Ajv vs jsonfmt.dev
Ajv
ajv.js.org
jsonfmt.dev
jsonfmt.devSide by side
| Figure | Ajv | jsonfmt.dev |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 3 |
| Spec score · JSON Tools | 8.0 (#10) | 7.9 (#13) |
| Integrations | Ajv documents use in Node.js, browsers, Electron apps, and WeChat mini-apps, and provides plugins such as ajv-formats, ajv-errors, and ajv-i18n. | The maker describes an MCP server package, jsonfmt-mcp, that exposes JSON-processing tools to MCP-compatible AI clients. |
| Support | Ajv is included in a Tidelift subscription for centralized support in addition to support from maintainers. | The API pricing lists community support for anonymous access, email support for the free key tier, and priority support for Pro. |
Plans
In their own words
jsonfmt.dev
jsonfmt.dev is a web-based JSON formatter, beautifier and validator, with an HTTPS API for JSON processing. The formatter offers 2-space, 4-space or tab indentation, optional key sorting and depth control. It validates JSON against RFC 8259 and reports line and column errors. Other tools can repair common malformed JSON, compare two documents and convert formats including YAML, CSV, XML, TypeScript, SQL, GraphQL and Protobuf. The toolkit also includes a JWT decoder, JSON Schema validator, JSONPath evaluator and JSONL tools. The maker says the core browser tool handles JSON locally without sending its contents to the server, and continues to work offline after loading; it can also be installed as a Progressive Web App. API options include anonymous access limited to 10 requests per minute, a free API key tier with 100 requests per minute and 1,000 per month, and Pro API at $9, paid once for 1,000 requests per minute and 50,000 per month. Share links encode JSON in the URL fragment, and anyone with the link can access its contents.