Side by side
Ajv vs jaq
Both stand on json tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Self-hostedWeb
Choose Ajv if you need a free JavaScript library for JSON Schema or JTD validation, with compiled functions and TypeScript support. Consider its browser Content Security Policy requirement and schema security guidance when planning deployment or handling untrusted schemas.
Visit Ajv Free plan Open source APILinuxMac+3
jaq brings jq-style filtering to multiple data formats and also offers a Rust library. Its lack of resource-use limits is worth considering when processing untrusted or costly workloads.
Visit jaqThe facts
| Ajv | jaq | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Self-hosted, Web | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 2 |
| Maker | Not published | Not published |
| Website | ajv.js.org | github.com |
| On json tools | #5 of 29 | #1 of 29 |
Ajv: what it does well
- Supports five JSON Schema drafts and JSON Type Definition.
- Reuses compiled validators for repeated checks.
- Compiled validators can act as TypeScript type guards.
- Compiles JTD parsers and serializers.
- Runs in Node.js and browsers.
What to know first
- JSON Schema format checks require the separate ajv-formats plugin.
- Browser runtime compilation with Content Security Policy requires 'unsafe-eval'.
- Untrusted schemas can pose performance and security risks.
jaq: what it does well
- Free, open-source, and MIT-licensed.
- Supports seven data formats.
- Available as a CLI and Rust library.
- Handles arbitrary-byte strings and object keys.
- Offers binaries and an online playground.
What to know first
- Does not guard against resource exhaustion.
- File reads may occur before filter execution.