POLPROG JSON Formatter

Spec sheet

Purpose

The browser-based tool formats, validates, inspects and compares JSON.Read 7 Oct 2026 · polprog.pl

Privacy

JSON processing runs locally in the browser and the page says pasted or dropped documents are never uploaded to POLPROG servers.Read 7 Oct 2026 · polprog.pl

Headquarters

Warsaw, PolandRead 28 Sep 2026 · polprog.pl

Maker

POLPROG describes itself as a Polish technology company founded by Damian Skrzyński and says it is based in Warsaw, Poland.Read 7 Oct 2026 · polprog.pl

Comparison

Its semantic diff ignores indentation, line endings and object key order, while comparing arrays as ordered sequences.Read 7 Oct 2026 · polprog.pl

Conversion

It can convert JSON to YAML, a TypeScript interface or CSV.Read 7 Oct 2026 · polprog.pl

File limit

Documents are capped at 5 MiB; syntax highlighting switches off above 300 KiB and detailed diff may stop early on very large trees.Read 7 Oct 2026 · polprog.pl

Formatting

It can format JSON with two spaces, four spaces or tabs, and can minify it.Read 7 Oct 2026 · polprog.pl

Intended use

The page describes use cases including reading API responses, checking webhook payloads, comparing configuration versions and turning sample responses into TypeScript interfaces.Read 7 Oct 2026 · polprog.pl

Local storage

The page says the only setting retained between visits is the selected indentation, and document content is not written to storage or the address bar.Read 7 Oct 2026 · polprog.pl

Requirements

The workspace runs in the browser and requires JavaScript.Read 7 Oct 2026 · polprog.pl

Scope limit

The tool does not validate JSON Schema or repair broken documents.Read 7 Oct 2026 · polprog.pl

Sorting

It can sort JSON keys A–Z or Z–A.Read 7 Oct 2026 · polprog.pl

Tree and search

The tool provides a tree view with copyable paths and values, plus search for keys or values.Read 7 Oct 2026 · polprog.pl

Validation

Validation reports the error line, column, character offset and cause, and can flag duplicate keys and large integers that lose precision in JavaScript.Read 7 Oct 2026 · polprog.pl

Plans and prices

Every POLPROG JSON Formatter plan and price →

Where Specifiction places it

• JSON Tools#26 of 297.1