# Run Node.js Test Suites and Triage Failures with Atlas in 2026 > Atlas empowers Node.js developers to quickly identify and prioritize distinct root causes from extensive `node:test` failure logs. In 2026, Atlas helps Node.js developers transform overwhelming `node:test` output into a clear, prioritized list of distinct root causes, integrating directly with your `npm` workflows to streamline debugging and ensure fixes are tracked efficiently. Atlas provides the tools to run your suite, capture full logs, group failures, and manage fixes with confidence. ## Key takeaways - Atlas captures full `node:test` output, even beyond 2000 lines, for comprehensive Node.js test analysis. - Prioritize Node.js fixes by grouping failures by distinct root cause using `grep`, not individual test names. - Track every distinct Node.js issue with `todowrite` to prevent forgotten fixes and maintain accountability. - Atlas's `edit` tool provides unified diffs and permission checks for safe, controlled Node.js code changes. - Leverage `npm` and `node:test` directly within Atlas for a native and efficient Node.js development workflow. ## How to Run Node.js Tests with Atlas and Capture Full Output Running your Node.js test suite with Atlas ensures you capture the complete output, even for large projects producing over 2000 lines of logs. Atlas's `bash` tool executes your `npm test` command, retaining the full log for comprehensive analysis, preventing truncation that could hide critical details from your `node:test` results. When your Node.js project's `node:test` suite generates extensive output, the terminal can often truncate critical information. Atlas addresses this by using its `bash` tool to execute your `npm test` script, capturing the entire log. Even if the output exceeds 2000 lines or 50 KB, Atlas writes the complete log to a retained file and provides you with its path. This ensures that you always have access to the full context of your Node.js test failures, allowing for thorough investigation without missing any details. For example, you might run `atlas bash "npm test --timeout=60000"` to execute your suite with a generous 60-second timeout, ensuring slow tests are not prematurely killed. ## Analyzing Node.js Test Failures for Distinct Root Causes After running your Node.js tests, Atlas helps you move beyond individual test names to identify distinct root causes, a crucial step for efficient triage in 2026. Instead of sifting through hundreds of lines, Atlas's `grep` tool allows you to search the complete, saved log file for common error patterns, grouping failures effectively across your `node:test` output. The goal of triaging Node.js test failures is to identify the underlying problems, not just individual failing tests. Atlas facilitates this by allowing you to `grep` over the complete log file saved from your `npm test` run. Instead of focusing on specific test names, you can search for common error messages, stack trace patterns, or specific module names that appear repeatedly. For instance, after using `atlas read ` to view the full log, you might run `atlas grep "TypeError: Cannot read properties of undefined" ` to find all occurrences of a common JavaScript runtime error. This approach helps you group related failures, revealing a single root cause that might be responsible for dozens of individual test failures in your Node.js application. ## Tracking Node.js Fixes with Atlas's `todowrite` To ensure no Node.js test failure is forgotten, Atlas allows you to record each distinct root cause as a `todowrite` entry, maintaining a clear, actionable list. This structured approach, vital for complex Node.js projects, ensures that every identified issue from your `node:test` suite is tracked with a 'pending' status until resolved, improving team accountability in 2026. Once you've identified a distinct root cause for a set of Node.js test failures, it's essential to track its resolution. Atlas's `todowrite` tool lets you create a persistent record for each unique problem. Instead of relying on memory or external notes, you can add an entry like `atlas todowrite add "Fix unhandled promise rejection in user service due to missing await" --status pending`. This creates a 'pending' task that remains visible until you explicitly mark it as complete. This ensures that every identified issue, from a `package.json` configuration error to a complex `node:test` assertion failure, is systematically addressed and not overlooked in your Node.js development workflow. ## Iterative Fixing and Review for Node.js Code with Atlas Fixing Node.js test failures with Atlas is an iterative, controlled process, ensuring every change is reviewed before it impacts your codebase. Atlas's `edit` tool allows you to modify files, while its plan agent drafts a strategy and presents a unified diff for approval, providing a robust safety net for your `package.js` and source files in 2026. Atlas provides a secure and transparent way to implement fixes for your Node.js codebase. When you use `atlas edit src/utils/data.js` to modify a file, Atlas doesn't immediately write changes. Instead, it first drafts a plan in a read-only plan agent, then computes a unified diff for every proposed edit. This diff is surfaced for your approval, giving you full control over what changes are applied. All Atlas tool calls are permission-gated, requiring your explicit consent. After making a change, you can re-run only the affected `node:test` files using `atlas bash "node --test src/utils/data.js"` to quickly verify the fix. Atlas also snapshots file changes as git patches, allowing for easy rollback, and can stage and create commits on your behalf, integrating direct with your existing Node.js development practices. ## Steps 1. 1: Run your Node.js test suite with a generous timeout using Atlas's `bash` tool: `atlas bash "npm test --timeout=60000"`. 2. 2: If the output was truncated, read the complete log file path provided by Atlas using `atlas read `. 3. 3: Group Node.js test failures by distinct root cause using `atlas grep "Error message pattern" ` on the full log. 4. 4: Record each distinct root cause as a pending task using `atlas todowrite add "Fix specific Node.js error in module X" --status pending`. 5. 5: Edit the affected Node.js source file, for example: `atlas edit src/services/api.js`. 6. 6: Review the unified diff presented by Atlas for your proposed changes to the Node.js file and approve them. 7. 7: Re-run only the affected `node:test` files to verify your fix: `atlas bash "node --test src/services/api.js"`. 8. 8: Mark the `todowrite` entry as complete once the Node.js issue is resolved and verified: `atlas todowrite complete `. ## FAQ ### How does Atlas handle large Node.js test outputs? Atlas's `bash` tool captures the complete output of your `npm test` command, saving it to a file even if it exceeds 2000 lines or 50 KB. You can then use `atlas read` to view the full log, ensuring no critical Node.js test failure details are lost due to truncation. ### Can Atlas help me find specific errors in my Node.js test logs? Yes, after running your `node:test` suite, use `atlas grep "Error message pattern"` on the saved full log file to quickly filter and identify specific error types or stack traces relevant to your Node.js application. This helps in grouping failures by their underlying cause. ### What Node.js tools does Atlas integrate with for testing and development? Atlas integrates directly with the standard Node.js toolchain, including the `node:test` runner and `npm` for script execution and package management. It also understands `package.json` for module and script definitions, and can work with formatters like `prettier`. ### How does Atlas ensure I don't accidentally break my Node.js codebase? Atlas employs several safety mechanisms: a read-only plan agent, permission-gated tool calls, and presenting a unified diff for every proposed file edit for your explicit approval. This ensures all changes to your Node.js files are intentional and reviewed before being written. ### Can Atlas help me track the fixes for my Node.js test failures? Absolutely. With `atlas todowrite`, you can create entries for each distinct root cause identified in your `node:test` output, setting their status to 'pending'. This allows you to systematically track and manage the resolution of all identified Node.js issues. ### Does Atlas support local Node.js development environments and git workflows? Yes, Atlas builds its code index locally using Ollama embeddings, keeping your Node.js code off third-party servers. It also reads `git` branches, status, and diffs, and can stage and create commits on your behalf, integrating direct with your local Node.js development and version control workflow. --- Canonical HTML: https://runatlas.sh/resources/stacks/run-the-test-suite-and-triage-failures-in-nodejs Source of truth: aeo_pages row `/resources/stacks/run-the-test-suite-and-triage-failures-in-nodejs` (segment: Stacks) (this file is generated from it, never hand-edited). Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.