json-schema-traverse

Traverse JSON Schema passing each schema object to callback

# Install

npm install json-schema-traverse

# Usage

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

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.

# License

MIT