Data, configuration, and databases

Structured text and configuration

These formats are free. A text preview stops at the first 1 MB.

JSON is checked and formatted when the formatted result fits. JSON, YAML, TOML, and INI can switch among Source, Outline, and Mindmap.
JSONL and NDJSON stay line by line. They are not formatted as one JSON document.
XML, SQL, diff and patch, Protobuf, and GraphQL show source. Diff lines that start with + or − are colored.
Property lists, including .plist, .entitlements, .xcprivacy, .strings, and .stringsdict, show a short summary rather than the whole tree.
CSV and TSV show a delimited summary, not a spreadsheet. Finder may still use the system table preview for CSV.
.env and .env.* files show key names only. Values stay hidden. Finder often does not send these files to Peeka.

Use .sqlite, .sqlite3, .db, .db3, .s3db, or .sdb. Peeka opens the database read-only. It does not edit, repair, or migrate it.

The summary and table structure are free. Switch between Structure and Data, and choose a table from the list.
Pro adds record pages of up to 100 rows, and a preview of the first 4 KiB of a selected BLOB.
Views, and virtual or shadow tables, show structure only.
A file with no extension is not sent from Finder unless another type Peeka already handles covers that name.
Encrypted, damaged, or locked databases may not open. Selecting a WAL, SHM, or journal file by itself does not open a database.

Peeka 0.1.7 has passed Mac App Store review.

Added free native Diff/Patch previews with Source, Fluid, Change Blocks and Unified views, file switching, old/new line numbers, change counts and text copying.
Peeka only displays existing patch content. It does not compare arbitrary files or apply patches. Partial or unsupported input keeps its source and an explanation.