onDevTools JSON Formatter

Spec sheet

Purpose

Formats, validates, queries, diffs, and transforms JSON in the browser.Read 7 Oct 2026 · ondevtools.com

Privacy

The maker says parsing, validation, schema checks, diffing, and transforms run locally in the browser and JSON is not uploaded.Read 7 Oct 2026 · ondevtools.com

Maker

The About page identifies Onur Kat as an SAP Certified SAP Commerce Developer and DevOps Engineer.Read 7 Oct 2026 · ondevtools.com

Diff

Compares JSON documents side by side and can produce a JSON Merge Patch.Read 7 Oct 2026 · ondevtools.com

Formatting

Pretty-prints or minifies JSON with 2-, 4-, or 8-space indentation and optional alphabetical key sorting.Read 7 Oct 2026 · ondevtools.com

Intended audience

The maker presents onDevTools as a toolkit for developers and says the JSON tool can handle API responses, configuration files, and production payloads in the browser.Read 7 Oct 2026 · ondevtools.com

JSON modes

Supports strict RFC 8259 / ECMA-404 parsing and JSONC comments and trailing commas; JSON5 is not supported.Read 7 Oct 2026 · ondevtools.com

JSONPath

Provides an RFC 9535 JSONPath query engine with wildcards, recursive descent, slices, and filters.Read 7 Oct 2026 · ondevtools.com

Large input limit

The maker says the tree view and JSONPath become noticeably slower above about 1 MB or 50,000 nodes; streaming and JSON Lines are out of scope.Read 7 Oct 2026 · ondevtools.com

Number precision

Numbers larger than 2^53 − 1 can lose precision because the parser uses IEEE-754 doubles; the maker recommends representing 64-bit IDs as strings.Read 7 Oct 2026 · ondevtools.com

Schema validation

Validates against JSON Schema Draft 2020-12 and reports violations with JSON Pointer paths.Read 7 Oct 2026 · ondevtools.com

Transforms

Can flatten and unflatten JSON, remove nulls or empty values, and minify output.Read 7 Oct 2026 · ondevtools.com

Tree navigation

The collapsible tree view supports full-text search and copying a node's value or JSON Pointer path.Read 7 Oct 2026 · ondevtools.com

Plans and prices

Every onDevTools JSON Formatter plan and price →

Where Specifiction places it

• JSON Tools#27 of 297.0