v1.0.0 Native JSON workbench

The JSON workbench.

Q: How large a file can it open?

Any size — hundreds of MB, multiple GB. At ≥ 10 MB, lazy zero-copy slicing (via sonic-rs) opens the file without parsing the whole tree, and the UI only fetches what's on screen — so there's no cap on opening or viewing. Only whole-document edit, export and validation materialize the root (a ~200 MB ceiling).

Q: Which formats can I import and export?

Import and auto-detect JSON, YAML, XML, CSV and cURL, or fetch from a URL. Export documents as JSON, JSON-min, YAML, CSV or XML, and graph images as PNG, JPEG or SVG. (CSV export needs a root array of objects.)

Q: Can it generate types from my JSON?

Yes — nine targets: TypeScript, Rust, Go, Kotlin, Python, PHP, Java, Zod and JSON Schema (2020-12). Optional fields are inferred from the data; generation is deliberately not configurable.

Q: Is it really free?

Yes. Pandia is free and open source under Apache-2.0. There are no paid tiers and no plans for any. The source lives at github.com/hendurhance/pandia.

Open any JSON instantly — even a multi-gigabyte file. See it five ways, generate types for nine languages, compare, repair, and export — all in one fast, native, offline app. Free and open source.

Download for macOS · Free View source

Apache-2.0 macOS · Windows · Linux Offline & private

users-2026-05.json

schema.json

Compare ⌘D

Export ⌘E

Outline

Schema

Types

History

▾[ root ] 109,472

▸0 5

▸1 5

▾2 5

name

verified

▸3 5

▸4 5

Tree Expand · Collapse · Search

▾[[ 109,472 items ]

▸0: 5 props

▸1: 5 props

▾2:

name:"Carmen Herzog"

email:"c.herzog@ebert.biz"

verified:true

followers:12846

deletedAt:null

▸3: 5 props

▸4: 5 props

109,467 more — virtualized

Code CodeMirror · fold gutter

1▾[

2▸ … 5 keys … ,

3▾

4 "name": "Carmen Herzog",

5 "email": "c.herzog@ebert.biz",

6 "verified": true,

7 "followers": 12846,

8 "deletedAt": null

9 ,

10▸ … 5 keys …

Path$[2].name

Typestring

Size1.2 GB

JSON valid

⌘K Commands

Open sourceApache-2.0 license

3 platformsmacOS · Windows · Linux

GB+Opens multi-GB with no lag

OfflineData never leaves your machine

Five views

One document, five ways to read it.

The same JSON as a tree, raw code, a spreadsheet, a node graph, or a diff — switch instantly with ⌘1–⌘4. The product window stays exactly as it ships.

Tree ⌘1

Code ⌘2

Grid ⌘3

Graph ⌘4

Compare ⌘D

Tree ⌘1 Code ⌘2 Grid ⌘3 Graph ⌘4 indent guides · drag-reorder

▾

id:4821

name:"Carmen Herzog"

▾roles:[ 2 items ]

0:"admin"

1:"editor"

▾profile:

verified:true

followers:12846

website:"herzog.dev"

deletedAt:null

Tree ⌘1 Code ⌘2 Grid ⌘3 Graph ⌘4 CodeMirror 6 · line + fold gutters

1▾

2 "id": 4821,

3 "name": "Carmen Herzog",

4▾ "roles": ["admin", "editor"],

5▾ "profile":

6 "verified": true,

7 "followers": 12846

8 ,

9 "deletedAt": null

Code (CodeMirror) view of JSON in Pandia

Tree ⌘1 Code ⌘2 Grid ⌘3 Graph ⌘4 sortable · per-column filter

#	id ↓	name	email	verified	followers nullable
0	4821	Carmen Herzog	c.herzog@ebert.biz	true	12846
1	4822	Anna Reuter	anna@reuter.io	true	8190
2	4823	Jadon Wiza	jadon.w@kihn.com	true	23117
3	4824	Clair Emard	clair@emard.net	true	null
4	4825	Leon Bartell	leon.b@hane.org	true	6402
5	4826	Mara Okuneva	mara@okuneva.co	true	19553

Grid (spreadsheet) view of JSON in Pandia

Tree ⌘1 Code ⌘2 Grid ⌘3 Graph ⌘4 left → right · export PNG / JPEG / SVG

root

id4821

name"Carmen…"

roles [2]

0"admin"

1"editor"

profile

verifiedtrue

followers12846

tags [3]

0"pro"

links

web"herzog…"

Fit100%Expand allExport ⌄

Graph (node diagram) view of JSON in Pandia

Compare ⌘D Side-by-side Tree Inline sync-scroll · Prev / Next

+3 added−2 removed~2 changed↔1 moved

users-2026-04.json base

"name": "Carmen Herzog",

~ "followers": 11030,

− "legacy": true,

− "plan": "trial",

"verified": true

users-2026-05.json current

"name": "Carmen Herzog",

~ "followers": 12846,

+ "verified": true,

+ "website": "herzog.dev",

+ "deletedAt": null

Compare / diff view of two JSON documents in Pandia

Default = Tree. Square corners, 1px hairlines, uncolored keys, the one orange cursor — the product shot is the app, not a render of it.

Capabilities

A workbench, not a viewer.

Everything you reach for when JSON gets real — import, generate, compare, repair, validate. Pick one to see it in action.

Bring it in

Shape it

Check & ship

Paste · auto-detect

$ curl https://api.acme.dev/v2/users -H "Auth: ***"

✓ Detected cURL — converting to JSON…

2 "users": [ … 109,472 ],

3 "page": 1,

4 "total": 109472

Paste · drop · open · fetch URL — JSON, YAML, XML, CSV, cURL.

