Unable to install express-graphql

Question

I’m trying to install express-graphql but getting this error. Please, help!

npm install --save express-graphql 
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/graphql
npm ERR!   graphql@"^16.2.0" from the root project 
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer graphql@"^14.7.0 || ^15.3.0" from [email protected]
npm ERR! node_modules/express-graphql
npm ERR!   express-graphql@"*" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

Same error. Did you find a solution?

– thelearner

Feb 19, 2022 at 21:46 — Feb 19, 2022 at 21:46

Adriaan 17.7k7 gold badges42 silver badges75 bronze badges · Accepted Answer · 2023-04-24 09:06:34Z

15

Delete the full initialized project then run the following:

npm init -y
npm install express express-graphql
npm install graphql

You should install express-graphql before graphql.

edited Apr 24 at 9:06

Adriaan

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answered Mar 30, 2022 at 16:37

RST Entertainment

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-28 19:59:27Z

6

Uninstall graphql module if it’s present. Then install both of them with one command:

npm install graphql express-graphql

edited Mar 28 at 19:59

Angelina

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answered Aug 30, 2022 at 12:03

Beqa shekiladze

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MIGMIG 311 bronze badge · Accepted Answer · 2022-07-03 18:55:51Z

3

I generated my app using:

npx express-generator <projectName>

and to solve the issue, I just did:

npm un express graphql

which where modules that I had already installed and then ran:

npm i express-graphql graphql express

in that order worked for me.

answered Jul 3, 2022 at 18:55

MIG

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-30 05:20:38Z

2

Delete package.json, package-lock.json, & node_modules.
Initialize npm again.
Now, install express-graphql with npm at first (install before any other package in the app).

These steps solve my problem.

edited Mar 30 at 5:20

Angelina

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answered Mar 10, 2022 at 9:50

Hemant Soni

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-29 00:49:37Z

1

Install in this order:

npm install express-graphql graphql express

edited Mar 29 at 0:49

Angelina

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answered Jan 3 at 9:43

Rupesh

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-30 10:12:29Z

1

If you try to install express-graphql after graphql, it creates the conflict and that errors you see in the console.
According to GraphQL spec, you should use the following modules installation order:

npm install express express-graphql graphql --save

To fix the issues, you should:

Remove graphql
Install express-graphql
Install graphql

edited Mar 30 at 10:12

Angelina

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answered Jan 11 at 18:14

Lotpite

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KarikaalanKarikaalan 445 bronze badges · Accepted Answer · 2022-04-16 12:31:46Z

0

npm install express-graphql --save --force

works for me.

answered Apr 16, 2022 at 12:31

Karikaalan

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Tyler2P 2,32426 gold badges22 silver badges31 bronze badges · Accepted Answer · 2022-12-15 16:03:32Z

0

I installed graphql then express-graphql, then npm i express --force

edited Dec 15, 2022 at 16:03

Tyler2P

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answered Dec 11, 2022 at 23:20

Ayo crescent

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Tyler2P 2,32426 gold badges22 silver badges31 bronze badges · Accepted Answer · 2023-01-22 18:18:57Z

0

STEP 1: Delete package.json, package-lock.json, node_modules and start again.

STEP 2: npm install express express-graphql graphql --save

Apparently installing packages in that order works. Command is copied from GraphQL docs.
https://graphql.org/graphql-js/running-an-express-graphql-server/

edited Jan 22 at 18:18

Tyler2P

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answered Jan 20 at 22:34

Akshay Joshi

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-28 17:19:13Z

0

Install express-graphql before installing express.

edited Mar 28 at 17:19

Angelina

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answered Mar 8, 2022 at 6:37

Amalesh

1

? The OP just failed to install express-graphql, so how he will install before something else ?

– Elikill58

Mar 8, 2022 at 9:06

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-30 13:02:39Z

0

Can you try deleting package-lock.json? It may help as per the github issue.

edited Mar 30 at 13:02

Angelina

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answered Jan 4, 2022 at 7:35

Sajeetharan

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-30 18:55:55Z

0

I deleted package-lock.json and ran

npm install express-graphql graphql --save

It worked for me.

edited Mar 30 at 18:55

Angelina

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answered Jun 23, 2022 at 9:22

Said

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Angelina 1621 silver badge12 bronze badges · Accepted Answer · 2023-03-30 21:02:18Z

0

As stated in the other answers, first remove graphql via:

npm remove graphql

Now install express-graphql with this command:

npm install express-graphql

It works for me.

edited Mar 30 at 21:02

Angelina

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answered Sep 28, 2022 at 14:41

Gajen Dissanayake

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DanyJerezDanyJerez 1 · Accepted Answer · 2023-08-13 06:38:10Z

0

install express-graphql with yarn

install yarn npm install --global yarn
install dependencieyarn add express-graphql
be happy!

answered 1 hour ago

DanyJerez

1

New contributor

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Unable to install express-graphql