.gitignore Generator Guide: Stack Combos, Deduping, and Custom Rules

Why .gitignore exists

A Git repo should not carry build outputs, dependency trees, local secrets, or editor clutter. Missing ignore rules show up as:

• Bloated clones — node_modules/, target/, dist/ balloon checkout and CI time
• Noise conflicts — per-developer IDE/OS files thrash merges
• Secrets in history — deleting a committed .env from the working tree does not erase the past
• Status spam — real changes drown in junk paths

The .gitignore Generator lets you tick language, framework, IDE, tool, and OS templates. Merged output deduplicates identical rules and accepts extra custom lines. Generation stays in the browser — your repo paths never upload.

Syntax you actually need

Three traps

1. Already-tracked files ignore new rules. Run git rm --cached <path> (or a careful full-index reset), then commit.
2. Negation order matters. Broad ignore first, then !.env.example.
3. Empty directories are never tracked. Use .gitkeep and make sure it is not ignored.

One more habit: commit the .gitignore itself. A file that lives only on your laptop does not help the team — everyone reinvents conflicting rules.

How to pick templates in the tool

Five categories (filterable via search):

Example combos:

• Frontend: JavaScript/TypeScript + Next.js (or React) + VS Code + macOS
• Go API: Go + JetBrains + Docker + your OS
• Infra: language pack + Terraform (drops .terraform/ and *.tfstate)

When templates overlap (several node_modules/ lines), only the first occurrence is kept.

VS Code template: ignore private noise, keep shared config

The VS Code pack now follows the common community pattern: ignore .vscode/*, then negate settings.json, tasks.json, launch.json, extensions.json, and code snippets. Personal scratch stays out of the repo; shared workspace config can still be committed. If your team policy is "never commit .vscode", delete the negation lines after download.

Custom rules

Put project-only paths in the custom box—internal caches, private artifact names. Duplicates against templates are removed. The Env pack already includes a !.env.example style exception you can edit.

Scenarios: greenfield, team baseline, cleanup

New repo

Generate and commit .gitignore immediately after git init. Downloading the file to the repo root is enough.

Team baseline

Tick IDE + OS templates so fewer people commit .idea or .DS_Store. Keep personal ignores in a global excludes file:

git config --global core.excludesfile ~/.gitignore_global

Global excludes are for "only me" paths (machine-local secrets, personal notes). The repo .gitignore is the team contract.

Legacy repo that already tracked dependencies

1. Generate a complete file and commit it
2. git rm -r --cached . then git add . (backup and coordinate first)
3. Commit “stop tracking ignored paths”
4. If secrets were ever committed: rotate first, then rewrite history with something like git filter-repo

Before a blanket --cached reset, sample impact with git ls-files | rg 'node_modules|\.env$' so you know what will stop being tracked.

Pairing with Docker workflows

Containerized apps usually need both:

• .gitignore — keep secrets and local junk out of Git
• .dockerignore — keep the same class of files out of the build context

Use the .gitignore Generator for Git and the .dockerignore tab on the Dockerfile tool for builds. Overlap (.env, node_modules) is expected; maintain them separately. When a historical docker run should become Compose YAML, use docker run to Compose.

Should lockfiles be ignored?

Rust/PHP templates intentionally keep application lockfiles so reproducible installs are not deleted by default. Library authors who omit locks can add one custom line — do not bend the language template for the minority case.

Quick verification that rules do what you meant

After generating or hand-editing:

git check-ignore -v path/to/file
git status --ignored
git ls-files --others --exclude-standard

check-ignore -v names the exact rule line that matched — far faster than eyeballing negation order.

Monorepos and generated folders

In a monorepo, a single root .gitignore usually still wins: language templates at the top, then framework packs for each app (nextjs, django, …), then one OS + IDE pair. Nested ignores are useful when a package intentionally tracks something the root ignores (or the reverse). Prefer documenting that exception in the nested file with a one-line comment so the next person does not “fix” it by flattening everything back to root. Generated folders that change name per toolchain (.turbo/, .parcel-cache/, coverage/) belong in custom rules once — do not re-tick overlapping language templates hoping a duplicate line will appear; the generator will collapse them.

FAQ

I added a rule but git status still shows the file

It is already tracked. For one path: git rm --cached path, confirm the ignore works, then commit.

Can I nest another .gitignore in a subdirectory?

Yes—patterns are relative to that file. Teams usually prefer one root file; nested files suit unusual subprojects.

What if a secret was committed?

Treat it as leaked: rotate immediately, then scrub history. Adding .gitignore later is not enough.

Does dedupe remove comments I care about?

Deduping keys on identical non-comment rule lines. Section headers (# === Next.js ===) stay so you can still see which template contributed a block.

Triage notes

The three pitfalls are ranked by damage: "already-tracked files ignore new rules" is the number-one misconception (you need git rm --cached to untrack first); negations must go broad before narrow; and once a secret is committed, deleting the working-tree file erases nothing from history — hence the handling order for leaked secrets: rotate first, scrub history second, and adding a .gitignore line alone does not count as handling it. Of the three self-check commands, check-ignore -v is the most valuable: it names the exact rule line that matched, which beats eyeballing the file when debugging negation order. In the lockfile section, the generator deliberately does not ignore application-side lockfiles for Rust/PHP, stating the reason outright: avoid deleting reproducible builds by accident.

Provided by ToolVault. Related tools: .gitignore Generator, Dockerfile Generator, docker run to Compose. See the homepage for more developer tools.