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@FrederikBolding FrederikBolding commented Jan 15, 2026

Explanation

As-is the compatibility function deserializeError strips out valid data if it isn't an object. Serialized values based on the JsonRpcError class may have data that is any JSON value. This PR fixes the issue by adding an additional case to the deserialization to account for data being a non-object JSON value.

This for example ensures that "execution reverted" errors from the node have the revert data properly populated.

Checklist

  • I've updated the test suite for new or updated code as appropriate
  • I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
  • I've communicated my changes to consumers by updating changelogs for packages I've changed
  • I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

Note

Ensures deserializeError retains non-object JSON data for RPC errors while still merging cause appropriately.

  • Add deserializeData to merge object data with cause and pass through primitive/JSON data using isValidJson
  • Update deserializeError to use deserializeData; import OptionalDataWithOptionalCause and isValidJson
  • Extend tests to cover primitive data case and validated error message behavior
  • Update CHANGELOG.md under Unreleased with the fix

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@FrederikBolding FrederikBolding marked this pull request as ready for review January 15, 2026 14:15
@FrederikBolding FrederikBolding requested review from a team as code owners January 15, 2026 14:15
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LGTM!

@FrederikBolding FrederikBolding added this pull request to the merge queue Jan 15, 2026
Merged via the queue into main with commit 9659ac3 Jan 15, 2026
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@FrederikBolding FrederikBolding deleted the fb/ensure-non-object-data-is-deserialized branch January 15, 2026 14:49
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joaoloureirop pushed a commit to MetaMask/metamask-mobile that referenced this pull request Jan 16, 2026
… `^10.2.1` (#24759)

- chore: bump `@metamask/json-rpc-engine` to `^10.2.1` (#24589)

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## **Description**

[fix: Ensure non-object data in RPC errors is deserialized correctly
](MetaMask/core#7638)
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## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
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## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding

Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Minor dependency bump to keep JSON-RPC stack up-to-date.
> 
> - Upgrades `@metamask/json-rpc-engine` from `^10.2.0` to `^10.2.1` in
`package.json`
> - Updates `yarn.lock` to reflect the new version
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
61fe095. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->


[322fa9f](322fa9f)

Co-authored-by: cryptodev-2s <109512101+cryptodev-2s@users.noreply.github.com>
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3 participants