Save text

ComfyUI is great at forgetting strings. Your final prompt, the caption an LLM just wrote, the JSON you serialized - they live in widgets and die when the workflow closes. LF_SaveText is the boring, correct fix: it takes any text from your graph and writes it to disk as a .txt file, with a little tree widget that confirms the save and shows you the exact path.

It's from lf-nodes, the UX-first suite by lucafoscili. Where core ComfyUI gives you a Save Text that's minimal to the point of uselessness for archiving, this one wraps the write in the same path-handling machinery as the built-in Save Image node - timestamps, counters, subdirectories - so your outputs don't collide and don't bury themselves in the wrong folder.

How it works

Under the hood it's almost embarrassingly simple: normalize the text, resolve a file path, and write it with UTF-8 encoding. The polish is in the details. It uses ComfyUI's own get_save_image_path helper for filename resolution, so the filename_prefix conventions you already know from Save Image apply. When it finishes, it sends a small tree structure to a frontend widget - "TXT saved successfully!" with the full output path nested underneath - so you get visible confirmation instead of a silent side effect. The node also returns the text, which makes it a perfectly good "terminal" node in a plumbing-heavy graph: last in line, holds the value, writes the artifact.

The inputs that matter

• text (STRING) - whatever you're archiving. Prompts, LLM output, serialized JSON, a CSV of tags. If it's a string, it saves.
• filename_prefix (STRING) - path and filename. Use slashes to create subdirectories under ComfyUI/output; e.g. captions/batch1 lands in output/captions/batch1.txt. Empty uses the default folder.
• add_timestamp (BOOL, default true) - appends a date-time suffix so re-runs don't clobber each other.
• add_counter (BOOL, default true) - appends _1, _2, ... until it finds a free name. With both on, you can queue the same workflow a hundred times and keep every artifact.

Output is text (STRING), a pass-through of what you saved.

Install

Same pack for everything LF:

• ComfyUI Manager: search "LF Nodes", install, restart.
• Manual: cd ComfyUI/custom_nodes && git clone https://github.com/lucafoscili/lf-nodes.git, restart.

No models, no special downloads. The pack ships a long requirements.txt, but it's all auto-handled by Manager and mostly serves the filter/LLM/analytics nodes rather than this one.

Common issues

• The saved file isn't where you expected. Check ComfyUI/output first - the prefix is relative to the output root, and slashes in it create subfolders.
• You keep overwriting the same file. Leave add_timestamp and add_counter on, or give the prefix a unique name. Turning both off means a fixed filename that stomps on whatever's there - sometimes that's exactly what you want, but it's rarely a surprise you enjoy.
• Still on the archived repo. If you installed this pack before late 2025, you may be on the old comfyui-lf repo, which was archived and replaced by lucafoscili/lf-nodes. Reinstall from the current repo so you're not missing a year of fixes and new nodes.