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# Ajv: Another JSON Schema Validator
The fastest JSON Schema validator for Node.js and browser. Supports draft-04/06/07.
[](https://travis-ci.org/ajv-validator/ajv)
[](https://www.npmjs.com/package/ajv)
[](https://www.npmjs.com/package/ajv/v/7.0.0-beta.0)
[](https://www.npmjs.com/package/ajv)
[](https://coveralls.io/github/ajv-validator/ajv?branch=master)
[](https://gitter.im/ajv-validator/ajv)
[](https://github.com/sponsors/epoberezkin)
## Ajv v7 beta is released
[Ajv version 7.0.0-beta.0](https://github.com/ajv-validator/ajv/tree/v7-beta) is released with these changes:
- to reduce the mistakes in JSON schemas and unexpected validation results, [strict mode](./docs/strict-mode.md) is added - it prohibits ignored or ambiguous JSON Schema elements.
- to make code injection from untrusted schemas impossible, [code generation](./docs/codegen.md) is fully re-written to be safe.
- to simplify Ajv extensions, the new keyword API that is used by pre-defined keywords is available to user-defined keywords - it is much easier to define any keywords now, especially with subschemas.
- schemas are compiled to ES6 code (ES5 code generation is supported with an option).
- to improve reliability and maintainability the code is migrated to TypeScript.
**Please note**:
- the support for JSON-Schema draft-04 is removed - if you have schemas using "id" attributes you have to replace them with "\$id" (or continue using version 6 that will be supported until 02/28/2021).
- all formats are separated to ajv-formats package - they have to be explicitely added if you use them.
See [release notes](https://github.com/ajv-validator/ajv/releases/tag/v7.0.0-beta.0) for the details.
To install the new version:
```bash
npm install ajv@beta
```
See [Getting started with v7](https://github.com/ajv-validator/ajv/tree/v7-beta#usage) for code example.
## Mozilla MOSS grant and OpenJS Foundation
[<img src="https://www.poberezkin.com/images/mozilla.png" width="240" height="68">](https://www.mozilla.org/en-US/moss/) [<img src="https://www.poberezkin.com/images/openjs.png" width="220" height="68">](https://openjsf.org/blog/2020/08/14/ajv-joins-openjs-foundation-as-an-incubation-project/)
Ajv has been awarded a grant from Mozilla’s [Open Source Support (MOSS) program](https://www.mozilla.org/en-US/moss/) in the “Foundational Technology” track! It will sponsor the development of Ajv support of [JSON Schema version 2019-09](https://tools.ietf.org/html/draft-handrews-json-schema-02) and of [JSON Type Definition](https://tools.ietf.org/html/draft-ucarion-json-type-definition-04).
Ajv also joined [OpenJS Foundation](https://openjsf.org/) – having this support will help ensure the longevity and stability of Ajv for all its users.
This [blog post](https://www.poberezkin.com/posts/2020-08-14-ajv-json-validator-mozilla-open-source-grant-openjs-foundation.html) has more details.
I am looking for the long term maintainers of Ajv – working with [ReadySet](https://www.thereadyset.co/), also sponsored by Mozilla, to establish clear guidelines for the role of a "maintainer" and the contribution standards, and to encourage a wider, more inclusive, contribution from the community.
## Please [sponsor Ajv development](https://github.com/sponsors/epoberezkin)
Since I asked to support Ajv development 40 people and 6 organizations contributed via GitHub and OpenCollective - this support helped receiving the MOSS grant!
Your continuing support is very important - the funds will be used to develop and maintain Ajv once the next major version is released.
Please sponsor Ajv via:
- [GitHub sponsors page](https://github.com/sponsors/epoberezkin) (GitHub will match it)
- [Ajv Open Collective️](https://opencollective.com/ajv)
Thank you.
#### Open Collective sponsors
<a href="https://opencollective.com/ajv"><img src="https://opencollective.com/ajv/individuals.svg?width=890"></a>
<a href="https://opencollective.com/ajv/organization/0/website"><img src="https://opencollective.com/ajv/organization/0/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/1/website"><img src="https://opencollective.com/ajv/organization/1/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/2/website"><img src="https://opencollective.com/ajv/organization/2/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/3/website"><img src="https://opencollective.com/ajv/organization/3/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/4/website"><img src="https://opencollective.com/ajv/organization/4/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/5/website"><img src="https://opencollective.com/ajv/organization/5/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/6/website"><img src="https://opencollective.com/ajv/organization/6/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/7/website"><img src="https://opencollective.com/ajv/organization/7/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/8/website"><img src="https://opencollective.com/ajv/organization/8/avatar.svg"></a>
<a href="https://opencollective.com/ajv/organization/9/website"><img src="https://opencollective.com/ajv/organization/9/avatar.svg"></a>
## Using version 6
[JSON Schema draft-07](http://json-schema.org/latest/json-schema-validation.html) is published.
