<img align="right" alt="Ajv logo" width="160" src="http://epoberezkin.github.io/ajv/images/ajv_logo.png">
# Ajv: Another JSON Schema Validator
The fastest JSON Schema validator for Node.js and browser with draft 6 support.
[](https://travis-ci.org/epoberezkin/ajv)
[](https://www.npmjs.com/package/ajv)
[](https://github.com/epoberezkin/ajv/tree/beta)
[](https://www.npmjs.com/package/ajv)
[](https://coveralls.io/github/epoberezkin/ajv?branch=master)
[](https://greenkeeper.io/)
[](https://gitter.im/ajv-validator/ajv)
__Please note__: Ajv [version 6](https://github.com/epoberezkin/ajv/tree/beta) with [JSON Schema draft-07](http://json-schema.org/work-in-progress) support is released. Use `npm install ajv@beta` to install.
## Using version 5
[JSON Schema draft-06](https://trac.tools.ietf.org/html/draft-wright-json-schema-validation-01) is published.
[Ajv version 5.0.0](https://github.com/epoberezkin/ajv/releases/tag/5.0.0) that supports draft-06 is released. It may require either migrating your schemas or updating your code (to continue using draft-04 and v5 schemas).
__Please note__: To use Ajv with draft-04 schemas you need to explicitly add meta-schema to the validator instance:
```javascript
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/epoberezkin/ajv/blob/master/FAQ.md)
- [Using in browser](#using-in-browser)
- [Command line interface](#command-line-interface)
- Validation
- [Keywords](#validation-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)
- Modifying data during validation
- [Filtering data](#filtering-data)
- [Assigning defaults](#assigning-defaults)
- [Coercing data types](#coercing-data-types)
- API
- [Methods](#api)
- [Options](#options)
- [Validation errors](#validation-errors)
- [Related packages](#related-packages)
- [Packages using Ajv](#some-packages-using-ajv)
- [Tests, Contributing, History, License](#tests)
## Performance
Ajv generates code using [doT templates](https://github.com/olado/doT) to turn JSON schemas into super-fast validation functions that are efficient for v8 optimization.
Currently Ajv is the fastest and the most standard compliant validator according to these benchmarks:
- [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark) - 50% faster than the second place
- [jsck benchmark](https://github.com/pandastrike/jsck#benchmarks) - 20-190% faster
- [z-schema benchmark](https://rawgit.com/zaggino/z-schema/master/benchmark/results.html)
- [themis benchmark](https://cdn.rawgit.com/playlyfe/themis/master/benchmark/results.html)
Performance of different validators by [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark):
[](https://github.com/ebdrup/json-schema-benchmark/blob/master/README.md#performance)
## Features
- Ajv implements full JSON Schema [draft 6](http://json-schema.org/) and draft 4 standards:
- all validation keywords (see [JSON Schema validation keywords](https://github.com/epoberezkin/ajv/blob/master/KEYWORDS.md))
- full support of remote refs (remote schemas have to be added with `addSchema` or compiled to be available)
- support of circular references between schemas
- correct string lengths for strings with unicode pairs (can be turned off)
- [formats](#formats) defined by JSON Schema draft 4 standard and custom formats (can be turned off)
- [validates schemas against meta-schema](#api-validateschema)
- supports [browsers](#using-in-browser) and Node.js 0.10-8.x
- [asynchronous loading](#asynchronous-schema-compilation) of referenced schemas during compilation
- "All errors" validation mode with [option allErrors](#options)
- [error messages with parameters](#validation-errors) describing error reasons to allow creating custom error messages
- i18n error messages support with [ajv-i18n](https://github.com/epoberezkin/ajv-i18n) package
- [filtering data](#filtering-data) from additional properties
- [assigning defaults](#assigning-defaults) to missing properties and items
- [coercing data](#coercing-data-types) to the types specified in `type` keywords
- [custom keywords](#defining-custom-keywords)
- draft-6 keywords `const`, `contains` and `propertyNames`
- draft-6 boolean schemas (`true`/`false` as a schema to always pass/fail).
- keywords `switch`, `patternRequired`, `formatMaximum` / `formatMinimum` and `formatExclusiveMaximum` / `formatExclusiveMinimum` from [JSON-schema extension proposals](https://github.com/json-schema/json-schema/wiki/v5-Proposals) with [ajv-keywords](https://github.com/epoberezkin/ajv-keywords) package
- [$data reference](#data-reference) to use values from the validated data as values for the schema keywords
- [asynchronous validation](#asynchronous-validation) of custom formats and keywords
Currently Ajv is the only validator that passes all the tests from [JSON Schema Test Suite](https://github.com/json-schema/JSON-Schema-Test-Suite) (according to [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark), apart from the test that requires that `1.0` is not an integer that is impossible to satisfy in JavaScript).
## Install
```
npm install ajv
```
or to install [version 6](https://github.com/epoberezkin/ajv/tree/beta):
```
npm install ajv@beta
```
## <a name="usage"></a>Getting started
Try it in the Node.js REPL: https://tonicdev.com/npm/ajv
The fastest validation call:
```javascript
var Ajv = require('ajv');
var ajv = new Ajv(); // options can be passed, e.g. {allErrors: true}
var validate = ajv.compile(schema);
var valid = validate(data);
if (!valid) console.log(validate.errors);
```
or with less code
```javascript
// ...
var valid = ajv.validate(schema, data);
if (!valid) console.log(ajv.errors);
// ...
