https://github.com/epoberezkin/json-schema-traverse
Traverse JSON Schema passing each schema object to callback
https://github.com/epoberezkin/json-schema-traverse
json-schema
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Traverse JSON Schema passing each schema object to callback
- Host: GitHub
- URL: https://github.com/epoberezkin/json-schema-traverse
- Owner: epoberezkin
- License: mit
- Created: 2017-06-04T18:39:07.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2021-07-26T06:52:21.000Z (almost 4 years ago)
- Last Synced: 2025-03-17T23:33:46.842Z (3 months ago)
- Topics: json-schema
- Language: JavaScript
- Size: 47.9 KB
- Stars: 100
- Watchers: 5
- Forks: 18
- Open Issues: 13
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
README
# json-schema-traverse
Traverse JSON Schema passing each schema object to callback
[](https://github.com/epoberezkin/json-schema-traverse/actions?query=workflow%3Abuild)
[](https://www.npmjs.com/package/json-schema-traverse)
[](https://coveralls.io/github/epoberezkin/json-schema-traverse?branch=master)
## Install
```
npm install json-schema-traverse
```
## Usage
```javascript
const traverse = require('json-schema-traverse');
const schema = {
properties: {
foo: {type: 'string'},
bar: {type: 'integer'}
}
};
traverse(schema, {cb});
// cb is called 3 times with:
// 1. root schema
// 2. {type: 'string'}
// 3. {type: 'integer'}
// Or:
traverse(schema, {cb: {pre, post}});
// pre is called 3 times with:
// 1. root schema
// 2. {type: 'string'}
// 3. {type: 'integer'}
//
// post is called 3 times with:
// 1. {type: 'string'}
// 2. {type: 'integer'}
// 3. root schema
```
Callback function `cb` is called for each schema object (not including draft-06 boolean schemas), including the root schema, in pre-order traversal. Schema references ($ref) are not resolved, they are passed as is. Alternatively, you can pass a `{pre, post}` object as `cb`, and then `pre` will be called before traversing child elements, and `post` will be called after all child elements have been traversed.
Callback is passed these parameters:
- _schema_: the current schema object
- _JSON pointer_: from the root schema to the current schema object
- _root schema_: the schema passed to `traverse` object
- _parent JSON pointer_: from the root schema to the parent schema object (see below)
- _parent keyword_: the keyword inside which this schema appears (e.g. `properties`, `anyOf`, etc.)
- _parent schema_: not necessarily parent object/array; in the example above the parent schema for `{type: 'string'}` is the root schema
- _index/property_: index or property name in the array/object containing multiple schemas; in the example above for `{type: 'string'}` the property name is `'foo'`
## Traverse objects in all unknown keywords
```javascript
const traverse = require('json-schema-traverse');
const schema = {
mySchema: {
minimum: 1,
maximum: 2
}
};
traverse(schema, {allKeys: true, cb});
// cb is called 2 times with:
// 1. root schema
// 2. mySchema
```
Without option `allKeys: true` callback will be called only with root schema.
## Enterprise support
json-schema-traverse package is a part of [Tidelift enterprise subscription](https://tidelift.com/subscription/pkg/npm-json-schema-traverse?utm_source=npm-json-schema-traverse&utm_medium=referral&utm_campaign=enterprise&utm_term=repo) - it provides a centralised commercial support to open-source software users, in addition to the support provided by software maintainers.
## Security contact
To report a security vulnerability, please use the
[Tidelift security contact](https://tidelift.com/security).
Tidelift will coordinate the fix and disclosure. Please do NOT report security vulnerability via GitHub issues.
## License
[MIT](https://github.com/epoberezkin/json-schema-traverse/blob/master/LICENSE)