Repair malformed JSON

2 name: 'Carmen',unquoted key · single quotes

3 "followers": 12846,trailing comma

↳ repaired

2 "name": "Carmen",

3 "followers": 12846

Generated · from 109,472 records TS Rust Go Zod

1interface User

2 id: number;

3 name: string;

4 verified: boolean;

5 followers: number | null;

6 deletedAt: string | null;

type Users = User[];

1#[derive(Serialize, Deserialize)]

2pub struct User

3 pub id: i64,

4 pub name: String,

5 pub verified: bool,

6 pub followers: Option<i64>,

1type User struct

2 ID int64 `json:"id"`

3 Name string `json:"name"`

4 Verified bool `json:"verified"`

5 Followers *int64 `json:"followers"`

1const User = z.object(

2 id: z.number(),

3 name: z.string(),

4 verified: z.boolean(),

5 followers: z.number().nullable(),

6);

Optional fields inferred · not configurable by design ⎘ Copy

Compare · users-04 ↔ users-05+1~1−1

"name": "Carmen Herzog",

~ "followers": 12846,

+ "verified": true,

+ "website": "herzog.dev",

− "legacy": true

Side-by-side · tree · inline — added, removed, changed & moved.

Validate · JSON Schema 2020-12

1 "age": "31", "email": "x@", "role": "owner"

✗/age expected integer, got string

✗/email must match format "email"

✗/role not one of [admin, editor, viewer]

3 errors · click to jump to the offending node.

ExportYAMLJSONCSVXML

1users:

2 - id: 4821

3 name: Carmen Herzog

4 verified: true

5total: 109472

JSON · JSON-min · YAML · CSV · XML — copy or save to file.

How it works

Open it. See it. Shape it. Ship it.

Four steps, no ceremony between them. From a file on disk to clean output, in one window.

01 OPEN

Open

Drag in a file, paste, or fetch a URL. It loads instantly — no spinner, no upload.

⇲ users-2026-05.json

✓ 1.2 GB · ready

02 SEE

Navigate

Tree, code, grid, graph — virtualized so it stays smooth. The status bar tracks your path.

$[2].name

→ "Carmen Herzog"

03 SHAPE

Transform

Edit, sort keys, repair, filter the grid, or generate types. Every change is reversible.

⌘Z undo · ⌘⇧Z redo

✓ 500-op history

04 SHIP

Export

Out to JSON, YAML, XML, CSV — or generated types for your codebase.

⌘E → User.ts

✓ copied to clipboard

Built for big

GB+

Most editors choke at a few hundred megabytes. Pandia opens files of any size — hundreds of MB, multiple GB — without parsing the whole tree: lazy zero-copy slicing engages at ≥ 10 MB (backed by sonic-rs) and the UI only ever fetches the slice on screen.

You scroll, search, and navigate instantly — there's no cap on opening or viewing. Only whole-document edit, export and validate materialize the root (a 200 MB ceiling).

Lazy mode≥ 10 MB zero-copy slicing engages

Openingany size multi-GB, no lag, no cap

200 MB caponly whole-doc edit / export / validate

Recoveryauto-save & backups, scan / restore

users-2026-05.json 1.2 GB · 109,472 records

Open instant

First paint virtualized

In memory lazy slice

Binary Rust + Tauri

Why Pandia

Native, private, and yours to keep.

No accounts, no cloud, no telemetry. A small native binary that respects your machine and your data.

◎

Offline & private

All processing is local. The only network call is a URL fetch you start yourself.

⌬

Native & fast

Built on Rust + Tauri 2. A small binary that starts instantly and stays out of the way.

▣

Cross-platform

One workbench for macOS, Windows and Linux — the same views, the same shortcuts.

◐

Make it yours

19 themes, density options, and 12+ code fonts. Light or dark, your way.

⎌

Forgiving

Per-tab undo / redo with exact inverses, plus crash recovery from auto-saved backups.

⌥

Free & open source

Apache-2.0. Read the code, file an issue, or build it yourself. No tiers, ever.

Questions

The honest answers.

No. Pandia is a native desktop app and everything is processed locally. The only time it touches the network is when you fetch a document from a URL. No accounts, no cloud, no telemetry.

Any size — hundreds of MB, multiple GB. At ≥ 10 MB, lazy zero-copy slicing (via sonic-rs) opens the file without parsing the whole tree, and the UI only fetches what's on screen — so there's no cap on opening or viewing. Only whole-document edit, export and validation materialize the root (a ~200 MB ceiling).

Import and auto-detect JSON, YAML, XML, CSV and cURL, or fetch from a URL. Export documents as JSON, JSON-min, YAML, CSV or XML, and graph images as PNG, JPEG or SVG. (CSV export needs a root array of objects.)

Yes — nine targets: TypeScript, Rust, Go, Kotlin, Python, PHP, Java, Zod and JSON Schema (2020-12). Optional fields are inferred from the data; generation is deliberately not configurable.

No. Pandia doesn't ship a query language. Instead you navigate the tree, run substring find & replace, and use the Grid's column filters (13 operators, OR-of-AND groups) and sorting to slice arrays of objects.

Yes. Pandia is free and open source under Apache-2.0. There are no paid tiers and no plans for any. The source lives at github.com/hendurhance/pandia.

Get Pandia

Stop fighting your JSON.

Download the native app, open your biggest file, and get to work. Free, offline, and open source.

Download for macOS · Free View source

Download for Windows Download for Linux v1.0.0 · Apache-2.0