Fishjam JS Server SDK
software-mansion-labs/skills
Node.js / TypeScript server SDK for Fishjam — backends that create rooms, mint peer tokens, listen to server notifications, and run agents.
Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior.
Install Node Backend
$ npx skills add WrongStack/WrongStack --skill node-backend -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install WrongStack/WrongStack node-backend --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/WrongStack/WrongStack.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/core/skills/node-backend .claude/skills/node-backend && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "node-backend" agent skill from https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backend into .claude/skills/node-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "node-backend", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backendType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add WrongStack/WrongStack --skill node-backend -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install WrongStack/WrongStack node-backend --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/WrongStack/WrongStack.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/core/skills/node-backend .agents/skills/node-backend && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "node-backend" agent skill from https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backend into .agents/skills/node-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "node-backend", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add WrongStack/WrongStack --skill node-backend -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install WrongStack/WrongStack node-backend --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/WrongStack/WrongStack.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/core/skills/node-backend .cursor/skills/node-backend && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "node-backend" agent skill from https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backend into .cursor/skills/node-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "node-backend", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/WrongStack/WrongStack.git --path packages/core/skills/node-backend--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add WrongStack/WrongStack --skill node-backend -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install WrongStack/WrongStack node-backend --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/WrongStack/WrongStack.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/core/skills/node-backend .gemini/skills/node-backend && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "node-backend" agent skill from https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backend into .gemini/skills/node-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "node-backend", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install WrongStack/WrongStack node-backendInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add WrongStack/WrongStack --skill node-backend -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/WrongStack/WrongStack.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/core/skills/node-backend .github/skills/node-backend && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "node-backend" agent skill from https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backend into .github/skills/node-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "node-backend", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add WrongStack/WrongStack --skill node-backend -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install WrongStack/WrongStack node-backend --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/WrongStack/WrongStack.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/core/skills/node-backend .opencode/skills/node-backend && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "node-backend" agent skill from https://github.com/WrongStack/WrongStack/tree/main/packages/core/skills/node-backend into .opencode/skills/node-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "node-backend", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
node-backend- GitHub stars
- 371
- Token cost
- ~829 tokens
- SKILL.md length
- 285 words
- Files
- 1
- Skills in repo
- 100
- Repo updated
- First seen
- Licence
- MIT
At a glance
Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior.
- Works in 6 steps: Inspect framework lifecycle,… → Validate input and serialize public… → Bound request bodies, external calls and… → …
- Implementing Hono
- SKILL.md covers Selection card, Overview, Rules and Workflow, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Node Backend is an agent skill from WrongStack/WrongStack. Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior. Use when implementing Hono, Fastify, NestJS or another established Node server; use node-modern for runtime I/O details and preserve the chosen framework.
Its SKILL.md is about 830 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Backend & APIs, covering Backend development. It works with Fastify, Hono, NestJS and Node.js. The repository describes itself as: An AI coding agent that reads your code, edits files, runs commands, and reasons through bugs — across a terminal REPL, a full-screen TUI, and a browser UI, while you keep your… The licence is MIT.
When your agent uses it
- Implementing Hono
- Another established Node server
- Use node-modern for runtime I/O details and preserve the chosen framework
Example prompts
- “/node-backend”
Requirements
- Node.js
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Inspect framework lifecycle, plugin/dependency injection order and actual runtime adapter.
- Validate input and serialize public output at the route boundary; do not expose database rows or internal exceptions wholesale.
- Bound request bodies, external calls and expensive work according to application limits.
- Keep per-request auth/context isolated and authorize each operation/object.
- Make startup, readiness and graceful shutdown include owned pools/listeners/jobs.
- Verify framework error/cancellation semantics; returning an error-shaped object may still produce a success response.
What it can do on your machine
Read from SKILL.md and the folder at commit a744bdc. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
hono.devfastify.devdocs.nestjs.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Node Backend loads about 829 tokens when it runs. Until then it costs about 69 tokens; SKILL.md has 285 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from WrongStack/WrongStack at commit a744bdc, republished under its MIT licence (© WrongStack). 285 words, ~829 tokens.
Download SKILL.mdSave it as
.claude/skills/node-backend/SKILL.md (or your agent's skills folder).- name
- node-backend
- description
- Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior. Use when implementing Hono, Fastify, NestJS or another established Node server; use node-modern for runtime I/O details and preserve the chosen framework.
- trigger
- Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior. Use when implementing Hono, Fastify, NestJS or…
- version
- 1.0.1
- required-capabilities
- filesystem.read
- optional-capabilities
- filesystem.write, execution.shell, verification.run, web.research
- metadata.routing-group
- backend
- metadata.domain
- backend
Node Backend
Selection card
- Task: Implement Node server endpoints and shutdown. / TR: Node sunucu endpoint ve kapanış uygula.
