Format, validate and convert JSON in VS Code

Format and validate

• JSON / YAML / XML Formatter: format, minify, validate and convert between the three.
• JSON Schema Validator: every violation with its path, or a schema inferred from the JSON when you have none.
• Diff Checker: compare two texts, or two JSON documents structurally, so reordered keys are not reported as changes.
• JSON Lines Inspector: read .jsonl files record by record.

Convert

• XML → JSON Converter: strict validation, namespaces, CDATA, a lossless mode and large files.
• JSON to Types: TypeScript interfaces or types, Zod, Pydantic, dataclasses, Go, Java, Kotlin, Dart and Swift from a sample.
• Data Converter: CSV/TSV, JSON, JSON Lines, YAML, Markdown tables and SQL INSERT statements.
• Encode / Decode: Base64, URL, HTML entities, hex and Unicode.
• LLM Output Cleaner: extract and repair the JSON in a model reply.

Example: types from a JSON sample

Paste a response sample:

{ "id": 42, "email": "ada@example.com", "roles": ["admin"], "profile": { "name": "Ada", "verified": true } }

JSON to Types gives a nested interface for each object:

export interface User {
  id: number;
  email: string;
  roles: string[];
  profile: Profile;
}

export interface Profile {
  name: string;
  verified: boolean;
}

Pick Zod instead and you get schemas that check the data at runtime, including z.number().int() for whole numbers and z.string().email() for an email address:

export const userSchema = z.object({
  id: z.number().int(),
  email: z.string().email(),
  roles: z.array(z.string()),
  profile: profileSchema,
});
export type User = z.infer<typeof userSchema>;

Get started

1. Open the DevSnip Pro sidebar and press Ctrl/Cmd+K to search the tools.
2. Type "json" and pick a tool. Most tools can read the active editor or the selection.
3. Use Copy, Insert at cursor, Open in editor or Save on the result.

Tools in this area

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Questions

Is my JSON sent to a server?

No. The formatter, validators and converters run locally in VS Code, which matters when the data is a production payload or contains tokens.

Can it decode a JWT?

Yes. JWT Decoder & Signer shows the header and payload as formatted JSON, checks the expiry, and verifies or signs test tokens.