json-schema-lookup
Guidelines for querying schemastore.org. Use when you need to validate or discover options for config files relating to popular open source projects.
What this skill does
# JSON Schema Lookup via SchemaStore
Query schemastore.org's catalog of public configuration file schemas to validate structure, discover options, and check allowed values.
## API
- **Catalog**: `https://www.schemastore.org/api/json/catalog.json`
- Structure: `{ "schemas": [{ "name", "description", "fileMatch", "url", "versions"? }] }`
- **Individual schemas**: Fetch the `url` from the matching catalog entry
## Workflow
### 1. Find the schema
Search the catalog by name or filename pattern:
```bash
# Search by name (case-insensitive)
curl -s https://www.schemastore.org/api/json/catalog.json | jq '.schemas[] | select(.name | test("tsconfig"; "i")) | {name, url, fileMatch}'
# Search by filename match
curl -s https://www.schemastore.org/api/json/catalog.json | jq '.schemas[] | select(.fileMatch[]? | test("package\\.json")) | {name, url}'
```
Alternatively, use WebFetch on the catalog URL and ask for the relevant entry.
### 2. Fetch and inspect the schema
```bash
# List top-level properties
curl -s SCHEMA_URL | jq '.properties | keys'
# Inspect a specific field (type, enum values, description)
curl -s SCHEMA_URL | jq '.properties.FIELD_NAME'
# Check definitions/shared types (schemas use $ref to these)
curl -s SCHEMA_URL | jq '.definitions.DEF_NAME.properties'
# Get the full schema (warning - might be large!)
curl -s SCHEMA_URL | jq .
```
### 3. Common queries
```bash
# Find enum values for a field
curl -s SCHEMA_URL | jq '.properties.FIELD.enum'
# List nested properties (e.g. compilerOptions in tsconfig)
curl -s SCHEMA_URL | jq '.definitions.compilerOptionsDefinition.properties.compilerOptions.properties | keys'
# Find all required fields
curl -s SCHEMA_URL | jq '.required'
```
## Tips
- Some schemas use `allOf`/`anyOf` composition -- check those arrays for the full property set
- The `versions` field on catalog entries provides version-specific schema URLs when available
- Schema URLs vary: some point to `json.schemastore.org`, others to `raw.githubusercontent.com`
- For large schemas, query specific paths rather than dumping the entire document
- Cache the catalog response locally if making multiple lookups in one session
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