```
or
```javascript
// ...
var valid = ajv.addSchema(schema, 'mySchema')
.validate('mySchema', data);
if (!valid) console.log(ajv.errorsText());
// ...
```
See [API](#api) and [Options](#options) for more details.
Ajv compiles schemas to functions and caches them in all cases (using schema serialized with [fast-json-stable-stringify](https://github.com/epoberezkin/fast-json-stable-stringify) or a custom function as a key), so that the next time the same schema is used (not necessarily the same object instance) it won't be compiled again.
The best performance is achieved when using compiled functions returned by `compile` or `getSchema` methods (there is no additional function call).
__Please note__: every time a validation function or `ajv.validate` are called `errors` property is overwritten. You need to copy `errors` array reference to another variable if you want to use it later (e.g., in the callback). See [Validation errors](#validation-errors)
## Using in browser
You can require Ajv directly from
Qt-5.12.12源码
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Qt-5.12.12源码 （2001个子文件） 
gstvideoconnector.c 18KB tst_qcamera.cpp 104KB mfvideorenderercontrol.cpp 78KB qgstreamerplayersession.cpp 67KB evrcustompresenter.cpp 60KB qpaintervideosurface.cpp 58KB mfplayersession.cpp 57KB directshowplayerservice.cpp 57KB qwebglcontext.cpp 57KB qgstutils.cpp 57KB tst_qmediarecorder.cpp 55KB camerabinsession.cpp 53KB qdeclarativeaudio.cpp 53KB qwinrtcameracontrol.cpp 52KB qmediaplayer.cpp 51KB tst_qmediaplayerbackend.cpp 51KB androidcamera.cpp 50KB tst_qvideowidget.cpp 50KB tst_qmediaplayer.cpp 50KB tst_qmediaplaylist.cpp 47KB qvideoframe.cpp 44KB qcamera.cpp 43KB dscamerasession.cpp 43KB tst_qaudiooutput.cpp 43KB tst_qpaintervideosurface.cpp 42KB tst_qdeclarativeaudio.cpp 41KB bbcamerasession.cpp 40KB tst_qaudioinput.cpp 38KB tst_qvideoframe.cpp 38KB qdeclarativecamera.cpp 37KB qgstreamercapturesession.cpp 36KB directshowmetadatacontrol.cpp 35KB tst_qdeclarativevideo.cpp 35KB qsoundeffect_pulse_p.cpp 35KB qmediarecorder.cpp 33KB qmediaserviceprovider.cpp 33KB qandroidcamerasession.cpp 33KB tst_qvideosurfaceformat.cpp 30KB qdeclarativevideooutput.cpp 30KB tst_qdeclarativevideooutput.cpp 29KB qwinrtmediaplayercontrol.cpp 28KB qvideowidget.cpp 27KB tst_qcamerabackend.cpp 26KB qwebglintegration.cpp 26KB qalsaaudioinput.cpp 25KB qalsaaudiooutput.cpp 25KB qmediaplaylist.cpp 24KB qandroidmediaplayercontrol.cpp 24KB qmediaencodersettings.cpp 24KB videosurfacefilter.cpp 23KB tst_qmediaresource.cpp 23KB qandroidcapturesession.cpp 23KB qopenslesaudiooutput.cpp 23KB qvideosurfacegstsink.cpp 22KB qcameraexposure.cpp 22KB qwindowsaudioinput.cpp 22KB mftvideo.cpp 22KB qdeclarative_audioengine_p.cpp 21KB qvideosurfaceformat.cpp 21KB qcameraimagecapture.cpp 21KB qaudiooutput_pulse.cpp 21KB qgstreameraudiodecodersession.cpp 20KB tst_qmediatimerange.cpp 20KB qsgvideonode_yuv.cpp 20KB mmrenderermediaplayercontrol.cpp 20KB qplaylistfileparser.cpp 20KB qgstreamerplayercontrol.cpp 19KB qaudioinput_pulse.cpp 19KB evrd3dpresentengine.cpp 19KB qsoundeffect.cpp 19KB mfmetadatacontrol.cpp 19KB tst_qaudiodecoderbackend.cpp 19KB tst_webgl.cpp 19KB qdeclarativecamerarecorder.cpp 19KB tst_qgraphicsvideoitem.cpp 19KB qwindowsaudiooutput.cpp 19KB qwasapiaudiooutput.cpp 18KB qgstvideorenderersink.cpp 18KB qdeclarativevideooutput_render.cpp 18KB qcamerafocus.cpp 18KB qdeclarativeplaylist.cpp 18KB qgstreamervideooverlay.cpp 18KB qmediatimerange.cpp 18KB directshowpin.cpp 18KB player.cpp 18KB camerabinfocus.cpp 18KB qdeclarative_sound_p.cpp 18KB qaudiobuffer.cpp 18KB qwasapiaudioinput.cpp 18KB tst_qmediaplaylistnavigator.cpp 18KB mfaudiodecodercontrol.cpp 17KB camerabinimageprocessing.cpp 17KB tst_qaudionamespace.cpp 17KB qradiotuner.cpp 16KB qopenslesaudioinput.cpp 16KB qdeclarativeradio.cpp 16KB directshowcameraexposurecontrol.cpp 16KB qwinrtabstractvideorenderercontrol.cpp 16KB qwindowsaudiodeviceinfo.cpp 16KB qnxaudiooutput.cpp 16KB共 2001 条
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