Ajv vs jaq
Ajv
ajv.js.orgjaq
github.comSide by side
| Figure | Ajv | jaq |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 2 |
| Spec score · JSON Tools | 8.0 (#10) | 8.9 (#1) |
| License | The project is distributed under the MIT License, which permits use, copying, modification, distribution, sublicensing, and sale subject to its terms. | The project repository identifies jaq as MIT-licensed. |
| Performance | Ajv generates optimized validation functions, and its documented model compiles schemas once for repeated validation. | The project publishes benchmarks comparing jaq with jq and gojq, and reports jaq as faster on many benchmarks. |
| Security | Ajv warns that schemas from untrusted sources can create performance and security risks and recommends limiting schema size and depth. | The project says jaq is memory-safe and does not let input data or filters initiate I/O, except that filters may read files before execution. |
| What it does | Ajv validates JSON data against declarative JSON Schema or JSON Type Definition schemas by compiling them into JavaScript code. | jaq is a Rust implementation of jq for querying and transforming structured data from the command line. |
Plans
In their own words
jaq
jaq is a free jq clone for querying and transforming data, available as both a command-line replacement and a Rust library for compiling and running jq programs. Alongside JSON, it handles YAML, CBOR, TOML, XML, CSV, and TSV, and can convert between those formats while applying a jq filter. Its jaq-core library supports multithreaded use and data types beyond JSON. jaq also accepts arbitrary values as object keys and can process strings containing arbitrary bytes, including invalid UTF-8. The project publishes benchmarks comparing jaq with jq and gojq, and reports faster results on many benchmarks. It states that jaq is memory-safe and prevents input data or filters from initiating I/O, although filters may read files before execution. The project also warns that it does not guard against resource exhaustion, so processing may use unlimited time, memory, or stack space. Binary downloads and installation instructions are provided for Linux, macOS, and Windows, and an online playground is available. jaq is MIT-licensed.