JSON CLI tool — tools.voiddo/jsonyo vs jq
Both process JSON from the command line. jq has the most powerful JSON query language available. jsonyo has 18 named commands, converts JSON to YAML/TOML/CSV/XML, generates TypeScript/Go/Python types, and works without learning jq syntax.
tools.voiddo/jsonyo
- 18 commands: validate, format, minify, query, diff, merge, flatten, types…
- Convert JSON ↔ YAML, TOML, CSV, XML
- Generate TypeScript interfaces, Go structs, Python TypedDicts
- Structural JSON diff — shows exactly what changed
- JSON Schema validation with error details
- Batch mode and directory watch
- Works in-browser at tools.voiddo.com/jsonyo
- Zero deps, MIT licensed, Node 14+
jq
- The reference JSON query language — used everywhere in DevOps and shell scripting
- Recursive descent, reduce, label-break, streaming large files
- Regex-like expressive filters: select, map, group_by, paths
- Available as a C binary — no Node.js required
- No format conversion; no type generation
- Steep learning curve for complex expressions
- No browser version
Feature comparison
| Feature | tools.voiddo/jsonyo | jq |
|---|---|---|
| JSON validate | ✓ with schema support | ✓ parse errors only |
| JSON format / pretty-print | ✓ | ✓ |
| JSON minify | ✓ | ✓ (compact flag) |
| Field extraction / query | ✓ jsonpath syntax | ✓ jq DSL — most expressive |
| Filter / select records | ✓ | ✓ — superior |
| Recursive descent | — | ✓ (..) operator |
| Streaming large files | — | ✓ --stream flag |
| JSON → YAML | ✓ | ✗ |
| JSON → TOML | ✓ | ✗ |
| JSON → CSV | ✓ | partial (manual) |
| JSON → XML | ✓ | ✗ |
| Generate TypeScript types | ✓ --lang ts | ✗ |
| Generate Go structs | ✓ --lang go | ✗ |
| Generate Python TypedDicts | ✓ --lang py | ✗ |
| Structural JSON diff | ✓ | ✗ |
| Merge JSON objects | ✓ deep merge | * + operator (shallow) |
| Flatten nested JSON | ✓ | partial (leaf paths) |
| Unflatten to nested JSON | ✓ | ✗ |
| Batch mode / directory watch | ✓ | ✗ |
| In-browser UI | ✓ tools.voiddo.com/jsonyo | ✗ |
| No Node.js required | requires Node 14+ | ✓ C binary |
| Pipe-friendly stdin/stdout | ✓ | ✓ |
| Open source | ✓ MIT | ✓ MIT |
Comparison based on publicly observable behavior as of 2026-05. For complex ad-hoc JSON query expressions in shell scripts, jq remains the reference tool. For conversion, type generation, and structural diffing, jsonyo is the better fit.
FAQ
What can jsonyo do that jq cannot?
jsonyo converts JSON to YAML, TOML, CSV, and XML (and back). It generates TypeScript interfaces, Go structs, and Python TypedDicts from any JSON document. It can diff two JSON files structurally to show exactly what changed. It validates against a JSON Schema with detailed error messages. jq does none of these things — it is a query language, not a conversion or type tool.
Is jq still better for querying and filtering?
Yes. jq's query language is more expressive for ad-hoc filtering:
select, map, reduce, recursive descent (..), streaming (--stream), and label-break are all jq-native. If you are extracting specific fields or doing complex transformations in shell scripts, jq is the reference tool. jsonyo uses jsonpath for queries, which covers most common cases.How do I generate TypeScript types from a JSON file with jsonyo?
Run
jsonyo types myfile.json --lang ts and jsonyo outputs a TypeScript interface inferred from the document's structure. For Go: --lang go. For Python TypedDicts: --lang py. Pipe mode works too: cat data.json | jsonyo types --lang ts.Does jsonyo work in a browser without installing anything?
Yes. tools.voiddo.com/jsonyo offers all 18 commands in a browser UI — no install needed. jq has no official browser version; third-party playgrounds exist but are not maintained by the jq project.
Can I convert JSON to YAML on the command line with jsonyo?
Yes.
jsonyo convert yaml myfile.json outputs YAML. cat data.json | jsonyo convert toml converts stdin to TOML. Supported formats: YAML, TOML, CSV, XML. jq cannot convert to any of these formats natively.When would I use jq instead of jsonyo?
Use jq when you need complex query expressions:
.[] | select(.status == "active") | .name, recursive search with .., reduce for aggregation, or streaming very large JSON files with --stream. jq is also available as a C binary with no runtime dependency — useful in minimal containers where Node.js is not present.Try tools.voiddo/jsonyo
18 JSON commands — validate, format, convert to YAML/TOML/CSV/XML, generate TypeScript types, diff, merge. Browser or CLI. No account. Zero deps.
Competitor names and trademarks belong to their respective owners. This comparison reflects publicly observable tool behavior.