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fix(github): handle invalid GitHub event payload JSON #2464

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fix(github): handle invalid GitHub event payload JSON #2464

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aceaa9d
Handle invalid GitHub event payload JSON
ghoullier Jul 31, 2026
3c8253a
Wrap context initialization in try-finally block
ghoullier Sep 16, 2026
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1 change: 1 addition & 0 deletions packages/github/__tests__/invalid-payload.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
{
18 changes: 18 additions & 0 deletions packages/github/__tests__/lib.test.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import * as path from 'path'
import {readFileSync} from 'fs'
import {EOL} from 'os'
import {Context} from '../src/context.js'

describe('@actions/context', () => {
Expand All @@ -25,6 +26,23 @@ describe('@actions/context', () => {
expect(context.payload).toEqual({})
})

it('returns an empty payload when the event payload is invalid JSON', () => {
process.env.GITHUB_EVENT_PATH = path.join(__dirname, 'invalid-payload.json')
const write = jest
.spyOn(process.stdout, 'write')
.mockImplementation(() => true)

try {
context = new Context()

expect(context.payload).toEqual({})
expect(write).toHaveBeenCalledWith(
`GITHUB_EVENT_PATH ${process.env.GITHUB_EVENT_PATH} contains invalid JSON${EOL}`
)
} finally {
write.mockRestore()
}

@ghoullier ghoullier Sep 23, 2026

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@copilot Fix the code for this review comment.

When a review comment includes a suggested change, apply the suggestion exactly.

Do not make changes beyond what is described in the linked review comment.


it('returns attributes from the GITHUB_REPOSITORY', () => {
expect(context.repo).toEqual({owner: 'actions', repo: 'toolkit'})
})
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17 changes: 14 additions & 3 deletions packages/github/src/context.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -30,9 +30,20 @@ export class Context {
this.payload = {}
if (process.env.GITHUB_EVENT_PATH) {
if (existsSync(process.env.GITHUB_EVENT_PATH)) {
this.payload = JSON.parse(
readFileSync(process.env.GITHUB_EVENT_PATH, {encoding: 'utf8'})
)
try {
this.payload = JSON.parse(
readFileSync(process.env.GITHUB_EVENT_PATH, {encoding: 'utf8'})
)
} catch (error) {
if (error instanceof SyntaxError) {
const path = process.env.GITHUB_EVENT_PATH
process.stdout.write(
`GITHUB_EVENT_PATH ${path} contains invalid JSON${EOL}`
)
} else {
throw error
}
}
} else {
const path = process.env.GITHUB_EVENT_PATH
process.stdout.write(`GITHUB_EVENT_PATH ${path} does not exist${EOL}`)
Expand Down