Every question starts with the same document.

Format JSON locally with lossless large integers, configurable indentation, and deterministic key ordering.

Beautify compact or difficult JSON locally using the same lossless Rust engine as the formatter.

Remove insignificant JSON whitespace locally while preserving strings, values, ordering, and large integers.

Validate syntax, UTF-8, depth, duplicate keys, unsafe JavaScript integers, and optional JSON Schema rules.

Repair common malformed JSON from logs, humans, and LLMs—with each applied correction category listed before you use the result.

Explore JSON as a collapsible tree with paths, types, counts, search, and source-preserving local parsing.

Project arrays of JSON objects into a readable table with unioned columns and preserved nested values.

Search keys, values, or JSON Pointer paths with text or regular expressions entirely on device.

Run JSONPath expressions and a practical jq-style subset against a retained local document.

Try a focused jq-style selection subset in the browser using the same local Rust query engine.

See a payload as a node and edge graph, with array elements folded into one counted node.

Decode a protobuf payload from base64 or hex without its .proto, showing every field number, wire type, and plausible reading.

Translate between JSONPath and the jq subset, with a note wherever the two dialects genuinely disagree.

Compare JSON structurally with type changes, ignore rules, numeric tolerance, and array identity matching.

Merge two independently edited JSON documents against a shared base and surface same-path conflicts.

Generate, preview, apply, and reverse RFC 6902-style JSON Patch operations; apply Merge Patch locally too.

Compare a baseline and candidate payload and classify additive, warning, and breaking structural drift locally.

Record contract versions on this device and see how a payload's shape has drifted over time.

Infer JSON Schema 2020-12 types, required properties, array shapes, formats, unions, and optional enum candidates.

Validate a JSON document against a local JSON Schema with path-specific failures and no payload upload.

Generate deterministic JSON fixtures from local JSON Schema defaults, examples, enums, formats, properties, arrays, and local references.

Profile shapes, paths, key coverage, mixed types, nulls, cardinality, numeric ranges, size, and naming consistency.

Generate type declarations from JSON in twenty languages, from locally inferred nested types.

Generate a proto3 message definition from a JSON payload, with nested messages and numbered fields.

Turn a response into ready-to-paste blocks for Zod, tRPC, GraphQL, NestJS, Fastify, TanStack Query, and RTK Query.

Turn an example payload into an OpenAPI 3.1 document with an inferred schema, path parameters, and a response example.

Generate an example payload for every request body and response an OpenAPI document declares, resolving local references.

Run local pick, omit, rename, flatten, unflatten, sort, deduplicate, filter, map, reduce, group, select, and merge operations.

Detect common PII, credentials, private keys, tokens, and payment-card patterns, then mask, hash, remove, or replace selected paths.

Decode a JSON Web Token, inspect its claims, and verify HMAC signatures without the token leaving your device.