YAML Viewer Online
View and inspect YAML files directly in your browser. Browse rows, check column names and data types — no upload required, your data stays on your device.
About the YAML viewer
The YAML viewer parses a .yaml or .yml file in the browser and shows it as a table. It works best on YAML that holds records: a top-level list of mappings such as fixtures, inventories, seed data or catalogue files. Each list item becomes a row, each key becomes a column, and the schema panel shows the type detected for each key.
It is also a quick syntax check. If the file has a tab used for indentation, a missing space after a colon or a bad indent, parsing fails and the error message gives the line and column. The parser follows YAML 1.2, so NO and yes stay strings, while an unquoted 01234 becomes the number 1234. A file whose top level is a mapping, like most config files, shows as a single row. A file with several --- documents is shown as one table, with the records from every document. Anchors and aliases are expanded, so shared values appear in full on each row.
What to check when you open a YAML file
- The file parses at all. The error message points to the line and column of the first problem.
- Rows match your records. One row means the top level is a mapping, not a list.
- Codes with leading zeros such as 01234 still have them. Quote them in the YAML if not.
- Unquoted dates appear as text like 2026-03-02T00:00:00.000Z. Quote them if you want plain dates.
- Values from anchors and aliases are filled in on every record that uses them.
Your file is processed locally in your browser and is never uploaded. The free limit is 50 MB per file; larger files work if your device has the memory for them.
Frequently Asked Questions
Why does the YAML viewer show my config file as one row?
The file's top level is a mapping of settings, not a list of records, so it is treated as one record with many columns. Nested sections appear as JSON text in their cells. Use the YAML to JSON page to see config files with their nesting intact.
Can the viewer open multi-document YAML files?
Yes. Every --- section is read. A section holding a list adds each item as a row, and a section holding one mapping adds a single row.
Does the viewer show YAML comments?
No. Comments are removed when the YAML is parsed, and only the data values are shown. Open the file in a text editor to read the comments.
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