JSON.parse to convert JSON back into an object.… The resulting json string is called a JSON-encoded or serialized or stringified or marshalled object.… But they must obey the same JSON format.… Adding a comment to JSON makes it invalid.… JavaScript provides methods JSON.stringify to serialize into JSON and JSON.parse to read from JSON.
:
response.text() – read the response and return as text,
response.json() – parse the response as JSON… JSON-encoded),
FormData object, to submit the data as multipart/form-data,
Blob/BufferSource to send… The JSON format is used most of the time.… But, as we’re going to send JSON, we use headers option to send application/json instead, the correct… Content-Type for JSON-encoded data.
Extending Error.As an example, let’s consider a function readUser(json) that should read JSON with user… Here’s an example of how a valid json may look:… If it receives malformed json, then it throws SyntaxError.… But even if json is syntactically correct, that doesn’t mean that it’s a valid user, right?… Our function readUser(json) will not only read JSON, but check (“validate”) the data.
XPath and other XML methods) or HTML document (based on the MIME type of the received data),
"json… " – get as JSON (parsed automatically).… For example, let’s get the response as JSON:… Or, if we like JSON more, then JSON.stringify and send as a string.… decode JSON with it:
The .send(body
As we already know, JavaScript supports the JSON.parse(str) method to read JSON-encoded values.… in the JSON methods, toJSON chapter.… If json is malformed, JSON.parse generates an error, so the script “dies”.… Throwing our own errors.What if json is syntactically correct, but doesn’t have a required name property… Here it gets an unexpected error, but still shows the same "JSON Error" message.
Or, maybe, everything is all right with the site, but the response is not valid JSON.… But if any of the promises above rejects (a network problem or invalid json or whatever), then it would
It responds with a JSON of 30 commits, and also provides a link to the next page in the Link header.… The commits are returned in JSON format.
returned from fetch also includes the method response.json() that reads the remote data and parses it as JSON
website, e.g. another.com intended to expose data for this kind of access, then a so-called “JSONP (JSON