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Run npx skillmds@latest add mearman/schema-validate in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Who published Schema Validate?

Mearman (@mearman) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Schema Validate by mearman — Agent Skill

Name: Schema Validate
Author: Mearman

File contents

Validate JSON Against Schema

Validate JSON data files against a JSON Schema definition.

Usage

npx tsx scripts/validate.ts <json-file> --schema=<schema-file> [options]

Arguments

Argument	Required	Description
`json-file`	Yes	Path to the JSON file to validate

Options

Option	Description
`--schema=FILE`	Path to the JSON Schema file (required)
`--all-errors`	Report all errors, not just the first
`--strict`	Enable strict mode validation
`--verbose`	Show detailed validation output
`--format`	Output format: text (default), json

Output

Valid JSON:

Valid
  Schema: user-schema.json
  File: user.json

Invalid JSON:

Invalid (3 errors)
  1. /email: must match format "email"
  2. /age: must be >= 0
  3. /name: must be string

Script Execution

npx tsx scripts/validate.ts data.json --schema=schema.json
npx tsx scripts/validate.ts data.json --schema=schema.json --all-errors
npx tsx scripts/validate.ts data.json --schema=schema.json --format=json

Run from the json-schema plugin directory: ~/.claude/plugins/cache/json-schema/

Batch Validation

Validate multiple files against the same schema using glob patterns:

# Validate all JSON files in a directory
for f in data/*.json; do npx tsx scripts/validate.ts "$f" --schema=schema.json; done

JSON Output Format

When using --format=json:

{
  "valid": false,
  "file": "user.json",
  "schema": "user-schema.json",
  "errors": [
    {
      "path": "/email",
      "message": "must match format \"email\"",
      "keyword": "format"
    }
  ]
}

Error Messages

Common validation errors:

must be string - Type mismatch
must match format "..." - Format validation failed
must be >= N / must be <= N - Number range violation
must NOT have additional properties - Unknown property
must have required property '...' - Missing required field
must match pattern "..." - String pattern mismatch

Related Skills

Use schema-meta to validate that a schema is well-formed
Use schema-check to validate a JSON file against its embedded $schema

---name: schema-validatedescription: Validate JSON data against a JSON Schema. Use when the user asks to validate JSON against a schema, check if JSON conforms to a schema, test JSON data validity, or verify JSON structure matches a schema definition.---# Validate JSON Against SchemaValidate JSON data files against a JSON Schema definition.## Usage```bashnpx tsx scripts/validate.ts <json-file> --schema=<schema-file> [options]```### Arguments| Argument | Required | Description ||----------|----------|-------------|| `json-file` | Yes | Path to the JSON file to validate |### Options| Option | Description ||--------|-------------|| `--schema=FILE` | Path to the JSON Schema file (required) || `--all-errors` | Report all errors, not just the first || `--strict` | Enable strict mode validation || `--verbose` | Show detailed validation output || `--format` | Output format: text (default), json |### OutputValid JSON:```Valid Schema: user-schema.json File: user.json```Invalid JSON:```Invalid (3 errors) 1. /email: must match format "email" 2. /age: must be >= 0 3. /name: must be string```## Script Execution```bashnpx tsx scripts/validate.ts data.json --schema=schema.jsonnpx tsx scripts/validate.ts data.json --schema=schema.json --all-errorsnpx tsx scripts/validate.ts data.json --schema=schema.json --format=json```Run from the json-schema plugin directory: `~/.claude/plugins/cache/json-schema/`## Batch ValidationValidate multiple files against the same schema using glob patterns:```bash# Validate all JSON files in a directoryfor f in data/*.json; do npx tsx scripts/validate.ts "$f" --schema=schema.json; done```## JSON Output FormatWhen using `--format=json`:```json{ "valid": false, "file": "user.json", "schema": "user-schema.json", "errors": [ { "path": "/email", "message": "must match format \"email\"", "keyword": "format" } ]}```## Error MessagesCommon validation errors:- `must be string` - Type mismatch- `must match format "..."` - Format validation failed- `must be >= N` / `must be <= N` - Number range violation- `must NOT have additional properties` - Unknown property- `must have required property '...'` - Missing required field- `must match pattern "..."` - String pattern mismatch## Related Skills- Use `schema-meta` to validate that a schema is well-formed- Use `schema-check` to validate a JSON file against its embedded `$schema`

Frequently asked questions

Schema Validate