Fix invalid JSON in documentation code examples

[SurefireStudios]

Why:

Closes:

No existing issue — this is a technical correction found by parsing every fenced json block in content/.

Six json code blocks across five articles are not valid JSON. Each is a one-character fix: one missing comma and five trailing commas.

Two of them are tagged json copy, so the site renders a copy button on a sample that will not parse where the reader pastes it:

• Customize containers used by jobs — the prepare_job example is missing the comma after "image": "node:18". Line 295 of the same file has the comma in the equivalent spot, so this is a typo rather than a house style.
• About Copilot hooks — trailing comma after the sessionStart array, in the block that introduces the hook configuration format.

The other three are trailing commas, which JSON does not permit:

• Evaluate expressions in workflows and actions — the vegetables object and the filter-result array beneath it.
• Publish Node.js packages — after the repository object. A package.json copied as printed is rejected by npm with JSONError: Unexpected token }.
• GitHub event types — after the org object in the example response.

The last one is under content/rest/, but it's a hand-written guide rather than the generated REST reference, so it isn't covered by the "we cannot accept contributions to the REST API reference documentation" rule. Happy to drop it from this PR if you'd rather keep content/rest/ changes separate.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Nine lines, all commas. No prose, structure, or sample values were touched.

File	Fix
actions/how-tos/manage-runners/self-hosted-runners/customize-containers.md	Add missing comma after "image": "node:18"
copilot/concepts/agents/hooks.md	Remove trailing comma after sessionStart array
actions/reference/workflows-and-actions/expressions.md	Remove 4 trailing commas
actions/tutorials/publish-packages/publish-nodejs-packages.md	Remove trailing comma after repository
rest/using-the-rest-api/github-event-types.md	Remove trailing comma after org

The customize-containers.md one, as an example:

       "jobContainer": {
-        "image": "node:18"
+        "image": "node:18",
         "workingDirectory": "/__w/octocat-test2/octocat-test2",

How this was found and checked. I extracted every fenced ```json block under content/ and ran it through a JSON parser, before and after. These five files go from six failing blocks to zero, and no other block changes state.

Blocks that are meant to be invalid were deliberately left alone — the "common validation errors when creating issue forms" examples, the newline-delimited JSON in copilot-usage-metrics/team-level-metrics.md, the /* hook entries */ placeholder in hooks-reference.md, and the parse-error demonstrations in workflow-syntax.md.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.

  Accuracy here is machine-checkable rather than a judgement call: each block either parses as JSON or it doesn't, and no documented value or key was changed. That said, please do sanity-check that none of the six was intentionally invalid — I believe none were, but you know the content better than a parser does.

• The changes in this PR meet the docs fundamentals that are required for all content.

• All CI checks are passing and the changes look good in the review environment.

  Confirmed after opening: 44 checks passing, 7 skipped (the maintainer-only workflows), none failing — content-linter included.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[github-actions]

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/how-tos/manage-runners/self-hosted-runners/customize-containers.md	fpt ghec	fpt ghec
actions/reference/workflows-and-actions/expressions.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17
actions/tutorials/publish-packages/publish-nodejs-packages.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17
copilot/concepts/agents/hooks.md	fpt ghec	fpt ghec
rest/using-the-rest-api/github-event-types.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[janiceilene]

👋 @SurefireStudios Thanks for opening a PR! I'll get this triaged for the team to review.

[mchammer01]

@SurefireStudios👋🏻 - Thanks for spotting and fixing these invalid JSON examples. The changes are clear, accurate, and nicely scoped. I’ve checked the updated examples and all six now parse correctly. Thanks for contributing 💖

[github-actions]

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