The Terraform HCL Linter is a fast, private first pass over your configuration. It parses pasted .tf and reports the structural problems that cause terraform plan and terraform apply to fail: unbalanced braces, unclosed string literals, duplicate resource addresses and resource blocks that are missing their type or name labels. Running it before you commit saves a round trip through CI and catches the typos that are easy to miss by eye.
Every check runs locally in your browser, so your code never leaves the machine and nothing is uploaded to any server. The linter is not a replacement for terraform validate, which has the full provider schema, but it is the quickest way to confirm a file is at least syntactically sound. Use it while you write, after a merge, or as a teaching aid when someone is learning HCL and wants to see what well-formed configuration actually looks like.
The linter also helps teams enforce a baseline before code review. A quick paste catches the obvious mistakes so reviewers can focus on design rather than syntax. Because the report is plain Markdown, you can paste it directly into a pull request comment, and because the findings are also available as JSON you can wire the output into a custom gate or dashboard without screen scraping.
Common problems the linter catches include a missing closing brace after a long resource, a string that was opened but never closed because of a stray quote, and two modules that both declare a resource named default so the addresses collide. All three are easy to introduce during a large refactor and just as easy to overlook until terraform apply fails hours later.