- Notifications
You must be signed in to change notification settings - Fork3.9k
Added examples of typical errors in JSON#3564
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to ourterms of service andprivacy statement. We’ll occasionally send you account related emails.
Already on GitHub?Sign in to your account
Open
Alexandre887 wants to merge2 commits intojavascript-tutorial:masterChoose a base branch
base:master
Could not load branches
Branch not found:{{ refName }}
Loading
Could not load tags
Nothing to show
Loading
Are you sure you want to change the base?
Some commits from the old base branch may be removed from the timeline, and old review comments may become outdated.
Open
Uh oh!
There was an error while loading.Please reload this page.
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
Sign up for freeto join this conversation on GitHub. Already have an account?Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Uh oh!
There was an error while loading.Please reload this page.
JSON methods, toJSON
let json = `{ *!*name*/!*: "John", // mistake: property name without quotes "surname": *!*'Smith'*/!*, // mistake: single quotes in value (must be double) *!*'isAdmin'*/!*: false, // mistake: single quotes in key (must be double) "birthday": *!*new Date(2000, 2, 3)*/!*, // mistake: no "new" is allowed, only bare values@@"gender": "male"*!* */!* // mistake: missing comma after non-last property @@@@"friends": [0,1,2,3]*!*,*/!* // mistake: there should not be a comma after the last property @@}`;In practice, many novice developers, following the rule that in JavaScript there can be a "trailing comma" in an object, try to reproduce the same in JSON. But a trailing comma in JSON makes it invalid. This is a very widespread stuff, so I think we should add such an example to "typical mistakes".
Also, many people forget that a comma should be aftereach property except the last one, which also causes JSON to become invalid. I also added such an example.