Ajv
Radar: Initial
MIT
The fastest JSON Schema validator for JavaScript — compiles schemas to validation functions and supports every modern dialect.
JSON Schema
Specifications it implements
What this tool does to each specification, in the role vocabulary. Follow a standard through to standards.apievangelist.com for what it actually specifies.
| Standard | Role | What that means |
|---|---|---|
| JSON Schema | validates |
Using this from an agent
- Interfaces
librarycli- Install
-
npm
ajv - Consumes
- json-schema, json
- Emits
- json
- Runtime
- Runs offline Deterministic Read-only No credentials
Where it applies
Jobs this tool actually does, and the surface each one is exercised on.
Validate a payload against a schema before sending it or after receiving it.
coding-agent
Check that structured output from a model conforms to an expected schema.
coding-agentai-platform
Directly relevant to agent plumbing — this is what turns "the model returned something JSON-shaped" into a checkable guarantee.
- Website
- https://ajv.js.org
- Repository
- https://github.com/ajv-validator/ajv
- License
- MIT — reported by the GitHub API, verified 2026-09-17
- Stars
- 14832 · last commit 2026-09-06
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All tools by adoption
/tools.json,
against the tool.schema.json
schema, using the roles.json
vocabulary. Start at /llms.txt.