[Ajv version 6.0.0](https://github.com/ajv-validator/ajv/releases/tag/v6.0.0) that supports draft-07 is released. It may require either migrating your schemas or updating your code (to continue using draft-04 and v5 schemas, draft-06 schemas will be supported without changes).
__Please note__: To use Ajv with draft-06 schemas you need to explicitly add the meta-schema to the validator instance:
```javascript
ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-06.json'));
```
To use Ajv with draft-04 schemas in addition to explicitly adding meta-schema you also need to use option schemaId:
```javascript
var ajv = new Ajv({schemaId: 'id'});
// If you want to use both draft-04 and draft-06/07 schemas:
// var ajv = new Ajv({schemaId: 'auto'});
ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-04.json'));
```
## Contents
- [Performance](#performance)
- [Features](#features)
- [Getting started](#getting-started)
- [Frequently Asked Questions](https://github.com/ajv-validator/ajv/blob/master/FAQ.md)
- [Using in browser](#using-in-browser)
- [Ajv and Content Security Policies (CSP)](#ajv-and-content-security-policies-csp)
- [Command line interface](#command-line-interface)
- Validation
- [Keywords](#validation-keywords)
- [Annotation keywords](#annotation-keywords)
- [Formats](#formats)
- [Combining schemas with $ref](#ref)
- [$data reference](#data-reference)
- NEW: [$merge and $patch keywords](#merge-and-patch-keywords)
- [Defining custom keywords](#defining-custom-keywords)
- [Asynchronous schema compilation](#asynchronous-schema-compilation)
- [Asynchronous validation](#asynchronous-validation)
- [Security considerations](#security-considerations)
- [Security contact](#security-contact)
- [Untrusted schemas](#untrusted-schemas)
- [Circular references in objects](#circular-references-in-javascript-objects)
- [Trusted schemas](#security-risks-of-trusted-schemas)
- [ReDoS attack](#redos-attack)
- Modifying data during validation
- [Filtering
ssm基于uniapp技术停车平台的设计和实现171756（附源码+数据库）
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ssm基于uniapp技术停车平台的设计和实现171756（附源码+数据库） （2000个子文件） 
cencode.c 2KB c99func.c 2KB parser.cpp 107KB functions.cpp 80KB extend.cpp 76KB ast.cpp 70KB eval.cpp 57KB prelexer.cpp 48KB context.cpp 32KB color_maps.cpp 32KB json.cpp 32KB inspect.cpp 30KB sass_context.cpp 29KB expand.cpp 27KB sass2scss.cpp 24KB util.cpp 20KB cssize.cpp 18KB file.cpp 17KB units.cpp 15KB sass_values.cpp 14KB binding.cpp 13KB test_subset_map.cpp 12KB bind.cpp 12KB check_nesting.cpp 10KB operators.cpp 10KB node.cpp 10KB output.cpp 9KB sass_functions.cpp 8KB constants.cpp 8KB error_handling.cpp 8KB emitter.cpp 7KB source_map.cpp 7KB environment.cpp 6KB lexer.cpp 6KB plugins.cpp 6KB position.cpp 5KB values.cpp 5KB sass.cpp 5KB sass_util.cpp 4KB color.cpp 4KB map.cpp 4KB custom_importer_bridge.cpp 3KB list.cpp 3KB utf8_string.cpp 3KB SharedPtr.cpp 3KB remove_placeholders.cpp 2KB to_value.cpp 2KB boolean.cpp 2KB listize.cpp 2KB number.cpp 2KB test_node.cpp 2KB to_c.cpp 2KB plugin.cpp 2KB factory.cpp 2KB test_superselector.cpp 2KB sass_context_wrapper.cpp 2KB subset_map.cpp 2KB null.cpp 2KB string.cpp 1KB backtrace.cpp 1KB base64vlq.cpp 1KB test_unification.cpp 892B custom_function_bridge.cpp 812B ast_fwd_decl.cpp 676B error.cpp 570B test_selector_difference.cpp 553B test_specificity.cpp 535B test_paths.cpp 509B create_string.cpp 438B diy.css 154KB base.css 84KB view.css 55KB common.css 38KB common.css 38KB common.css 38KB diy.css 14KB theme.css 13KB iconfont.css 11KB iconfont.css 11KB base.css 5KB theme.css 4KB theme.css 4KB theme.css 4KB jigsaw.css 2KB editor.css 794B expected.css 755B prettify.css 676B editor.css 647B expected.css 378B expected.css 240B expected.css 191B expected.css 156B expected.css 115B expected-data-importer.css 51B expected-importer.css 51B expected.css 46B setter-expected.css 43B expected.css 34B expected-orange.css 32B string-conversion-expected.css 30B共 2000 条
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