — Updated if actual filename differs
• file_path — Normalized and updated if path changes
• preview_url — Updated if preview file is moved/removed
• sha256 — Updated during hash calculation (when hash_status="pending")
• hash_status — Updated during hash calculation
• last_checked_at — Timestamp of scan
• metadata_source — Set based on metadata provider

Fields Set Once (Immutable After Import)

These fields are set when the model is first imported/scanned and never change thereafter:

• modified — Import timestamp (used for "Date Added" sorting)
• size — File size at time of import/download

User-Editable Fields

These fields can be edited by users at any time through the Lora Manager UI or by manually editing the metadata.json file:

• model_name — Display name
• tags — Model tags
• modelDescription — Model description
• notes — User notes
• favorite — Favorite flag
• exclude — Exclude from scanning (user can set false→true, currently no UI to revert)
• skip_metadata_refresh — Skip during bulk refresh
• civitai.trainedWords — Trigger words
• civitai.customImages — Custom example images
• usage_tips — Usage recommendations (LoRA only)

---

Field Reference by Behavior

Required Fields (Must Always Exist)

• file_name
• model_name (defaults to file_name if not provided)
• file_path
• size
• modified
• sha256 (LoRA: always required; Checkpoint: may be empty when hash_status="pending")

Optional Fields with Defaults

Field	Default
base_model	"Unknown" or ""
preview_nsfw_level	0
from_civitai	true
civitai	{}
tags	[]
modelDescription	""
notes	""
civitai_deleted	false
favorite	false
exclude	false
db_checked	false
skip_metadata_refresh	false
metadata_source	null
last_checked_at	0
hash_status	"completed"
usage_tips	"{}" (LoRA only)
model_type	"checkpoint" or "embedding" (not present in LoRA models)

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Version History

Version	Date	Changes
1.0	2026-03	Initial schema documentation

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See Also

• JSON Schema Definition — Formal JSON Schema for validation