jop

Building Private & Local-first dev tools
Founder of TypeMorph (160+ offline tools)

[jop @jopnuk9]

@___bv_

[jop @jopnuk9]

@SantoshYadavDev Zod is definitely the gold standard.
The manual work of creating schemas from real JSON is what slows me down the most.
Been testing field-name based inference that adds proper validators (urls, emails, dates etc.). Huge time saver.

[jop @jopnuk9]

@colinhacks z.fromJSONSchema() looks super useful.
Converting the other way (real JSON → good Zod) is still painful — everything becomes z.string().
Been testing field name inference that adds proper validators (email, url, datetime, etc.). Makes real API payloads way better.

[jop @jopnuk9]

Most Zod schemas compile fine.
They also validate almost nothing.
z.string() for email. z.number() for age with no bounds.
"id" that accepts any string.
Technically valid. Practically useless.

[jop @jopnuk9]

Same Live API JSON.
json-to-zod → 0 real validators
TypeMorph → 103 real validators
Not just z.string().
Real types from actual data:
54 z.url() · 34 https://t.co/Sawdd8oqCK() · 8 datetime · 3 https://t.co/eWwI31DNHe() · 4 ranges
⁠#TypeScript ⁠#buildinpublic

[jop @jopnuk9]

Every JSON→Zod tool writes Zod.
TypeMorph also reads it.
Zod schema → TypeScript, JSON Schema, OpenAPI, or mock data. 100% local.
#buildinpublic #indiehackers

[jop @jopnuk9]

Same JSON. Two Zod converters.

－json-to-zod sees strings.

－TypeMorph sees intent.

－The inference is the moat.
#buildinpublic

[jop @jopnuk9]

⁠ Piped GitHub’s API directly into TypeMorph:
$ curl https://t.co/FPKl6JXSoE | typemorph zod –root GitHubUser
URL templates, literals, integers — inferred automatically. Zero config. 100% local.
#TypeScript ⁠ #buildinpublic #SaaS

[jop @jopnuk9]

Graded 3,146 schemas from Stripe, OpenAI, and GitHub.

Stripe A:62% B:37% F:0%
OpenAI A:52% B:48% F:0%
GitHub A:50% B:49% F:0%

Big tech writes clean schemas. Does yours?

typemorph quality openapi.yaml
#buildinpublic

[jop @jopnuk9]

Fetched the GitHub API and piped it straight into TypeMorph

avatar_url → z.url()
node_id → z.uuid()
created_at → z.iso.datetime()
type → z.enum(["User"])

No config. It reads the field names.

npx typemorph-cli zod schema.json
#buildinpublic

[jop @jopnuk9]

Stress-tested TypeMorph against real-world OpenAPI specs.
Stripe API (7.5MB, 1,544 schemas) → TypeScript in 185ms GitHub REST (12MB, 3,038 schemas) → TypeScript in 337ms
Zero crashes. Zero any[] in Stripe output.
⁠#buildinpublic

[jop @jopnuk9]

TypeMorph auto-generates Zod validators from field names

email → .email()
age → .int().min(0).max(150)
latitude → .min(-90).max(90)
score → .min(0).max(100)

Paste JSON. Get production-ready Zod. 100% in your browser.
#buildinpublic

[jop @jopnuk9]

Schema tooling is so underrated. Most people only think about it when something breaks in prod.

[Simon Willison @simonw]

I've added schema support to my LLM Python library and a CLI tool: you can now provide a JSON schema - or a new concise schema DSL - and supported models will return data matching that format

[jop @jopnuk9]

z.fromJSONSchema() is the one I’ve been waiting for. Having both directions covered makes Zod much more usable as a single source of truth.

[colinhacks @colinhacks]

New year, new Zod — v4.3 is now available!

💎 z.xor()
💎 z.looseRecord()
💎 .exactOptional()
💎 z.string().slugify()
💎 z.meta() / z.describe()
💎 type narrowing in .refine()
💎 z.fromJSONSchema()

[jop @jopnuk9]

The reverse direction is just as painful — you have sample JSON but no spec, so you’re hand-typing Zod schemas from trial-and-error.

[Evil Martians @evilmartians]

You’re still hand-writing API types in 2026? Your OpenAPI spec can generate TypeScript types, API clients, Zod schemas, and network-level mocks — so you ship features before backend deploys anything. @yurimikhin walks through the full setup with Hey API, Nanostores, and MSW.

https://t.co/SNDno85RHS

[jop @jopnuk9]

Do you ever paste company JSON into a random online converter and immediately feel uneasy?
I did. So I built one that runs 100% in your browser.
No servers. No uploads. Your data never leaves your machine.
→ https://t.co/Qqda9U3Nn2

[NASA @NASA]

Coming soon: one of history’s most complex missions

Tune in on Tuesday, June 9, at 11am ET, to meet the astronauts flying aboard Artemis III, the mission that will test docking capabilities with commercial landers in low Earth orbit — an important step to crewed lunar landings.

[jop @jopnuk9]

Zod/datetime generation improvement🚀
The generation accuracy has been strengthened.
Zod output with z.string().datetime()
Fixed values are typed like z.enum(["USD"])
This will increase the reliability of type generation.
#TypeScript ⁠#buildinpublic

[jop @jopnuk9]

I compared JSON type generation tools.
The results were pretty clear 👇
⁠#TypeScript ⁠#buildinpublic

[Cloudflare Developers @CloudflareDev]

We're partnering with @xai to bring Grok to @Cloudflare AI Gateway.
• Grok LLMs, audio, image, and video models are now available through AI Gateway
• Billed directly through Cloudflare
• No additional auth, env, API keys needed

𝚎𝚗𝚟.𝙰𝙸.𝚛𝚞𝚗("𝚡𝚊𝚒/𝚐𝚛𝚘𝚔-𝚒𝚖𝚊𝚐𝚒𝚗𝚎-𝚟𝚒𝚍𝚎𝚘-𝟷.𝟻-𝚙𝚛𝚎𝚟𝚒𝚎𝚠")