jsonshim

org.toolkitlabsPublished by toolkitlabs.orgv1.0.2Updated Oct 27, 2026

Recovers malformed LLM JSON. MCP build: 218/300 on MALFORMED-300 (library build 282/300).

VerifiedSTDIODesktop onlyDeveloper ToolsAI & ML

Overview

AI-generated overview

Local MCP server that repairs malformed JSON output from language models, exposing the jsonshim recovery library to an assistant.

What you can do
  • Repairs malformed JSON produced by LLMs so it can be parsed.
  • The registry lists no individual tools, so the exact operations are not documented; the server is described as an MCP build of the jsonshim library.
  • Reported accuracy is 218/300 on the MALFORMED-300 benchmark, versus 282/300 for the library build.
When to use it
Worth adding when an assistant or pipeline frequently receives broken JSON from model output and needs a local repair step before parsing. The lower benchmark score than the library build suggests checking whether the library itself would serve better.
Requirements
Runs as a local process over stdio, installed from the npm package jsonshim-mcp, so Node.js and a desktop environment are needed. No authentication, environment variables or headers are declared.
Before you install
Repairing malformed JSON can silently change or drop content, so verify recovered output before relying on it. The registry reports a lower success rate than the underlying library build, and no tool list or documentation is provided to confirm behavior.

Installation

In SourceWeft

  1. Open jsonshim in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.2LatestSep 16, 2026

Score

25% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • License10 pts

    Declare a license in the repository or the registry entry.