- Start: Locate the endpoint, schema, authentication boundary and caller.
- Finish: apply the acceptance checks below; report observed results and unresolved constraints.
Overview
Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior.
Checked 2026-10-09: Hono 4.13.13, Fastify 5.12.5 and NestJS 12.1.2. Latest stable Node target is 26.11.1; verify framework/plugins/adapter requirements together.
Rules
- Inspect framework lifecycle, plugin/dependency injection order and actual runtime adapter.
- Validate input and serialize public output at the route boundary; do not expose database rows or internal exceptions wholesale.
- Bound request bodies, external calls and expensive work according to application limits.
- Keep per-request auth/context isolated and authorize each operation/object.
- Make startup, readiness and graceful shutdown include owned pools/listeners/jobs.
- Verify framework error/cancellation semantics; returning an error-shaped object may still produce a success response.
Workflow
- Trace route → service → persistence/external operation and existing conventions.
- Resolve latest stable targets and supported plugins before migration.
- Implement the feature with explicit contracts and lifecycle cleanup.
- Test valid/invalid/unauthorized input, dependency failure and stop/restart.
- Run configured type/lint/tests and a production server health/user-path check.
Before returning
Route/auth/output contracts verified; startup/shutdown resources owned; framework compatibility and actual server behavior recorded.
Sources
Versioned facts checked 2026-10-09; refresh authoritative sources before new installs/upgrades. Hono, Fastify, NestJS.
Skills in scope
- node-modern — node modern contracts and verification.
- api-design — api design contracts and verification.
- database-development — implement database access, models and queries with explicit consistency, transactions and bounded results.
- authentication-sessions — implement application sign-in, sessions and identity integration with explicit account/tenant authorization.
- queues-jobs — implement reliable asynchronous jobs and message consumers with explicit delivery, retry and shutdown semantics.
© WrongStack, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in packages/core/skills/node-backend of WrongStack/WrongStack.
Open the folder on GitHubat commit a744bdc
Compare with similar skills
Node Backend next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Node Backend this skillWrongStack/WrongStack | 371 | — | ~829 | Automated safety check: Pass | MIT | |
| Fishjam JS Server SDKsoftware-mansion-labs/skills | 291 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Nodejs Backend Patternsever-works/ever-works | 162 | 18 repos | ~4k | Automated safety check: Pass | AGPL-3.0 | |
| Senior Backendalirezarezvani/claude-skills | 28k | 1 repos | ~3.8k | Automated safety check: Pass | MIT | |
| API Designericrisco/rsc-harness | 180 | — | ~3.1k | Automated safety check: Pass | MIT | |
| Nodejs Backendalinaqi/maggy | 707 | — | ~1.8k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Node Backend
What does Node Backend do?
Build and upgrade Node.js HTTP services with typed validation, lifecycle ownership and production behavior. Node Backend is an agent skill from WrongStack/WrongStack.js HTTP services with typed validation, lifecycle ownership and production behavior.
When should I use Node Backend?
Node Backend fits situations like: implementing Hono; another established Node server; use node-modern for runtime I/O details and preserve the chosen framework.
How do I install Node Backend in Claude Code?
Run `npx skills add WrongStack/WrongStack --skill node-backend -a claude-code`. Or copy the skill folder (packages/core/skills/node-backend in WrongStack/WrongStack) into .claude/skills/node-backend in your project. Claude Code loads it when a task matches its description.
How do I install Node Backend in Codex?
Run `npx skills add WrongStack/WrongStack --skill node-backend -a codex`. Or copy the skill folder (packages/core/skills/node-backend in WrongStack/WrongStack) into .agents/skills/node-backend in your project. Codex loads it when a task matches its description.
Can I use Node Backend in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add WrongStack/WrongStack --skill node-backend -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/node-backend, .gemini/skills/node-backend, .github/skills/node-backend and .opencode/skills/node-backend in your project.
What does Node Backend need to run?
SKILL.md names no scripts, command-line tools or credentials: Node Backend is instructions for the agent only. Our summary lists: Node.js.
Does Node Backend access the network?
SKILL.md names 3 domains. As links in the text: hono.dev, fastify.dev and docs.nestjs.com. This is read from the text; nothing was executed.
Is Node Backend safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Node Backend use?
Node Backend is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Node Backend use?
About 829 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Node Backend?
Skills that share tags, products or a category with Node Backend: Fishjam JS Server SDK (software-mansion-labs/skills, 291 stars), Nodejs Backend Patterns (ever-works/ever-works, 162 stars), Senior Backend (alirezarezvani/claude-skills, 28k stars) and API Design (ericrisco/rsc-harness, 180 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Node Backend?
WrongStack (a GitHub organization) maintains it in WrongStack/WrongStack, which has 371 GitHub stars. The repository holds 100 skills in this directory. The repository was last updated on October 10, 2026.
Source: WrongStack/WrongStack on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.