# FeedBench

> Free CSV and JSON file checks in your browser. See exact values, preview a column mapping and compare two versions by key, with no account or upload.

Check a UTF-8 CSV or JSON file in your browser before you import it into another system. Confirm the CSV delimiter and header row, then see the rule, record and column of any syntax problem, with every value shown exactly, leading zeroes and edge spaces included. Read strict JSON with every number kept as written. Preview a new comma-separated file built from your columns, exact constants and exact lookups in a reference CSV, with every omitted column acknowledged and every changed value recorded. Compare a previous CSV by one to four key columns, or check whether two JSON files are exactly equal. Candidate local checks for FactoryCards, WorkSteps and KitProof CSV layouts are labelled as previews. Download a diagnostic PDF or CSV without your values, the mapped CSV preview, a reusable mapping recipe and a project backup. Keep work in temporary memory or save it on this device, and prepare the tool for offline use.

## Pages

- [FeedBench CSV and JSON file checker](https://feedbench.smartfact.ai/app/): Free CSV and JSON file checks in your browser. See exact values, preview a column mapping and compare two versions by key, with no account or upload.
- [Free CSV and JSON file checker](https://feedbench.smartfact.ai/): Free CSV and JSON file checks in your browser. See exact values, preview a column mapping and compare two versions by key, with no account or upload.
- [Free CSV import checker in your browser](https://feedbench.smartfact.ai/csv-import-checker/): Check a CSV file in your browser for delimiter, header, quote, column-count and UTF-8 problems. FeedBench shows the rule, record and column, with every value exactly as written.
- [Map CSV columns to an import layout](https://feedbench.smartfact.ai/csv-column-mapping/): Preview a CSV in another system's column layout: choose a source for each column, add exact constants and look up codes in a reference file. The original file stays untouched.
- [Compare two CSV files by key](https://feedbench.smartfact.ai/compare-csv-files/): Compare this week's CSV export with last week's by the key columns you choose. FeedBench reports added, removed, changed and ambiguous keys without guessing a match. Free, in your browser.
- [Your files stay on your device](https://feedbench.smartfact.ai/privacy/): How FeedBench keeps files in your browser, what each download contains and how optional analytics works.
- [Small tools for the factory floor](https://feedbench.smartfact.ai/about/): What FeedBench is and is not, the other free SmartFACT tools and how to get help.

## Discovery

- [Full text](https://feedbench.smartfact.ai/llms-full.txt)
- [Sitemap](https://feedbench.smartfact.ai/sitemap.xml)