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If you want to learn more about JSON, jump to the JSON Explained section of this page.
It’s meant to be a human-readable and compact solution to represent a complex data structure and facilitate data-interchange between systems.
There are tons of reasons why you would want to use JSON:
There are just a few rules that you need to remember:
Example using the ‘dangerous’ eval():
Example using JSON.parse():
Example using JSON.stringify():
The website JSON.org maintains an extensive list of JSON libraries and they are categorized in programming languages. Unfortunately, there are so many libraries out there that it’s very hard to chose one! Note that VERY few JSON libraries have strict adherence to the JSON specification and this can lead to parsing problems between systems.
These are my recommended JSON libraries:
JSON Schema definitions, JSON content, and referenced schema definitions can be entered, or pasted into, their corresponding text areas. Up to 8 JSON Schema Reference ($ref) definitions can be loaded (use the tabs 1 to 8 to navigate between each).
The Validate button runs the schema validator and displays the validation result in the Results text area. If any of the content is invalid, its text area will be bordered in red.
For the reference schemas, the tabs corresponding to any invalid content will also be bordered in red.
To reset all entry areas press the Reset All button.
Pre-defined content is provided through a catalog of examples to work with.
These are available using Import at the top right. The Import window shows the catalog contents. Select the item to work with from the Items selection list and press the Load button. The Import window is modeless, it can be left open while working with the content if desired.
JSON Schema provides data definition for JSON content. It can be used to enable validation of content against the schema, or for tools / applications to generate or manipulate content with guidance from the constraints defined by the schema.
The specification of JSON Schema is managed through the IETF, in the following draft specifications (version 4),
The following resources are available,
There are JSON Schema validation libraries for a wide variety of programming languages and runtime platforms. See the Software page on the JSON Schema home site for a list.
The current version is draft-07!
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents.
The JSON Schema project intends to shepherd the Core, Validation, and Hyper-Schema specifications to RFC status. Currently, we are continuing to improve our self-published Internet-Drafts. The next step will be to get the drafts adopted by an IETF Working Group.
In the meantime, publication of Internet-Draft documents can be tracked through the IETF:
Internet-Drafts expire after six months, so our goal is to publish often enough to always have a set of unexpired drafts available.
There may be brief gaps as we wrap up each draft and finalize the text.
The intention, particularly for vocabularies such as validation which have been widely implemented, is to remain as compatible as possible from draft to draft. However, these are still drafts, and given a clear enough need validated with the user community, major changes can occur.
Progress on the next set of Internet-Drafts can be tracked on GitHub. The draft-08 milestone will track the evolving scope of the draft
The JSON document being validated or described we call the instance, and the document containing the description is called the schema.
The most basic schema is a blank JSON object, which constrains nothing, allows anything, and describes nothing:
You can apply constraints on an instance by adding validation keywords to the schema. For example, the “type” keyword can be used to restrict an instance to an object, array, string, number, boolean, or null:
JSON Schema is hypermedia ready, and ideal for annotating your existing JSON-based HTTP API. JSON Schema documents are identified by URIs, which can be used in HTTP Link headers, and inside JSON Schema documents to allow recursive definitions.
Interested? Check out:
We encourage updating to the latest specification, as described by the draft-07 meta-schemas. However, if you are still using draft-04, you may be interested in:
Questions? Feeling helpful? Get involved on:
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